HQ -180SERIES

MAM-2

COMMUNICATIONSRECEIVERS

ji?

TICHNICALDISCRIPTIONAND°PIRATINGINSTRUCTIONS

0I

HAMMARLUND MANUFACTURING COMPANY, INC.A Giannini Scientific Co.73-88 Hammarlund Drive, Mars Hill, North CarolinaExport Department: 13 East 40th Street, New York 16, N. Y.

52187-1

In order that the Hammarlund Manufacturing Company maymore effectively process customer complaints and warranty, aswell as non -warranty repairs and modifications, a CustomerService Group has been established at our factory, located inMars Hill, North Carolina.

The scope of this group will include all direct correspondencewith the customer and with warranty repair stations, jobbers andrepresentatives. It will also include factory repair facilities.

As you can see, this is a true "service" organization, inter-ested only in satisfying the customer.

to:In the future, please address all correspondence of this nature

Hammarlund Manufacturing CompanyMars Hill, North Carolina

Attention: Customer Service

THE HQ -180 AND 180-ASERIES OF COMMUNICATIONS

RECEIVERS

4)

THE HAMMARLUND 180 AND 180-A SERIES OFCOMMUNICATIONS RECEIVERS

CONTENTS OF INSTRUCTION AND SERVICE MANUAL

Specifications Page 3

Circuit Description Page 6

Installation Page 9

Operation Page 17

Service and Maintenance Page 24

Removing and Replacing Page 35The Chassis

Removing and Replacing Page 37The Front Panel

Alignment Procedure Page 45

Tube Socket Voltages Pages 58,60,62,64

Tube Socket Resistances Pages 59,61,63,65

Parts List Page 66

Schematic Diagram Page 76

HQ -180 AND 180-"A" SERFS SPECIFICATIONS

Frequency Range Covered:.54-1.05mc/s; 1.05-2.05 mc/s; 2.05-4.04mc/s; 4.0-7.85 mc/s; 7.85-15.35 mc/s;15.35-30.Q mc/s.

Bandspread Calibration:Dial markings every 5 kc/s on 15, 20, 40and 80 meter bands; every 10 kc/s on 10meter band; plus arbitrary 0-100 loggingscale.

Maximum Audio Output:1.0 Watt (Undistorted)

Passband Tuning Range:plus/minus 3 KCS with calibration every 1KC. 8:1 vernier tuning ratio.

Output impedance:3.2 Ohms (E1A Standard) plus 500 Ohms.

AVC Action:Operates on RF and 3 1F stages. Providesfast charge --adjustable discharge smoothacting AVC. Delayed AVC applied to the RFstage. Better than . 001 second attack timeand .01- .1-1 second decay time. Offposition.

Adjustable Selectivity and Selectable Side -bands:6 db bandwidths "Upper sideband--1-2-3 kcsLower sideband--1-2-3 kcs Both sidebands--.5-2-4-6 kcs

Sensitivity:An average of 1.5 microvolts produces 10:1signal-to-noise ratio on AM approximately.7 uv on CW and SSB.

Antenna Input:50 to 600 ohms; balanced or unbalanced.

Antenna Compensator:Permits compensation for loading effects ofvarious type antennas, or balanced trans-mission line.

Beat Frequency Oscillator:Variable from zero beat plus/minus 2 kcsplus fixed position for SSB.

Slot Filter:Range plus/minus 5 kcs of center frequency.Attenuation over plus/minus 5 kcs rangeprovides over 40 db. Calibrations every1 kc. Maximum attenuation using slotdepth control is 60 db. 8:1 vernier tuningratio.

Tube Complement:6BZ6 RF Amplifier6BE6 1st Converter6C4 HF Oscillator6BE6 2nd Mixer -Crystal Osc.6BA6 455 kc Gate6BA6 455 kc 1F Amp.6BE6 3rd Mixer -Variable Osc.6BA6 60 kc 1F Amp.6BA6 60 kc 1F Amp.6BV8 60 kc 1F amp. AVC-AM Det12AU7 SSB Product Detector6AL5 Noise Limiter12AU7 BF0-"S" Meter Amplifier6AV6 1st A F Amp. - Delayed AVC

Clamp6AQ5 Audio Power Output0A2 Voltage Regulator6BZ6 Crystal Calibrator6CW4 Crystal Oscillator

Semiconductor Complement:Rectifier --Two 800 P.I.V. at 1/2 amp.

Power Supply:105-125 Volts 50-60 cps. a. c. power con-sumption. 120 watts.

"S" Meter:Calibrated 1 to 9 in steps approximately6 db. Also includes db scale, above 5-9to plus 40 db. (Meter deflects on all typesof signals.)

Noise Limiter:Adjustable series type provides bothpositive and negative clipping.

3

Front Panel Equipment:Main TuningBandspread TuningVernier or Bandpass TuningSensitivity (RF Gain):

on/off switchSelectivity: 0.5-1-2-3 Kcs.

(per sideband)Sideband: Upper -lower -bothAudio GainAntenna CompensatorTuning Range (Band Selector)Function Switch: AM-SSB-CWSlot Freq. Calib.CW Tone (BFO Pitch)Noise Limiter, adjustable

-on/off switchAVC, off -slow -medium -fastSend -Receive -CalibratePhone Jack"S" MeterDial Scale reset

Rear Panel Equipment:Terminals for speaker connections

3.2 ohm for voice coil500 ohm for line or VOX

Accessory socket for preamp, Q -multi-plier or converter. System socket forsimplified associated transmitter/receivercontrol.

S -meter controls.

Antenna input terminals plus 50239.

Dimensions:10-1/2" H x 19" W x 13" DWt. 38 lbs.Shipping Wt. 45 lbs.

HQ-180AXUniversal model of the HQ -180A receiverwith provisions for 11 fixed -frequencycrystal controlled channels. Six of thecrystals are easily interchangeable fromthe front panel --the balance are locatedwithin the cabinet but are readily accessiblefrom the trap-door top. 3 kc vernier tun-ing control permits compensation for minorfrequency variations of the crystals.

24 HOUR CLOCK -TIMER

Combination clock and automatic timer.Aids in meeting prearranged schedules.Optional extra.

4

IF AMPLIFIER The 3035 KCS and 455 KCSIF amplifiers provide eight tuned circuits inthree stages of amplification. Six tunedcircuits in the three -stage 60 KCS amplifierprovide either the second or third conversion,depending upon the operating band. All IF cir-cuits employ iron -core permeability -tunedtransformers for the high performance andretention of alignment accuracy. The 60 KCSamplifier selectivity is controlled from thefront panel by seven positions: 1-2-3 KCS oneither sideband, and .5-2-4-6 KCS on both side -bands. The skirt selectivity of this system ap-proaches that of the mechanical filter. A separatefront panel switch is used to select upper, lower,or both sidebands, providing rapid, simple meansof sideband selection.

SLOT FILTER The slot filter provides anotch of better than 60 db attenuation over theentire range off 5 KCS from the center IF(455 KCS) frequency. The slot filter controlprovides 40 db attenuation, plus an additionalattenuation of up to 20 db obtainable by use ofthe slot depth control at a particular frequency.The 6 db width of the slot is approximately 1.5

KCS. Accurate frequency adjustment of the slotis obtained by means of an 8:1 vernier control.The slot filter circuit consists of a Bifilar "T"trap.

SEPARATE VERNIER TUNING 4 3 KCSvernier tuning allows extra -fine passbandtuning between the 455 KCS IF and the 60KCS IF for additional selectivity and easytuning of the desired signal.

AVC An extremely fast -attack delayed AVCcircuit is employed. A four position controlon the front panel permits the selection ofOFF-AVC or SLOW -MEDIUM -FAST AVCdecay time for optimum results on varioussignals. The AVC is taken from the highselectivity 60 KCS IF.

S -METER Readings of signal strengthand "on -the -point" tuning indications areprovided on all types of signals by a high-response S meter circuit. The scale iscalibrated to 40 db over S-9 and is factory -calibrated so a signal of approximately 50microvolts reads S-9. Each S -unit indi-cates approximately a 6 db increase,equivalent to doubling the signal strength.S -meter is extremely effective on SSB andCW when using slow decay AVC.

AUDIO The HQ -180A features the ex-clusive Hammarlund Auto -Response whichautomatically adjusts the audio passbandto best meet the receiving conditions. A(6AQ5) provides 1.0 watt for maximumundistorted output. The Auto -Responsecircuit employs controlled feedback whichis decreased as the gain control is turnedup, thus narrowing the audio passband.As the gain is decreased, the feedbackincreases, thus permitting a greater fre-quency response in the audio output. Theresult is crisper, easier to read sound onweaker signals, and broader, more real-istic reproduction on stronger signals.

The audio output may be used witheither earphones or loudspeaker. Thephone plug automatically silences thespeaker upon insertion. The Audio -Re-sponse permits tops in listening pleasureof AM, SSB, and CW reception.

5

HQ -180A DESCRIPTION

Starting with the front panel layout, the care-ful selection of high -reliability components,the craftsmanship of skilled technicians, andthe addition of engineering leadership resultin a receiver worthy of the Hammarlund namein quality and performance.

The HQ -180A offers the listener a prac-tically endless combination of tuning techniqueswhereby reception of SSB/CW and AM/MCWmay be achieved. Through the use of thevernier tuning, adjustable bandwidth, and thebasic, precision front-end of the HQ -180Athe user has full control over SSB signals aswell as adjacent, or co -channel signals. Ifthere's a signal to be received, the HQ -180Acan ferret it out...

The HQ -180A is a "hot" receiver. It willprovide 10 db signal-to-noise ratio at 1.5uvolt AM or approximately .5 uvolt CW, orbetter depending on bandwidth. The front endprovides continuous tuning .54 mc/s to 30mc/s. The receiver is designed for use witha single wire flat top, a folded dipole, ordoublet antenna.

CIRCUITRY The HQ -180 is an eighteentube triple conversion superheterodyne re-ceiver (double conversion, .54 to 7.85megacycles) that has been designed to providethe best possible performance for receptionof AM, SSB and CW signals. The most impor-tant performance characteristics of a com-munications receiver have been made adjust-able by means of the front panel knobs.

The RF tuning system covers the follow-ing bands:

.54 to1.05 to2.05 to4.0 to7.85 to15.35 to

MAIN TUNING DIAL

1.05 mc.2.05 mc.4.04 mc.7.85 mc.

15.35 mc.30.0 mc.

.. cal in 10 kc

..cal in 10 kc

..cal in 20 kc

.. cal in 50 kc

..cal in 100 kc

..cal in 100 kc

divs.divs.divs.divs.divs.divs.

BAND SPREAD TUNING DIAL

Arbitrary scale3.44 to 4.0406.810 to 7.3

13.980 to 14.42520.925 to 21.6027.890 to 29.7

nac.nac.nac.nac.nac.

0 to 100 divs..cal in 5 kc divs..cal in 5 kc divs..cal in 5 kc divs.. cal in 5 kc divs..cal in 10 kc divs.

A built-in 100 kcs crystal calibratorprovides marker signals at every 100 kcson all bands for checking dial calibrationaccuracy.

The dial calibration reset knob enablesyou to adjust the frequency calibration toapproach frequency meter standards oneach amateur band.

Starting at the front-end, the HQ -180Autilizes a (68Z6) tuned RF amplifier anda separate mixer (6BE6) and oscillator(6C4) for a high degree of stabR ity. Ad-vanced design and modern tube typesaccount for the very high gain and lownoise factor. Refer to page one for com-plete listing of the many possible functionsand the complete tube lineup.

Low -loss, coil forms, and bandswitchwafers, plus temperature -c ompe ns atingcapacitors, and the application of regula-ted power to the oscillator circuit providea high degree of stability.

TRIPLE CONVERSION The HQ -180Aoffers triple conversion with IF frequen-cies of 3035 KCS, 455 KCS, and 60 KCS,providing excellent rejection of image -response. The second IF is heterodynedwith a crystal -controlled oscillator. Thethird IF is heterodyned with a high sta-bility, adjustable oscillator which containsmicro -accurate vernier tuning control,located on the front panel.

6

The HQ -180A Series differs from the 180 Series in the following respects:

1. The power supply is designed for 115/230 v. 50, 60 cycle AC opera-tion. This applies to the power transformer T-30 and the new filament trans-former T22.

2. A separate filament transformer is employed, T-22 in the schematicdiagram. This transformer provides 24 hour a day operation of the heaters ofthe high frequency oscillator and first converter, to reduce initial warm up drift.In addition, this transformer also supplies the systems socket which is a newadded feature. If the receiver is not to be operated for long periods (upwardsof 3 days) the line cord should be removed from the socket.

3. A new accessory socket plus a systems socket has been added. Theaccessory socket may be used to power most 6 and 2 meter converters. Thesystems socket will be found convenient when the HQ-180AX series of receiveris employed in conjunction with a transmitter since all of the necessary VOXanti trip and/or relay connections are available from this socket. This also pro-vides a rapid disconnect without the need of tools once the installation has beencompleted properly. A Coordination Cable is available for use with the HQ -180Aor HQ -170A series of receivers designed primarily for use with the HX-50Hammarlund transmitter but useable with other transmitters as well. This ispart #PL39286-G1 at $8. 50.

4. A new three (3) position BFO switch is provided enabling the BFO tobe in the off position, SSB, where the BFO is fixed for optimum SSB audioresponse with reference to the passband. The CW position enables the BFO tobe adjusted plus or minus 2 KC thus providing the usual pitch control adjustment.For CW reception, the BFO should always be set plus or minus 500 cycles to1000 cycles especially in the .5 KC selectivity position so as to prevent detuningof the desired signal for the desired pitch.

5. 3.2 ohms and 500 ohms output terminations are now provided for voicecoil or line operation. The 500 ohm line termination will be found very advan-tageous for phone patch and improved anti trip operation of most VOX circuits.

6. The 5U4G tube formerly used in the HQ -180 has now been replacedwith two (2) silicon diode rectifiers thus providing cooler operation and betterregulation from the power supply.

7. The HQ-180AX series of receivers provides an 11 position fixed fre-quency crystal oscillator assembly which is factory installed in the panel spaceprovided for the 24 hour clock timer. The knob on this assembly allows selec-tion of normal variable frequency tuning or any one of eleven fixed frequenciescrystal controlled. Six crystals are mounted on the front plate of the oscillatorassembly and may be changed quite readily to shift frequency. The remaining

5 crystals are mounted behind the front panel on the oscillator box and may bechanged by lifting the top cover of the cabinet. It is intended that the five insidecrystals will be for commonly used channels not subject to being changed veryoften. The receiver can be zeroed into the channel frequency by manipulatingthe vernier tuning control on the front panel. This will correct for frequencydiscrepancy due to crystal tolerance and assure accurate "netting".

The use of the crystal controlled oscillator will permit the highly stablereception of signals on the eleven channels selected. The only operation re-quired beside turning the selector switch to the desired crystal position is toturn the band switch to the required position and tune the main dial to the ap-proximate frequency rocking the knob finally for maximum "S" meter indication.

In order to ensure proper operation the crystals should be ordered fromyour local authorized Hammarlund distributor.

The oscillator or actual crystal frequency for a given signal frequencyshall be determined from the following:

SIGNAL FREQUENCYRANGE mc

ADD IFFREQUENCY mc

SUBTRACT IF- MODE OFFREQUENCY mc OPERATION

.54 to 1.05 mc .455000 Fundamental1.05 to 2.05 mc .455000 Fundamental2.05 to 4. mc .455000 Fundamental4.0 to 7.85 mc .455000 Fundamental7.85 to 15.35 mc 3.035 Fundamental

15.35 to 20.662 mc 3.035 Fundamental20.662 to 30.000 me 3.035 2nd Harmonic

NOTE: WHERE LOW SIDE INJECTION IS SPECIFIED, HIGH SIDE INJECTIONMAY BE USED AT REDUCED SENSITIVITY.

8

HQ -180A INSTALLATION

Your Hammarlund Receiver is designed to give you the very best results.A few minutes to be sure it is installed correctly is worth while. Even though wehave developed the most sensitive circuitry to select and amplify the signal youwant to hear, remember that it can work only on the RF you feed it from yourantenna. It is to obtain the most satisfaction in its operation that we urge you toput up the best antenna system you can. The HQ -180A will work very well witha temporary wire strung out of a window, but only use this method while con-structing or having constructed a proper antenna system. Finally, a good ground,serves many purposes; one, it eliminates tendencies towards AC hum pickup,often straying through homes or apartments; two, it minimizes atmospheric andman-made noise; three, it ensures a safe path for any voltage coming from apossible short or from an associated transmitter. When using an outside antenna,it is always best to install a lightning arrestor. Such a device drains off theatmospheric charge in a safe manner, protecting you, and the Receiver.

Note that all of the Receiver connections are at the rear of the set, andthat there are a variety of very useful terminal points, permitting a number ofimportant system connections to be permanently attached in a neat manner. Theillustrations belOw show you all of them, allowing you full freedom to use thosethat are most useful to you, whether you are only listening or are operating witha transmitter. The Accessory and System sockets, are all for special applica-tions associated with reception, but not necessary for ordinary operation. Thespeaker and antenna connections are required in any case.

ANTMETER ADJe e

SENS ZERO0

ANT

OM

SPKR. FUSE3.2 OHMS (-)

0 0eee00

F9EX T

RELAY0

HQ -180 SERIES

ACCESS SOCB+ METER ADJ

9 9FIL GND

SENS ZERO

ANT0 000 0

0

ANT

0 ODD 0 0SPEAKER

0 9 0 0G 3.2a 500.n.

FUSE

0

9 SYSTEM SOC

HQ- 180A SERIES

RECEIVER REAR CONNECTIONS

9

Connect a suitable 3.2 -ohm loudspeaker to the 3. 2 -ohm terminal screwsas shown in the diagram. Use a Hammarlund S-200 Speaker for best results,but any equivalent speaker in a cabinet will operate satisfactorily. Do not placethe speaker cabinet on top of the Receiver, because the HQ -180A is a very sen-sitive set, and speaker vibration can cause regenerative oscillation electroni-cally, impairing reception. Note that a jack is provided in the lower left cornerof the front of the Receiver for headphone plug insertion. The 1 oudspeaker isautomatically disconnected when the phone plug is inserted.

HEADPHONES

High impedance magnetic phones will usually be found satisfactory wherthe headphone jack is employed. The phones are deliberately mismatched toreduce the level into them. If more level or volume is desirable, low impedancephones may be employed. These may be any of the popular impedances such as8, 16 or 24 ohms. If you do not have headphones and desire to purchase a pair,the low impedance type is suggested since it will always be possible to reducethe volume by making use of the audio volume control.

Another alternative, if high impedance phones are available, is to perman-ently connect these to the 500 ohm line output terminals on the rear of the re-ceiver. These wi 1 provide more volume than the headphone jack since the head-phone jack impedance is 3.2 ohms or the same as the speaker. ("A" Series only.)

3.20.SPEAKER

CONNECTION

5000.LINE

CONNECTION

GND 3.211 50011

GND 3.201 50011

o es

3.2n SPEAKER 8 500n LINECONNECTIONS

TO SPEAKER

TO LINE

- 10 -

The Receiver connections for the antenna and ground are clearly illus-

trated on these pages, and a few hints are given for antenna installation, but

the HQ -180A owner is urged to read a good antenna book to select the best

type for his purpose. The Amateur Radio Relay League publishes this type

of information. Its Antenna Book provides all you need to know about antennas

for both reception and transmission. Other publishers produce equivalent

books on this subject.

After selecting the antenna desired, consult the diagrams in this Manual

to make the proper connections to the receiver. Following are some tips on

antenna system selection and installation.

Either a single -wire or a balanced antenna may be used with the HQ -180A.

The front panel antenna trimmer control is designed to permit a good match

to almost all antenna systems of 50 to 600 ohms, balanced or unbalanced. The

coaxial connector is intended to be used for 50 -ohms types, the terminal strip

for up to 300 ohms. While general coverage can be obtained from a short wire

of 20 to 50 feet, much improved reception will be developed from an outdoor

single -wire system of 50 to 150 feet in length. It is recommended that the

antenna be isolated as much as possible from near -by objects, buildings, trees,

etc., and that it be located at right angles to power lines or busy highways.

This will minimize interference pickup from the lines or from passing vehicles.

-in50- I 5 0 FEET -10

SINGLE WIRE ANTENNA

4- I /2 WAVE

4- I/4 -10 4- I /4 -1110.

1/2 WAVE LENGTH468

FREQ (MCS)

50 OHMCOAXIALCABLE

COAX PLUG

DIPOLEANTENNA

LUGS

75 OHMTWIN LEAD(USE 300 OHMTWIN LEAD FORFOLDED DIPOLE)

The first antenna connection illustration shows the simplest system.This arrangement provides good overall coverage, but if a particular band is.intended to be used consistantly, the use of a dipole tuned to that band is recom-mended. The illustrations show how such an antenna is made and what Receiverconnections are necessary. For all antennas, the shielded or twin -lead methodsare a decided improvement over the single wire to minimize man-made inter-ference and noise signals. In especially noisy areas, this may be the only wayto develop an acceptable signal.

Each of the antenna connection schemes require very little wiring com-plications or soldering technique. For those familiar with soldering, no troublewill appear. For those who have never soldered, it is recommended that somepractice be obtained before attaching a plug to a shielded cable. However, theexperience gained from work on even one hi -fit kit or radio is ample for thiswork. For convenience, some simple instructions in plug and cable installationare included in this book. Remember not to apply too much heat, just enough toallow solder flow. Excess heat will melt some plastic insulations, possiblycausing a short between the center conductor and the shield.

TOSINGLE -WIRE

ANTENNA

AA

0

0G

MOUNT ARRESTOR

OUTSIDE OFHOUSE IF

POSSIBLE

TO RECEIVERANTENNA 8

GROUND CONNECTIONS

LIGHTNING ARRESTOR(SINGLE TYPE)

CLAMF

STAKE IN GROUNDOR WATER PIPE INCELLAR

TODIPOLE

ANTENNA

AOGO AO

.*/

TO

RECEIVERANTENNA

AND

GROUNDCONNECTIONS

LIGHTNING ARRESTOR(DUAL TYPE)

STAKE IN GROUNDOR WATER PIPE 1NCELLAR

TYPICAL LIGHTNING ARRESTOR INSTALLATIONS

- 13 -

FORSINGLE- WIRE

ANTENNASYSTEM TO GOOD

EXTERNALGROUND

LINKCLOSED

* INTERNAL CONNECTION

ANTENNA CONNECTIONS FOR SINGLE WIRE

ANTENNA

COAXIAL CABLE TWIN LEADFOR 50 -OHM FOR DIPOLEANTENNA ANTENNA

CONNECTION

TO GOODEXTERNALGROUND

NOTE: WHEN COAX ISUSED LINK MUST BECLOSED BETWEEN A& G. THIS LINK IS ONLYOPEN WHEN TWIN LEADOR BALANCE ANTENNAIS EMPLOYED.

ANTENNA CONNECTIONS FOR DIPOLE

ANTENNA

b

SOLDER

I STRIP INSULATION.2 CUT AND SPREAD SHIELD.

3. INSERT CABLE INTO PLUG,CENTER CONDUCTOR THRU

-.Ir --4 8

PIN. SOLDER CENTER

k- CONDUCTOR, CUT OFFEXCESS.

SOLDER

LCUT OFFWIRE END

4 SOLDER SHIELD AROUNDOUTER NECK OF BODY.

CAUTION DO NOT USE TOOMUCH HEAT, CENTERCONDUCTOR INSULATIONMELTS EASILY!

ATTACHING SHIELDED CABLE TO PHONO TYPE

CONNECTOR

ASSEMBLY OF CABLES TO 83-ISP PLUG USING ADAPTER 83-168 OR 83-185

CUT END OF CABLE EVEN. REMOVE VINYL JACKET 3/4,SLIDE COUPLING RING AND ADAPTER ON CABLE .

FAN BRAID SLIGHTLY AND FOLD BACK AS SHOWN.

POSITION ADAPTER TO DIMENSION SHOWN. PRESSBRAID DOWN OVER BODY OF ADAPTER AND TRIM TO 3/8!'

1-140141_ BARE 5/8" OF CONDUCTOR. TIN EXPOSED CENTER CONDUCTOR.

8 5_8

SCREW PLUG SUB -ASSEMBLY ON ADAPTER. SOLDER BRAID TOSHELL THROUGH SOLDER HOLES. USE ENOUGH HEAT TOCREATE BOND OF BRAID TO SHELL. SOLDER CONDUCTOR TO CONTACT.,

-w-,fimr FOR FINAL ASSEMBLY, SCREW COUPLING RING ON PLUG- SUB- ASSEMBLY.

ASSEMBLY OF CABLES TO 83-ISP PLUG

CUT END OF CABLE EVEN. REMOVE VINYL JACKET I18."

14- 11-01'1°1141 BARE 5/8 OF CENTER CONDUCTOR. TRIM BRAIDED SHIELD

SLIDE COUPLING RING ON CABLE. TIN EXPOSED CENTERCONDUCTOR AND BRAID.

SCREW THE PLUG SUB -ASSEMBLY ON CABLE. SOLDERASSEMBLY TO BRAID THROUGH SOLDER HOLES. USE ENOUGHHEAT TO CREATE BOND OF BRAID TO SHELL. SOLDER CENTERCONDUCTOR TO CONTACT.

FOR FINAL ASSEMBLY SCREW COUPLING RING ON PLUGSUB -ASSEMBLY.

Using 6 and 2 meter converters with the HQ -180 and "A" series receivers

When building or purchasing a converter for 6 or 2 meters, we recommendusing an IF frequency of 10.0 to 14.0 me/s. In the "A" series of receivers theaccessory socket may be used for convenience in supplying power to the converter.Consult the Accessory Socket Connections Diagram for the proper plug wiring.

VIEW FROM WIRINGSIDE OF SOCKET, ORFROM PIN END OF PLUG.

B+

SWITCHED6.3 VACFOR FIL.

GROUND

ACCESSORY SOCKET CONNECTIONSThe system socket connections provide for a variety of uses, depending

upon the transmitter system installed. (Compatibility with Hammarlund HX-50or HX-500 Transmitters included. See their instruction manuals for details).

VIEW FROM WIRINGSIDE OF SOCKET, ORFROM PIN END OF PLUG.

* ALWAYS ON IFRECEIVERPLUGGED INTOLIVE POWER.

6 3 VACFROM RECEIVER*

500.n.

RECEIVER GRIDBLOCK BIAS

MUTING RELAYo CONTACTS

500n.1GND.

SPEAKER ORLINE CONN.

SYSTEM SOCKET CONNECTIONS

"A" SERIES ONLY

- 16 -

HQ -180A OPERATION

With the antenna, speaker and any accessories installed, you are readyto receive transmissions on the amateur bands. These pages are intended toshow you the operating methods that will permit the Receiver to give you thebest audible signal possible, considering atmospherics and man-made noise.Three most important reminders:

1. Check the listening aids like the noise limiter and slotfrequency control -- be sure incorrect setting is notreducing Receiver capability.

2. Always tune the Receiver properly to produce the maxi-mum signal.

3. Don't forget the antenna trimmer -- it requires a differentsetting on each band. This is because antenna impedancechanges with frequency; the trimmer is there to allow fora maximum match at all frequencies.

Plug the Receiver line cord into a 117 -volt, 60 -cycle line (the exportmodel HQ -180A -E will accommodate 117 or 230 volts, 50 or 60 cycles). Turnthe Receiver on, using the RF gain control and the clock timer switch if in-stalled. Check that all tubes are lit. Note that the high -frequency oscillatorand mixer tube filaments remain heated at all times, (in the HQ -180A series)if the line cord is left inserted into a source of AC power. Heating of thesetubes eliminate drift that occurs in all oscillator circuits as they heat up.Tube life is not reduced through continuous operation. In fact, its life is oftenextended to many times normal because it is not subjected to the hardships ofphysical expansion and contraction due to heating and cooling when power isapplied and removed. If the receiver is not to be used for extended periods(upwards of 3 days) the line cord should be removed from the power socket.If the oscillator has not been maintained heated, then allow one hour for theReceiver to settle down to a steady tuned condition. Readjust tuning as neces-sary during this period. Do not attempt to calibrate or set the S -meter untildrifting has stopped.

The HQ -180 and "A" Series Receiver is arranged to provide the bestreception for AM (voice), for Code (modulated or unmodulated CW), and forSSB (single sideband) operation. To be sure of the best results and theclearest reception, read all of the instructions presented here. Set the con-trols as shown in each illustration for normal operation, and follow the guide-lines to improve performance and to tune over the bands. Become familiarwith each control and see what each can do for you. Even after you are familiarin every way with the controls, refer occasionally to these instructions tocheck that you are still getting the most out of the many features of the HQ -180A.

Finally, your particular location and installation will affect operation;experiment with control settings to obtain the best results. And consult withus if there are any problems. The Receiver is for your enjoyment, use itcorrectly and it will give you years of service.

- 17 -

The Carrier Level S -meter has been adjusted at the factory for correctand calibrated operation, however, two zero adjustments should be checked andreset if necessary; one is mechanical, the other, electrical.

1. With the Receiver turned off, adjust the meter pointer screwon the front face of the meter to set the needle exactly overthe zero mark on the scale.

2. Turn on the Receiver; be sure to allow a 1/2 hour warm-upbefore proceeding further. Eat the HQ -180A to "Receive",and set the RF Gain control fully counterclockwise, withoutactually turning the set off.

3. Now adjust the meter zero control at the rear of the Receiverchassis again for zero on the meter. A small screwdriverinserted through the chassis is required for this setting. DoNOT adjust the meter sensitivity, this requires a specialtechnique and an i n put signal generator, not normally avail-able for home use. Check carefully with the rear of chassisillustration to be sure of the location of the meter zero adjust.

HOW TO USE THE BAND SPREAD DIAL

The main dial is provided with markers, just below the scales at 4.04,7.3, 14.425, 21.6 artd 29.7 mcs, to establish points for the approximate set-tings of the main dial when using the band spread scales.

Please remember that we do not claim frequency meter accuracy; alsothat the high frequency markers, mentioned above, are approximate settingsof the main dial to be used in setting up the amateur scales of the band spreaddial.

Set the band spread dial at the 100 kcs point at, or nearest to, the highfrequency end of the desired amateur band. The main dial should then becarefully adjusted, close to the high frequency band edge marker, to obtainzero beat with the 100 kcs calibrator. Care must be taken that the proper100 kcs point is employed in order to prevent setting the main dial 100 kcshigher or lower than the amateur band. Next turn the band spread dial to the100 kcs marker nearest the desired operating frequency. It may be found thatthis 100 kcs marker is slightly off the exact dial marker. The dial indicatoris set to the exact 100 kcs marker, with the small knob to the right of theband spread dial.

If it is desired to use the band spread dial for other, limited frequencyranges than those for which scales are provided, set the band spread dial atthe 100 marker of 0 to 100 arbitrary scale and adjust the main dial for zerobeat at the highest 100 kcs marker of the desired range. The frequencycoverage of the band spread, under this condition, can be determined bycounting the 100 kcs intervals covered and by noting the arbitrary scalereadings at which they occur, the wanted frequencies can be identified andlogged for future use.

- 18 -

GENERAL OPERATING PROCEDURE (ANY MODE)

1. Select mode -- AM, SSB, CW.

2. Set controls for normal operation as shown on the mode illustration --AVC, RECEIVE, SIDEBANDS, SELECT KCS NOISE LIMITER off,SLOT FREQ -A 5 KCS, BFO centered, VERNIER TUNING zero.

3. Tune in station -- TUNING RANGE, MAIN TUNING, AF and RF GAIN,ANTENNA TRIMMER -- use BAND SPREAD for bandspread, andVERNIER TUNING for single side band intelligibility.

4. Readjust special controls for signal reception improvement, noise orinterference elimination, etc. -- NOISE LIMITER, AVC, CALIBRATE,SIDE BANDS, SELECT KCS, BFO, SLOT FREQ.

OPERATION NOTES

AM RECEPTION

I. To obtain maximum fidelity, the widest bandwidth is normally used.However, under conditions of severe interference from spurious signalsor atmospheric noise, the bandwidth is reduced to improve intelligi-bility although some sacrifice of fidelity results. Adjust bandwidth forbest reception.

2. The Slot Frequency control provides an extremely sharp adjustable slotor hole in the selectivity curve. It is normally located outside of thepassband of the second IF (455kc/s). It is brought into the passband for

the purpose of eliminating interference from heterodyne signals on AMand reducing "monkey chatter" on SSB. On CW reception it will ma-terially aid in reducing or eliminating adjacent or co -channel inter-ference.

Whenever the receiver is being tuned for normal reception be sure tofirst rotate the Slot Frequency control to either minus 5KC or plus 5KC fornormal tuning or the center of the passband will be slotted out, produc-ing 2 spot or 2 peak "S" meter readings.

The Slot Depth control (located behind the front panel) is a very gradualvernier adjustment. In view of this, its effect will not be very notice-able unless proper procedure is employed. This procedure is explainedin the service section of this manual. As this control is properly ad-justed at the factory, the setting should not have to be changed unlesschanges have taken place in the circuitry due to component aging etc.

- 19 -

CLOCK TIMER - SET TO ON,ORAUTO IF DESIRED. INSIDE LID,PULL CLOCK SETTING KNOBTO REAR TO ADJUST TIME .

PUSH KNOB TO FRONT TO SETAUTO ON -CONTROL. ONCE ONBY AUTO TIMER, SET MUST BETURNED OFF MANUALLYBEFORE RESETTING CLOCK.

SET TO JUST BEFORETHE POINT WHEREAUDIO OUTPUT STARTSTO DECREASE IN LEVEL.(SEE NOTE 3)

TUNE FOR MAX.CARRIER LEVELMETER READING.

(HEADPHONES

SET TO"RECEIVE"IF RECEIVER ISUSED ALONE. IF RECEIVER IS TOBE MUTED BY TRANSMITTERRELAY CONTACTS (REARCONNECTIONS ), SET TO"SEND7

TO USE CALIBRATE CRYSTAL,SEE CODE RECEPTIONINSTRUCTIONS.

(MAIN TUNING KNOB

1ET TO DESIRED VOLUME

TBAND SELECTOR KNOB

AM RECEPTION

DIAL CALIBRATION -TO BE USEDWITH CALIBRATION CRYSTAL. SEECODE RECEPTION INSTRUCTIONS.

SET TO "SLOW"" MEDIUM"OR"FAST'

IN CASE OF SIGNALI NTERFERENCE,TURNTO POINT WHEREUNWANTED SIGNALIS LEAST. (SEE NOTE 2)

A.M.POSITION

REDUCE BANDWIDTHIN CASES OF SEVEREINTERFERENCE ORNOISE .(SEE NOTE I )

Li BANDSPREAD TUNING KNOB II

SIDEBANDS "BOTH"

FOR AM, SET TO MAX. REDUCE IFCARRIER LEVEL METER EXCEEDS4-40. S METER CALIBRATIONACCURATE ONLY WHEN RF GAINMAX, AND AVC IN "SLOW;"MEDIUM" OR "FAST':

CARRIER LEVEL METER DOES NOTREAD WHEN AVC IS "OFF."

CLOCK TIMER SEE AM RE-CEPTION FOR INSTRUCTIONS.

SET TO JUST BEFORETHE POINT WHEREAUDIO OUTPUT STARTSTO DECREASE INLEVEL. (SEE NOTE 3)

BANDSELECTORKNOB

TUNE FOR MAX.SIGNAL LEVEL.SEE NOTE 4)

HEADPHONES

SET TO "RECEIVE IFRECEIVER IS USEDALONE. IF RECEIVERIS TO BE MUTED BYTRANSMITTERRELAY CONTACTS(REAR CONNECTIONS),SET TO "SEND"

FOR DIAL CALIBRA-TION SET TO" CACBE SURE BFO ANDVERNIER SET TO"O':CHECK THAT AVC ISOFF, AND AM- SSB -CW SWITCH IS ON"CW

AFTER TUNING TO ZERO BEAT, TURNTO SET HAIRLINE EXACTLY ON 100KCSMULTIPLE SELECTED.TURN BACK TORECEIVE, RETUNE TO STATION, AND READFREQ. ON DIAL UNDER HAIRLINE.

AFTER TUNING RECEIVER CORRECTLY,SET TO TONE PITCH DESIRED. ( SEENOTE 6)

IN CASE OF SIGNAL INTER-FERENCE, TURN TO POINTWHERE UNWANTEDSIGNAL IS LEAST. ( SEENOTE 2 )

CODERECEPTION

MAINTUNINGKNOB

NFill7171RaLUI,DIQ 8GA

VOLUME.

SET TODESIRED

SET TO DESIREDVOLUME BUTKEEP LOW TOAVOID OVER-DRIVING RECEIVER.

NOW SET MAINTUNING TO IOOKCSMU_TIPLE NEARESTTO STATION WHERECALIBRATION ISDESIRED.TUNE TOZERO BEAT.(SEE NOTE 5 )

C.W.POSITION

VERNIERTUNINGKNOB

4 -

SET TO LEASTBANDWIDTHTO REJECT ASMUCH INTER-FERENCE ASPOSSIBLE.

SIDEBANDS BOTH

piBANDSPREADTUNINGKNOB

SEQUENCE OF

ADJUSTMENTS

3. The automatic noise limiter can reduce noise to the point where itsaudio level is electrically no higher than the desired signal level.This point is indicated by the start of audio level decrease as thelimiter control is rotated clockwise. The proper setting for thiscontrol is therefore at the point just before the audio output of thedesired signal is reduced. Further rotation decreases noise andsignal equally without improving signal-to-noise ratio.

CODE AND SINGLE STDEBAND RECEPTION

4. Interrupted continuous -wave (ICW) transmissions do not normallyprovide steady signals for S -meter readings. However, readingscan be made fairly well in CW reception using the "SLOW" AVCposition of the AVC switch. In any case tune for the loudest signallevel heard.

5. The 100 KCS multiples of the Crystal Calibrator will be found at ornear the one decimal numbers only, such as 1.9, 14.3, etc. whenthe Send/Rec/Cal switch is in the Cal position. (Read "How To UseThe Band Spread Dial" in the Operation section of this manual. )

6. For code reception, never set tone by adjusting main tuning, be-cause this detunes the Receiver. Always set BFO to zero first, tunereceiver for zero beat, THEN set BFO for desired tone.

7. On SSB, carrier level meter fluctuates with audio. Tune for maxi-mum audio or apparent S -meter level.

8. SSB, (Single Side Band) signals can be identified by the lack of acarrier or beat note ("whistle") when tuning across the signal. ASingle Side Band signal NOT properly tuned in will sound scrambledand extremely nasal. Adjust the Main Tuning dial for maximumsignal strength (to be judged by ear or S -meter). Adjust the VernierTuning for maximum speech intelligibility. (The Vernier Tuningmust be tuned slowly for effectiveness) Intelligibility can only beobtained by proper choice of upper (u) or lower (1) sideband reception.The BFO (Beat Frequency Oscillator) control is disconnected in SSBposition.

9. The accepted or most popular transmission of single sideband signalsinsofar as the sideband used will usually be as follows:

75 meters40 meters20 meters15 meters10 meters

3.8 to 4 mc7. 0 to 7.2 mc14.200 to 14.350 mc21.250 to 21.450 mc28.6 to 28.7 mc

Lower SidebandLower SidebandUpper SidebandUpper SidebandUpper Sideband

The use of upper or lower sideband will vary on the other bands coveredby this receiver and it is not unusual for the other sideband to be used onthe above mentioned bands. If a SSB signal cannot be made intelligibleusing the vernier t uning control, change to the other sideband switch position.

- 22 -

CLOCK TIMER SEE AMRECEPTION FOR INSTRUCTIONS.

SET TO JUST BEFORETHE POINT WHEREAUDIO OUTPUTSTARTS TO DECREASEIN LEVEL . (SEE NOTE 3)

BANDSE LECTORKNOB

TUNE FOR MAX.SIGNAL LEVEL.(SEE NOTE? )

HEADPHONES

SET TO"RECEIVE" IF RECEIVER ISUSED ALONE. IF RECEIVER IS TOBE MUTED BY TRANSMITTERRELAY CONTACTS (REAR CON-NECTIONS ), SET TO "SEND':

TO USE CALIBRATE CRYSTAL,SEE CODE RECEPTIONINSTRUCTIONS.

DIAL CALIBRATION- TO BE USED WITHCALIBRATION CRYSTAL, SEE CODERECEPTION INSTRUCTIONS.

SINGLESIDEBANDRECEPTION

SET TO" SLOW "OR" MEDIUM".

MAIN TUNING - SET FOR LOUDESTSIGNAL, IGNORE INTELLIGIBILITY(SEE NOTE 8 )

SET TODESIREDVOLUME.

BFO : SET TO CENTER FOR HQ -180,FREQUENCY DOES NOT VARYIN"A"SERIES.

FOR SS B, SETTO MAX. ORAS DES RED.

IN CASE OF SIGNAL INTER-FERENCE, TURN TO POINTWHERE UNWANTED SIGNALIS LEAST. (SEE NOTE 2)

VERNIER TUNINGADJUST FOR BESTINTELLIGIBILITY

MAINTAIN 2 OR3KCS BANDWIDTHTO ASSUREINTELLIGIBILITY

ofSEQUENCE BANDSPREADOF TUNING TUNING

SET TO"U"(UPPER)OR" L Is (LOWER)DEPENDING ON SIDE -BAND USED. SEL-ECTION RESULTSFROM EXPERIENCEAND METHOD OF SSBOPERATION ONPARTICULAR BAND.

HQ -180A MAINTENANCE

This Receiver has been carefully constructed, inspected, adjusted andaligned at the factory to provide a long period of trouble -free use. Unlessyou have the proper equipment and the detailed knowledge to service complexelectronic circuitry, it is not recommended that any other maintenance buttube testing be attempted. In particular, DO NOT ADJUST TRIMMERS ORTRANSFORMER CORES, because this will reduce the reception capabilities,unless it is done while following the alignment instructions correctly.

HQ -180A CIRCUIT DESCRIPTION

Many Receiver troubles can frequently be resolved simply by testing andchanging tubes and by making a few minor adjustments, but in order to properlyservice this set it is important to be able to diagnose obscure troubles throughan understanding of the circuits involved. It is for this purpose that this sectionis provided. A communications receiver of this type contains several specialcircuits not normally included in the home radio. Examples of such circuitsare the BFO (beat frequency oscillator), the slot, triple conversion, delayedAVC (automatic volume control), etc.

The complete circuitry of the HQ -180 and "A" Series, is shown in theschematic diagrams included at the end of this book. To help in understandingthese diagrams, a block version is presented on the next page. While readingthe test, follow both the block and schematic diagrams -- one will illustrate theoverall system, while the other will provide all of the connection details.

The "X" series of receivers provides an eleven position fixed frequencycrystal oscillator assembly which is factory installed in the panel space pro-vided for the 24 hour clock timer. The knob allows selection of normal vari-able frequency tuning or any one of eleven fixed frequencies crystal controlled.Six crystals are mounted on the front plate of the oscillator assembly and maybe changed quite readily to shift frequencies. The remaining five crystals aremounted behind the front panel on the oscillator box and may be changed bylifting the top cover of the cabinet. It is intended that the five inside crystalswill be for commonly used channels not subject to being changed very often.The receiver can be zeroed into the channel frequency by manipulating the verniertuning control on the front panel. This will correct for frequency discrepancydue to crystal tolerance and assure accurate "netting".

The use of the crystal controlled oscillator will permit the highly stablereception of signals on the eleven channels selected. The only operation re-quired besides turning the selector switch to the desired crystal position isto turn the band switch to the desired crystal position and tune the main dialto the approximate frequency rocking the knob for maximum "S" meter indication.

In order to ensure proper operation, the crystals should be ordered fromyour local authorized Hammarlund distributor.

- 24 -

RF

455KCGATE

3035XTALFILTER

100K C XTALCAL

455KC 455KC 60KC 60KC IF AMPAMP SLOT 2nd. IF IF AVC AM NOISE

IF FILTER CONV. AMP AMP DETECTOR LIMITER

395KCOSC

3KCVERNIERTUNING

TOVFO,MIXER,CONV OSC

METER AMP

BFOS METER

AMP

RECTIFIER

HQ -180 & HQ-I80A SERIESRECEIVERS

I st AUD6AV6 DELAY

AVC

(SILICON RECTIFIERIN "A" SERIES)

455KC 455KC 60KC 60KC IF AMP455KC AMP SLOT 2nc IF IF AVC AM NOISE

GATE IF FILTER CONY. AMP AMP DETECTOR LIMITER

± 5KC

3035XTALFILTER

XTALOSC

395KC0 SC

3KCVERNIERTUNING

TOVFO, MIXER,

CONY. OSC.METER AMP.

II POSIT ON FIXEDFREQ XTAL

OSC.

NUVISTOR

BFOS METER

AMP

RECTIFIER

(SILICON RECTIFIERIN "A" SERIES)

CRYSTAL CONTROLLED FIXED FREQUENCY MODEL

HQ-180XE E HQ-180AX

OUTPUT

1st AUDDELAYAVC

OUTPUT

The oscillator or actual crystal frequency for a given signal frequencyshall be determined from the following:

SIGNAL FREQUENCYRANGE mc

ADD IFFREQUENCY mc

SUBTRACT IF-FREQUENCY mc

MODE OFOPERATION

.54 to 1.05 mc .455000 Fundamental1.05 to 2.05 mc .455000 Fundamental2.05 to 4. mc .455000 Fundamental4.0 to 7.85 mc .455000 Fundamental7.85 to 15.35 mc 3.035 Fundamental

15.35 to 20.662 mc 3.035 Fundamental20.662 to 30.000 mc 3.035 2nd Harmonic

NOTE: WHERE LOW SIDE INJECTION IS SPECIFIED, HIGH SIDE INJECTION MAYBE USED AT REDUCED SENSITIVITY.

The RF signal is received at the antenna and applied to the RF amplifierthrough the antenna terminal strip or shielded connectors, and through the band -switched antenna tuned circuit. The antenna trimmer, compensating for differingantenna characteristics at differing frequencies, is located across the secondaryof the antenna transformer. The calibration oscillator, turned on in the calibrateposition, applies its signal to the RF amplifier. This oscillator is a crystal con-trolled type at 100 KCS, developing a very large number of 100 KCS harmonicsto cover all of the bands in the Receiver.

To control the Receiver sensitivity, one section of the RF gain control setsthe bias of the RF amplifier stage. Rotating the control clockwise decreasestube bias, permitting increased amplification and thereby increasing sensitivityto weaker signals.

From the RF amplifier the signal is applied to the first mixer where it isheterodyned with the output of a separate high frequency oscillator. The resultingfrequency is the first intermediate frequency (IF). From .54 to 7.85 mc/s theHF oscillator is located 455 kc/s above the signal frequency. From 7.85 to30 mc/s the HF oscillator is 3035 kc/s above the signal frequency. Whenoperating the 7.85 to 30 mc/s bands, the difference frequency of 3035 kc/s isfed through a crystal filter and is heterodyned with 2580 ,icris crystal controlledoscillator in the converter tube to produce 455 kc/s 2nd IF. When the BandSelector switch indicates .54 to 7.85 mc/s the converter tube ceases to functionand the gate tube becomes a regular 455 kc/s amplifier. Band switching andfrequency tuning occurs in the grids of the mixer and of the oscillator. Thearrangement of heterodyning used in this Receiver is listed in the accompanyingchart. The stability of the oscillator circuit, a must for accurate and repeatabletuning, is maintained by using a separate tube, and keeping the heater supplyon at all times, minimizing drift tendencies. In the "A" series only, the fila-ment is supplied with power through filament transformer T30 as long as theline cord is connected to a source of power. If the clock is mounted, powerwill be required at all times.

- 26 -

The chart of the heterodyning system shows that the second mixer becomesa 455 KCS amplifier on the two lowest frequency bands. Section S2F of the bandswitch accomplishes this by removing the crystal circuit from the oscillatorportion of the tube at this time. When the oscillator is allowed to work, thefirst IF signal beats with the oscillator signal to become the second IF.

V4 is a 455 KCS amplifier whose gain is also controlled by a second sectionof the RF gain control, resulting in receiver sensitivity adjustment in the samemanner as before.

Before the 455 KCS signal is applied to the third mixer, it is passed throughthe slot circuit. This circuit is designed to provide a narrow section of fre-quency rejection capable of being set precisely on an interfering signal. Theslot depth control permits its depth or amount of rejection to be set as requiredfor best results. The diagrams show the characteristics and the capabilities ofthis circuit.

BAND Frequencies in KCS1st 1st 2nd 2nd 3rd 3rd

MCS RF OSC IF OSC IF OSC IF

. 54 - 1.05 S S 4- 455 455 (Amplifier Stage) 395 60

1.05 - 2.05 S S 4 455 455 (Amplifier Stage) 395 60

2.05 - 4.0 S 5 4 455 455 (Amplifier Stage) 395 60

4.0 - 7.85 S S 74 455 455 (Amplifier Stage) 395 60

7.85 - 15.35 S S -,L 3035 3035 2580 455 395 60

15.35 - 30.0 S 5 4 3035 3035 2580 455 395 60

S = Signal Frequency Received

CHART OF FREQUENCY HETERODYNING

- 27 -

Db

10

20

30

40

50

60

70

80

10

20

30

40Db

50

60

70

80

UPPER455 KCS

LOWER

7 6 5 4 3 2 0 I 2 3 4 5 6 7

KILOCYCLESSLOT FREQUENCY AT CENTER

60 KCS PASSBAND CENTERUPPER LOWER

setmirror

Upper

Note:

Sidebandsto

image

Sidebond

Lower

Sidebondin the

of

Sw.

-

Whenis

a

theappears

G

Lower

F

E

E

F

G

Selectivity Sw. Sidebands Sw.

I KCS2 KCS3 KCSI 1 1

UPPERUPPERUPPER1 l I

7 6 5 4 3 2 I 0 1 2 3 4 5 6 7

KILOCYCLESSINGLE SIDEBAND PASSBAND CURVES

I0

20

30

40Db

50

60

70

80

10

UPPER455 KCS

LOWER

7 6 5 4 3 2 0 2 3 4 5 6 7

KILOCYCLESEXAMPLE OF SLOT AT +3 KCS SUPERIMPOSEDON THEORETICAL 455 KCS PASSBAND CURVE

20

30

40Db

50

60

70

80

60 KCS PASSBAND CENTERUPPER LOWER

Ihi

Selectivity Sw. Sidebands Sw.

A

El

C

DI

.5 KCSI KCS2 KCS3 KCSI I 1

UPPERBOTHBOTHBOTH

I I I

7 6 5 4 3 2 I 0 I 2 3 4 5 6 7KILOCYCLES

FULL RESPONSE CURVES ,BOTH SIDEBANDS

Conversion again occurs to result in a third IF of 60 KCS. Three stages of60 KCS IF amplification are provided along with means for adjusting the selec-tivity of the receiver to aid in the rejection of unwanted interfering signals. Thisis especially useful for code reception where little sidebands are transmitted. Awide band receiver is a detriment here because of such a receiver's capabilityof amplifying all nearby stations almost as well as the one to be listened to. Forsingle sideband operation, a second switch permits setting the receiver passbandfor maximum reception only on the side of the carrier required for reception.

The signal delivered from the 60 KCS amplifier stages is then applied tofour separate detector circuits, two for efficient audio development, and two forthe generation of correct AVC voltages that will assure the best possible receptionof all types and levels of RF signals. The general block diagram shows that AMreception is handled by a normal diode detector circuit. See the simplified sche-matic of the detector, BFO and noise limiter circuits. In the AM position, theresulting audio is passed through the noise limiter tube V10 and on to the audiogain. control.

In the CW position, V9 acts as a product detector, and the audio is developedfrom the beat between the incoming 60 KCS and the output of the BFO at a fre-quency that is at or near 60 KCS depending on the setting of the BFO control. TheBFO is aligned so that zero beat occurs when the BFO control is centered. Theaudio output is then taken from the junction of R73 and R74 and applied throughthe CW position of the mode switch to V10 in the same manner as for the AMaudio.

Single sideband detection is exactly the same as for CW except that the BFOis a fixed frequency in the "A" series. For the HQ -180 series, keep BFO con-trol at "0". In SSB operation tuning for intelligibility requires that the suppressedcarrier be replaced within the receiver. The BFO does just that, the verniertuning dial being used to precisely tune the receiver to the sideband that has beentransmitted. The heterodyning between the BFO frequency and the received side -band produces audio in the same manner as audio is produced for CW.

The noise limiter is a very useful circuit that is designed to assure that nonoise or interference signal peaks will be higher than the wanted signal. If the"OFF" position, B is applied to the plates of V10, while the cathodes aregrounded. Since the tube sections are conducting, any signal applied to V10 fromthe detectors is passed through to the audio gain control. In the "ON" position,the plates are connected to ground, while B -A is applied to the cathodes throughthe noise limiter control. The circuit is arranged that when the control is at itscounterclockwise end of rotation, audio is permitted to pass through almost un-reduced. As the control is turned clockwise, the B -74 applied to the cathodesincreases so that strong peaks are clipped. In operation, it will be noted thatthe noise limiter is used to clip noise peaks that are higher than the desired audio;the control is therefore turned clockwise until it is noted that the wanted audiostarts to be clipped (volume reduced). The correct position of the control isjust below the point where this occurs. At this point, maximum clipping isoccurring without reducing the wanted signal. The noise limiter is capable ofoperation on any type of signal, but it should be noted that less noise and inter-ference can often be obtained oy reducing the receiver bandwidth as well.

- 29 -

C42FROM (ocv

60 KCS I.F

L8

v8CAM

DETECTOR

'7=

V9PRODUCTDETECTOR

C43

R37

AM0\SSB o

CW 0

MODESWITCH

POSITIONSS7

C44 R42

NB+

NNN

N

TC124R41

C45 R73

FIXED FREQ.

FOR SSB

TO 3rd.OSC.

GRID

NNN

NN

C46

R43

VIONOISE

LIMITER

NOISE LIMITER \---\AND

CONTROL SWITCH \R78

V I3ABFO

CLOCKWISE

DETECTOR, BFO & NOISE LIMITER CIRCUITS

B+

R45

R46

C47TO AUDIOGAIN CONTROL

Bi-

R44

C49

Automatic volume control voltages are developed from the two circuitsillustrated. RF detection takes place through both V8B and the diode sectionof V16. Each circuit is arranged to reduce a negative voltage that will increaseas the received signal increases. Except in the "OFF" position, AVC voltagesare applied to the RF amplifier, to the 2nd IF amplifier, to the 3rd mixer, andto the 1st 60 KCS IF amplifier. The positive voltage developed across R92 pre-vents AVC from being applied to the RF amplifier until the incoming signal ishigh enough to overcome it. This delayed AVC improves the reception of weaksignals.

The other AVC circuit is not biased in this fashion, but it is designed toallow for an adjustable decay characteristic. AVC is applied immediately, butits decay in the event of fading is adjustable to be slow, medium or fast depend-ing on the type of signal and on the atmospheric conditions of the time. R83,R84 and R85 set the discharge time of C131, creating the appropriate AVC decay.

The carrier level "S" meter circuit operates on the same AVC signal justdescribed. The circuit is a bridge, with the tube and R88 on one side, andR21, R20 and R22 with its switched resistors on the other. The meter is in thecenter of the bridge, set to zero in the absence of a signal (AVC zero). When asignal is received, AVC is developed, the tube current changes to unbalancethe bridge, and the meter reads. The greater the signal, the greater the un-balance, and the higher the meter reading. The sensitivity setting is made onlywhen a signal of known strength is applied to the receiver, usually from a pre-cise signal generator whose output level can accurately be measured.

The audio stages are conventional in nature, except for the special auto -response circuit illustrated. This is a negative feedback system that providesmaximum effect at low audio gain control settings. Strong signals are then per-mitted the highest fidelity of response and lowest distortion, while increasingthe gain on weak signals narrows the audio response to improve signal selec-tivity. An improved signal-to-noise ratio results. A further advantage is thecritical damping of the speaker for elimination of speaker resonance effects.Speech reception is improved and receiver output noise is reduced.

The receiver power supply is arranged to permit the 1st oscillator andmixer to remain heated even when the rest of the set is turned off (in the "A"series only). As has been previously mentioned, this to provide increased re-ceiver stability. The schematic diagram shows these tubes heated from aseparate filament transformer, connected to the power line through only thefuse. The electric clock timer is also connected to the line in the same manner.The timer switch mechanism is in series with the normal on -off switch so thatthe set can be turned on automatically at any desired time. The timer mech-anism is designed that it must be turned off manually to reset the mechanismfor automatic turn -on in the next 24 -hour period.

Plate voltage regulation is enhanced through the use of silicon rectifiers(in the "A" series only), and further stability is established with a gas regu-lator tube for the critical RF stages and for the calibrated "S" meter.

- 31 -

C39FROM i

60 KCSIF

V151ST AUDIO

AMP 8DETECTOR

FOR AVC

L7 0

V 8BDETECTORFOR AVC

C145

IC147V

C23

P 99

OFF

AVC o SLOWSWITCHPOSITIONS ()MEDIUM

S80 FAST

R 96

.----.. C41

R92 R93 -C146

GROUND

CONNECTED

IN " OFF "

ONLY

DELAYEDAVC TORF AMP

AVC & "S" METER CIRCUITS

R88

R21

'V\A.

V138METER

AMP.

R19METER SENS.

METER

R22 j R91 P90

AVC TO2 ND IF AMP,

RDI ST 6'"0,P0 Amp

R 20ZEROADJ

R89

Except for the power transformer primary connections, the supply cir-cuitry for the export version is the same.

Finally, there are the accessory and system sockets, and the send- re-ceive switch, each clearly illustrated on the schematic diagram and self-explanatory. In the send position, the B to the RF amplifier, the 2nd mixerand the 2nd IF amplifier is removed, muting the receiver. Further or alternatemuting can be applied through the system socket from the transmitter (in the"A" series only).

+4+2

0

-2-4-6-8-10

- 12

-14-16-18-20-22

/'s1.-....-_...................._ ......

_/B/ A N

\// 1

AUDIO CHARACTERISTIC

A MAX. AF GAIN CONTROLB--- AF GAIN APPROX. 25% OF

ROTATION FROM MIN. SIMU-1LATING AVERAGE SETTING.

A INPUT ACROSS AF GAIN.IOVCONTROL CONSTANT.

B INPUT I.4V ACROSS AF GAINCONTROL CONSTANT.

10 102 103

FREQUENCY IN CYCLES PER SECOND

AUTO -RESPONSE CURVE

104

- 33 -

AUDIO

AF4IGAIN

R79

R77

V15

R80AUTO -RESPONSE

FEEDBACKLOOP

AUTO -RESPONSE CIRCUIT

PHONES

-0

O

O

50011

3.211

GND

HQ -180A SERVICE AND MAINTENANCE

This section will provide the instructions for the correct servicing of theReceiver. While no particularly unusual procedures are called for, it shouldbe noted that proper tools and test equipment must be available to undertake theelectrical alignment. Inadequate or inaccurate test equipment may result ingenerally poor operating results.

Excessive oscillator drift which is most noticeable on all of the high fre-quency bands plus a microphonic condition, is usually the result of a poor6C4 (V12) high frequency oscillator. This tube is also capable of producing apoor beat note with a ripple in it, also especially noticeable on the high bands.Excessive drift can also be attributed to a poor 6BE6 (V2). This tube can alsocause hum modulation most evident on the two highest frequency bands. Some-times interchanging the 6BE6s between V2 and V3 can produce a noticeable im-provement.

Normally there is no reason to remove the chassis from the cabinet, be-cause the top cover allows access to all of the tubes, and to the clock adjustment.However, in the case of RF and IF alignment, it will be necessary to take thechassis out to gain access to the under -chassis alignment settings.

Further disassembly is not recommended except in the case of dial cordreplacement. As this is a steel cable, breakage is unlikely, but if it should,it will be required to remove the front panel from the chassis, and to removethe two calibrated dials.

The instructions for the removal of the chassis from the cabinet, and forthe disassembly of the front panel, are presented here. Follow the instructionsteps with care, and there will be no trouble identifying and replacing all ofthe parts. Note particularly the knob and dial alignment procedures.

Removing Receiver Chassis from the Cabinet

1. Disconnect all wires and cables at the rear of the chassis.

2. Tip the cabinet up from the front and remove the hex head screw on the bottom.

3. Remove the three hex head screws at the back of the cabinet.

4. Loosen the two Phillips head screws at the top front of the cabinet; do notremove them.

5. Slide the panel and chassis forward to clear the cabinet. Guide the line cordas necessary. It is advisable to set the chassis down so that the panel over-hangs the edge of a table. This will protect the panel finish, and relievestrain on the panel mounting screws.

- 35 -

PHILLIPS OVALHEAD SCREWS

TOP FRONTPANEL CLIPS.

(INSERT PRONGS UP)

FRONT

CLIP

DETAIL

HEX HEADSLOTTEDSCREWS WITHLOCK & FLATWASHERS.

HARDWARE TO FASTEN CHASSIS TOCABINET

Replacing Receiver Chassis in the Cabinet

1. Slide the chassis and panel into the cabinet, guiding the line cord through therear opening as necessary. Check that the "L" bracket under the chassisdoes not catch under the cabinet as the chassis is slid into it. Make surethe cabinet edges are fitted into the slot around the inside edge of the panel.Check that the clips fit under the panel edge as shown in the illustration.

2. Insert the three screws, lock and flat washers in the back of the cabinet. Donot tighten firmly yet.

3. Tip up the cabinet and insert the screw, lock and flat washer in the bottomfront of the cabinet. Do not tighten yet.

4. Tighten the three screws in the rear first, then tighten the screw on the bottom.

5. Tighten the two Phillips head screws in the top of the cabinet.

Removal of the Front Panel from the Chassis

Refer to the diagrams for the locations and identification of all parts.

Step 1. Remove all knobs except those of the clock and dial calibration.Turn all capacitors so that their plates are fully meshed.

Step 2. Remove the following:

Nuts from the controls shown on the diagram.Nut and lock washer from the headphone jack.Screws and lock washers from the capacitors.Pry off the two red pointers; be careful not tobend them.

Step 3. On the back of the front panel, remove the following:

Large nuts and fiber washers.Dial calibration drive discs."S" meter lamp assembly.

Unsolder the two wires to the meter, and the three wires on theclock.

Pull off the other :wo lamp assemblies for working convenience inlater steps.

Step 4. On the front of the panel, remove:Four Phillips screws and nuts.One smaller Phillips screw and "L" bracket. Holdpanel to prevent it from falling as the last screw isremoved.

This completes the removal of the front panel.

- 37 -

DIALCALIBRATIONKNOB

CLOCKKNOB

ROUND -NO MARKSALL OTHERS -ROUNDWITH WHITE MARKS.

/I

LARGE BAR LARGE POINTERROUND TYPE ROUND SHAPE

REMOVE ALL KNOBS EXCEPT CLOCK AND DIAL CALIBRATION

STEP 1

NUT ONLY

SEE NOTE*

NUT ANDFLATWASHER

0 0

.000

PRY OFFPOINTERS

0

TWO SCREWS ANDLOCK WASHERS

0 0 0 0 0 0 0 0REMOVE NUTS, SCREWS AND WASHERS

INDICATED.* SET SCREW OF KNOBS TO LINE UP

WITH FLATS OF SHAFTS.

NUTONLY

SEE NOTE*

CAUTION TO PREVENT DAMAGE TO CAPACITOR PLATES,MAKE SURE THEY ARE FULLY MESHED.

STEP 2

-- REMOVE -3.

DETAIL OF DIAL

CALIBRATION DRIVE

PANELASSEMBLY

REMOVE NUTS ANDFIBRE WASHERS

FIDUCIAL

REMOVE LAMP ASSEMBLYNUT AND LOCKWASHER

REAR OFPANEL

RED a BLK BLK. WHT

"S" METER WIRES UNSOLDER *

Y EL Bi BLK.

BLK Eit WHT.

RED a BLK

CLOCK WIRESUNSOLDER

REMOVE AND UNSOLDER AS INDICATED - FOR CONVENIENCE, - PULL OFFOTHER TWO LAMPHOLDERS.

* DO NOT REMOVE NUTS FROM METER, THESE ARE INTERNAL MOUNTING STUDS.

STEP 3

PHILLIPSSCREW ANDNUT WITHCAPTIVELOCKWASHER.

PHILLIPSSCREW ANDNUT WITHCAPTIVELOCKWASHER.

PHILLIPSSCREW AND"L" BRACKET.

REMOVE SCREWS, NUTS AND BRACKET INDICATED

CAUTION - HOLD PANEL TO PREVENT FALLING

STEP 4

Step 5.

Step 6.

Loosen but do not remove the set screws on the two dials. DONOT MOVE THE SET SCREWS OF THE PULLEYS. Now pullthe two dial assemblies forward, at the same time guiding theleft dial out of the tuning drive discs.

TOPVIEW

LOOSEN

TWO ALLEN SET SCREWSIN EACH

fo 4 ofDIAL, DIAL

REMOVE COMPLETE DIAL ASSEMBLY AS ONEPIECE , PULL FORWARD AND OUT OF DRIVE.

STEP 5.

Replace the two dial assemblies on their shafts, inserting the leftdial into the tuning drive discs. Make sure that the tuning capacitorplates are fully meshed, then turn the dials so that the left end ofeach dial is approximately vertical.

Push on the dials so that the shaft ends are about 1/8 inch recessed.It should be possible to see the previous set screw marks on theshafts to help in this setting.

Now tighten one set screw on each shaft. Final setting will comein a later step.

Step 7. Check that the proper nuts and lock washers are in place on the con-trols that were removed from the front panel.

Locate the panel in place, inserting the controls in their properholes.

Secure the front panel by replacing the hardware removed in Step 4.

Note that the "L" bracket fits over the small terminal strip locatedinside the chassis.

- 42 -

Step 8.

Step 9.

On the back of the front panel, replace the hardware removed inStep 3. Check that the dial calibration drive is correctly restoredwith the transparent segment within the discs. Resolder the wiresto the meter and to the clock; see the Step 3 illustration for thewire color code.

On the front of the panel, replace the hardware removed in Step 2.Be careful not to scratch the panel when tightening the nuts, andremember to line up the flats of the two controls indicated in theStep 2 illustration,

After Step 9 is completed, check that the dials and the dial calibration systemoperate smoothly and without interference. If necessary, loosen the front panelscrews of Step 4 and readjust panel positioning to obtain proper dial operation.

Step 10. Replace the two red pointers by pushing them onto the inner shafts.Be careful not to bend them. Follow the instructions on the Step 11diagram for capacitor plate meshing, then replace all knobs. Knobidentification appears in the Step 1 illustration.

Step 11. This step is for dial alignment.

Reconnect the Receiver and turn it on. Allow it to warm up forabout a half hour.

After the warm-up period, tune in to 4 MCS on the Main TuningDial and 100 on the logging scale of the Band Spread Dial, andturn on the crystal calibrator (see instructions in the User's Manual).

Set the dial calibrator so that the hairline is in line with the markon the top of the opening in the dial escutcheon.

Noting that the tuning capacitor plates are in the correct positionfor the low end of the band (fully meshed), tune for zero beat,ignoring the dial frequency setting.

Loosen the left dial set screw, hold the capacitor pulley to maintainzero beat, then set the dial to exactly 4 MCS. Now tighten the dialset screw again FIRMLY.

Turn the dial to gain access to the other set screw on that dial, andtighten it firmly as well. Repeat the same procedure for the rightdial, but using 100 on the logging scale. this time.

This completes the dial calibration procedure. Check on other bands; if dialcalibration is far out, or not possible to be attained, RF alignment will have tobe undertaken.

- 43 -

LOCKWASHERONLY

O o i 0DIAL

O

oTUNINGDRIVE

LOCKWASHERAND NUT

ifa

FRONT OFCHASSIS

DIAL

LOCKWASHERONLY

0

Oo o

OBAND SPREAD

DRIVE

HARDWARE FOR MOUNTING CONTROLS- WHEN PANEL IS REMOVED

STEP 7

4111111111r-

SET CONTROLS COUNTER -CLOCKWISE, SWITCH OFF IFSO EQUIPPED.

SET CAPACITOR PLATESOUT OF MESH FOR IN-STALLATION OF THIS KNOB.

SET CAPACITOR PLATESIN MESH, PUSH ON POINTER,THEN KNOB.

KNOB ALIGNMENT POSITIONS- REMAINING SHAFTS HAVE FLATSIF KNOB ALIGNMENT IS REQUIRED.

REPLACING POINTERS AND KNOBS

STEP 10

Alignment Procedure

This Receiver has been carefully aligned at the factory and should neverrequire any more than a touch-up to retain the peak of its performance. Ifalignment is necessary, follow the instructions provided below with care.

For the alignment procedure, the equipment listed is required:

Non-metallic alignment tools, general Cement #5097 and#8282, or equivalents.

DC Vacuum -tube Voltmeter.

Signal Generator(s) capable of accurately producing unmodulatedsignals of:

60 KCS, 455 KCS, 3035 KCS, and RE ranging from.54 MCS to 30 .0 MCS.

Alignment must be undertaken with the Receiver out of its cabinet. Removethe chassis from the cabinet as instructed in this Manual. When removed, setthe chassis on its end with the power transformer down nearest the table top.This is to permit access to both the top and bottom of the chassis.

Before operating the Receiver, adjust the "S" meter pointer screw on thefront face of the meter to set the needle exactly over the zero mark on thescale.

Connect the speaker to the Receiver, plug the set into a source of power,and turn it on.

BEFORE ALIGNMENT, THE RECEIVER MUST BE ALLOWED TO WARM UPFOR AT LEAST A HALF HOUR. This is to assure frequency stability.

KNOBFUNCTION

NOMINALPOSITION

Band Selector 7 85 - 15.35 me bandBand Spread Tuning Dial (arbitrary) 100AM/SSB/CW Selector AMSide Band SelectorSelectivity Selector 5KcsSlot Frequency Counter -clockwiseSlot Depth See AM ReceptionBeat Frequency Oscillator 0Noise Limiter OffAVC OffAntenna CenterCalibration Reset CenterSend -Receive Switch ReceiveAudio & RF Gain Adjust to Test Requirements

- 46 -

After warm-up, set the RF gain control fully counterclockwise without actuallyturning the set off, and adjust the meter zero control at the rear of the Receiverchassis again for zero on the scale. The AVC switch must be set to a positionother than "OFF" for the meter to read.

S METERZERO

ADJUSTMENT

REAR OF CHASSIS

Set all of the front panel controls as shown in the illustration at the start ofthe alignment procedure. Changes to these settings will be required as the align-ment progresses.

Except where noted in the diagrams, the coil slugs are set from the top ofthe can. Be careful that you are actually turning the proper slug; it is some-times easy to be adjusting the wrong one, or even to be turning both at once ifthey happen to be close together inside the coil.

IF ALIGNMENT

Step 1. Connect the VTVM to the junction of L8 and C44 and chassis ground.

Connect the Signal Generator for the 60 KCS First Adjustments tothe junction of C28 and T5 and chassis ground.

Apply an unmodulated 60 KCS, and set T6, T7, T8, T9, T10 andT11 for a maximum negative reading. Remember to reduce the IFinput signal level as necessary to maintain about -5 volts D.C.

Step 2. Turn the mode switch from AM to CW.

Check that the BFO is set to zero, then adjust T28 for zero beat asheard in the loud speaker.

Return the switch to AM.

Sideband SW to Both.

Selectivity SW to 3 kcs

- 47 -

COUNTERCLOCKWISE

CENTER (" )

SET DIAL CALIBRATIONTO CENTER MARK.

OFF]

RECEIVE

CENTER("0")

UPPER

100 ONLOG SCALE

SET TO 7.85 -15.35 MCSBAND INITIALLY.

CONTROL SETTING AT START OF ALIGNMENT

Step 3. Disconnect the Signal Generator from V5 and reconnect it toPin 7 of V2.

Apply on unmodulated 3035 kcs.

Adjust L4, the top and bottom slugs of T5, T4, and T3, and thebottom slug of T2 and peak T1, for a maximum negative reading.

Remember to reduce the IF input signal level as necessary tomaintain about -5 volts.

Step 4. Turn the Slot Frequency control to zero, and the Slot Depth controlto its mid -position.

Step 5.

Set L3 for minimum meter reading. It may be necessary to raisethe IF input level to be sure of indicating the absolute minimum.

Return the generator level and the Slot Frequency and Depth con-trols to their previous conditions.

For alignment of 455 kc/s IFs, leave the signal generator and VTVMas they were in Step 3 and adjust the top and bottom cores of T3,T4, and T5 for maximum negative reading of the VTVM. Rememberto reduce the IF input signal level as necessary to maintain about-5 volts.

This completes the IF alignment procedure. For RF alignment continue withStep 6 below.

Step 6.

RF ALIGNMENT

All HF Oscillator and RF core adjustments are made from the topof the shield cans. RF trimmer adjustments are made from thebottom of the chassis.

Connect the unmodulated signal generator to the antenna terminaland the generator output ground lead to the antenna ground terminalwith the link closed.

Turn the Band Switch to the .54 to 1.05 mc/s band and the Selec-tivity switch to 1 kc/s. Turn the SideBand Selector to Both.

Set the Antenna control about 30 degrees to the left of vertical(approximately 10 o'clock) and the Main Tuning dial to .60 mc/s.

Set the signal generator frequency to .60mc/s.

- 49 -

(Step 6 - con't.)

Make sure that the Band Spread adjustable indicator is set at thecenter marker and the Band Spread dial is set at 100 on the log-ging scale.

Adjust the top slug in T23, the top slug of T19, and the top slugof T12 for maximum negative reading of the VTVM.

Remember to adjust the generator output and RF gain control tomaintain VTVM reading of approximately -5 volts.

Now adjust the top slug of T1 for maximum negative reading onthe VTVM.

Set the Main Tuning dial to 1.0 mc/s and the generator frequencyto 1.0 mc/s.

Adjust C144, C53 and the Antenna control for maximum negativereading of the VTVM.

Note that the range of the Antenna trimmer is 180 degrees and thecontrol pointer is set for decreasing capacity from horizontal leftto horizontal right and should be well within this range from thelow frequency to the high frequency adjustments.

Check and if the pointer is at the either end of this range, resetit as required and Adjust T12 as found necessary to keep it withinrange.

Since the adjustments at each alignment frequency of the band re-acts on the other, it is necessary to repeat the adjustments untilno improvement is obtained. The final adjustments of the bandshould be the trimmers C144 and C53 at the high frequency align-ment point.

Band Switch to 1.05 to 2.05 positionMain dial to 1.1 mc/sGenerator to 1.1 mc/sAdjust T23 and bottom slugs of T19 and T13 for maximum negativereading of VTVM.

Generator and Main dial to 2.0 mc/s.Adjust C145 and C54 and Ant. Comp. for maximum negative readingon the VTVM. Repeat the two frequency adjustments until no furtherimprovement can be noted. Finish with the high frequency adjust-ments.

- 50 -

(Step 6 - Con't. )

Band Switch to 2.05 - 4.04 mc/s.Dial and Generator to 2.1 mc/s.Adjust T24, T14 and top of T20 for maximum negative readingon the VTVM.

Dial and Generator to 4.0 mc/s.Adjust C146, C55, and Ant. Comp. for maximum negative readingof the VTVM.

Repeat the two frequency adjustments until no further improvementcan be noted. Finish with the high frequency adjustments.

Band Switch to 4. 0 - 7.85 mc/s band.Generator and dial to 4.0 mc/s.Adjust T25, bottom slug of T20 and T15 for maximum negativereading on the VTVM.

Generator and dial to 7.85 mc/s.Adjust C147, C56, and the Ant. Comp. for maximum negative read-ing on the VTVM. Repeat the two frequency adjustments until nofurther improvement can be noted. Finish with the high frequencyadjustments.

Band Switch to 7.85 - 15.35 mc/s.Generator and dial to 7.85 mc/s.Adjust T26, Top of T21 and T16 for maximum negative reading ofthe VTVM.

Generator and dial to 15.0 mc/s.Adjust C148, C57 and Ant. Comp. for maximum negative readingof the VTVM. Repeat the two frequency adjustments until nofurther improvement can be noted. Finish with the high frequencyadjustments.

Band Switch to 15.35 - 30.0 mc/s bandGenerator and dial to 15.7 mc/s.Adjust T27, bottom of T21, and T17 for maximum negative readingof the VTVM.

Generator and dial to 30.0 mc/s.Adjust C149, C58, and the Ant. Comp. for maximum negativereading of the VTVM. Repeat the two frequency adjustments untilno further improvement can be noted. Finish with the high fre-quency adjustments.

- 51 -

"S" METER ADJUSTMENT

1. Turn receiver off, and if necessary adjust the mechanical zeroof pointer with a small bladed screw driver.

2. Turn receiver on, and allow 1/2 hour warm-up.

3. Set Function Switch to receive and turn Sensitivity (R F) controlcounter -clockwise.

4. Adjust meter "zero adjust potentiometer" R20 (rear of chassis)to zero.

5. The meter sensitivity adjustment, R19, is set to obtain an S9reading with 50 microvolts input with the RF gain control atmax.

NOTE

Usually, R19 will not require readjustment, since the factory settingwill vary only slightly as a result of tube changes, ageing, etc. R19should, therefore, be adjusted only in the event that it is desirable tomake the meter more sensitive, or as part of the complete realignmentprocedure.

- 52 -

RF COILADJUSTMENTS

COIL FREQLOCATION MCS

T2IBOT.TOp

157.. 79

T20 1.°PBOT.

2.14 . 0

TOPBOT.

.601. 1

H F OSC. COI LADJUSTMENTS MCS

T27 15.7

T26 7.9T25 4.0T24 2. 1

T23 TOP .60BOT. I . I

CRYSTAL BFOCALIBRATOR (TOP ONLY)C 50 T28

ANT. COIL ADJUSTMENTS MCST15 T16 T12 T17 T13 T14

4.0 7.85 .60 15.7 1.1 2.1

C147 C146 C145 C144 C149 C148

7.8 4.0 2.0 1.0 30.0 15.0HF OSC.TRIMMER ADJUSTMENTS MCS

TiTOP aBOTTOM

SLOTDEPTHCONTROL

T7

L4

T5

T4

T3

T2

L3

RF TRIMMER ADJUSTMENTS MCS

C55 I C56 C53

C79

3 035 KCS

C54

HAMMARLUND MFG. CO.MARS HILL N.C.

MODEL NO. HQ -I80-

455 KCIF

6BA6

60 KCIF

68A6

GATE6BA6

V3 1stCONY.68E6

C52nd CONV.

6BE6

ri60 KC IF

6BA6

AVC-AMDET

68V8

BFO-METER

PROD l2AU7DETI2AU7

0

MIXER68E6

HFOSC6C4

vl R F6V6P

El

CAL6BZ6

RECT5U4 -GB

4D

VI6

LIM6AL5

I st AF -DELAYED

AVC6AV6

POWEROUTPUT6AQ5

4DREG0A2

METER ADJe e

SENS ZERO

ANT

0 0

ANT

013=E1

SPKR. FUSE3.2 OHMSO o' e e e 0 EXT

RELAY0

PT. 26496

TUBE LOCATION LABEL

HAMMARLUND MFG. COMARS HILL, N C

MODEL NO. HQ- 180-XE

455 KC

IFe6BA6

60KCIF V6

6BA6

60KCIF

6BA6

DET6BV8

GATE6BA6

0 1st CONV6BE6

2nd CONY.6BE6

PRODDET

I2AU7

0

B FO -METERI2AU7

MIXER6BE6

HFOSC6C4

0 RF AMPL6BZ6

CAL6BZ6

V20El6C W4

- CRYSTALOSC

RECT5U4 -GB

LIM6AL5

1st AF -DELAYED

AVC6AV6

POWEROUTPUT

6AQ5

REG0A2

50-60-II5V - 2 30V

METER ADJ

SENS ZERO

ANT0 0

O0 0

0

ANT

EEO

SPEAKER0 0 0 0 0

3.2 OHMS

0

FUSE 0

0

EXTRELAY

PT 39160-I

TUBE LOCATION LABEL

HAMMARLUND MFG, COMARS HILL, N C

MODEL NO. HQ- 180- A

455 KCIF 86BA6

60KCIF 06BA6

60KCIF

6BA6

AVC AMDET V8 V9

6BV8

VIGATE6BA6

V3 , 1st CONV68E6

0 2nd CONV68E6

HFMIXER OSC68E6 6C4

@

VIRF AMPLVI6BZ6

LIM6AL5

1st AF -DELAYED

AVC6AV6

POWEROUTPUT

6AQ5

REG0A2

BFO-METER12AU7 CAL

PROD 6BZ6DET 50-60-

I2AU7 115V - 230V

ACCESS SOC13+ METER ADJ

0FIL GNI)

SENS ZERO

PT 2418-2-00009

TUBE LOCATION LABEL

VIEW FROM WIRINGSIDE OF SOCKET, ORFROM PIN END OF PLUG.

* ALWAYS ON IFRECEIVERPLUGGED INTOLIVE POWER.

6. 3 VACFROM RECEIVER*

500n.RECEIVER GRIDBLOCK BIAS

MUTING RELAY CONTACTS

.3.2.n_ 500n..GND.

SPEAKER ORLINE CONN.

SYSTEM SOCKET CONNECTIONS

"A" SERIES ONLY

HAMMAR LUND MFG. CO.MARS HILL, N.C.

MODEL NO. HQ -180 - AX

455KCIF 06BA6

60KCV6IF

6BA6

60KCIF

6BA6

AVC -AMDET

6 BV8

GATE6BA6

0 I st CONV. -6BE6

0 2nd CONY.6BE6

PRODDET

I2AU7

0

BFO-METERI2AU7

HFMIXER OSC6BE6 6C4

V2 VI

ORF AMPLVI 6BZ6

CAL6BZ6

V20 r6C W4

-CRYSTALOSC LIM

6AL5

I st AF -DELAYED

AVC6AV6

POWERVI OUTPUT

6A05

0 VI

REGOA 2

50-60'uII5V - 230V

ACCESS SOCMETER ADJ.

0 0SENS ZERO

FIL GND

B+0

ANT

0 EEO 0 0SPEAKER

G 3.2n.500n

FUSE

0 0 0 0

0o0

SYSTEM SOC

PT 2418-2-00010

TUBE LOCATION LABEL

HQ -180TABLE 2. TUBE SOCKET RESISTANCES

Measured with VT Ohmeter; Power Plug and Antenna Disconnected; Unless otherwise specified, Band and Dial 10 MC, AM, AVC (PF,3 KC Both Sidebands, Rec., Limiter OFF, RF Gain Max., AF Gain Min.

TUBESOCKET PIN NUMBERS

1 2 3 4 5 6 7 8 9

VIRF68Z6 480K

80 RFI.17K(MIN)

-- 0 19K 44K 0 -- __

V2MIXER #16BE6

47K 160 0 -- 21K 25K 0 -- --

V3MIXER #26BE6

100K 470 0 __ 21K 45KINF(1MC)

1.8 __ __

V4IF AMP6BA6 1.1 MEG 0 -- 0 I9K 33K

180 RF10K(WIN) -- --

V5MIXER #36BE6

22K .8 0 -- 22K 44K 1.2 MEG -- --

V6 IF AMP6BA6 1.47 MEG 0 -- 0 19K 61K 68 -- --

V7 IF AMP6BA6 470K 0 -- 0 20K 60K 68 -- --

V8DET. AVC68V8 560 17 30K 0 -- 47K 70 0 4.7K

V9PROD DET12AU7

INF20K(SSB)

470K 820 -- -- 55K 100K 820 0

V10 LIMITER210K 1.4 MEG

200K(LIM ON) 0 220K 01.5 MEG

470K(LIM ON)__

VII CAL.6BZ6 470K 4.7K -- 0

INF500K(CAL)

INF110K(CAL) 4.7K -- --

V12 HF6C4OSC.

24K -- -- 0 24K 100K 27 -- --

V13 BFO METER12AU7 17K 0 1K -- --

INF20K(SSB)

545K 47K 0

V14VOLT.REG.0A2 24K -- -- -- 24K -- 0

--

__

V15RECT.5U4-GB

-- 20K -- 2821K

TIE PT. 30AC LINETIE PT. 20K --

V16 AF AVC6AV6 50 APPROX 5.6K -- 0 235K 235K 540K -- --

V17 P OWER AMP.BAR 500K 430 -- 0 22K 21K 500K -- __

V18 IF GATE6BA6

1.1 MEG 0 -- 0 21K INFBig(ImC) 1K -- --

HQ -180

TABLE 1. TUBE SOCKET VOLTAGES

Measured with VTVM; 117 Line Volts, No Antenna; Unless otherwise specified, Band and Dial 10 MC, AM, AVC OFF, 3KCBoth Sidebands, Rec., Limiter OFF, RF Gain Max., AF Gain Min.

TUBE

SOCKET PIN NUMBERS1 2 3 4 5 6 7 8 9

VI RF6BZ6

015.8(MI.5RF

N)6.3 AC 0 245 105 0 -- __

V2 MIXER #16BE6

-2.8APPROX

1.35 0 6.3 AC 245 110 0 -- --

V3MIXER #26BE6

-2.4APPROX 2 0 6.3 AC 140

740(1 MC) 0 -- --

V4IF

68A6AMP.0 0 6.3 AC 0 245 110

2.1 RF29(MIN) -- --

V5MIXER #36BE6 APPROX

0 0 6.3 AC 250 84 0 -- __

V6IF AMP.6BA6

0 0 6.3 AC 0 240 83 1.0 -- __

V7IF AMP.6B A6

0 0 6.3 AC 0 230 82 1.0 -- --

V8DET. AVC6BV8

5 0 235 0 -- -.24 0 0 -4

V9PROD DET12AU7

220(SSB) 0 7.0(SSB) 6.3 AC 6.3 AC 100(SSB) 0 7.0(SSB) 0

V10LIMITER6AL5

36(OFF).24(MAX)

30(OFF)0(MAX)

0 6.3 AC36(OFF).24(MAX)

030(OFF)0(MAX)

-- --

V11CAL.6BZ6

-60(CAL)APPROX

9.0(CAL) 6.3 AC 0 75(CAL) 88(CAL) 9.0(CAL) -- --

V12 HF OSC6C4

.

130 -- 6.3 AC 0 130 -6.0 0 -- __

V13BFO METER12AU7 80 0 3.7 6.3 AC 6.3 AC 200(SSB) 125(SSB) 125(SSB) 0

V14 VOLT.REG.0A2

150 -- -- -- 150 -- -- -- --

V15RECT.5U4 -GB

6.3 ACTIE PT.

260 -- 253 AC245

TIE PT.253 AC

117 ACTIE PT.

260 --

V16 AF AVC6AV6

0 1.3 6.3 AC 0 0 0 115 -- --

V17POWER AMP6AQ5

0 13 6.3 AC 0 275 250 -- -- --

V18 IF GATE68A6

0 0 6.3 AC 0 1400

88(IMC).02

4(IMC)-- --

--..,

HQ - 180- X ETABLE 2. TUBE SOCKET RESISTANCES

Measured with VT Ohmeter; Power Plug and Antenna Disconnected; Unless otherwise specified, Band and Dial 10 MC, AM, AVC OFF,3 KC Both Sidebands, Rec., Limiter OFF, RF Gain Max., AF Gain Min.

TUBESOCKET PIN NUMBERS

1 2 3 4 5 6 7 8 9

VI RF6BZ6 480K 80 RF

1.17K(MIN)-- 0 19K 44K 0 -- __

V2 MIXER #16BE6 47K 160 0 -- 21K 25K 0 -- --

V3MIXER #26BE6

100K 470 0 -- 21K 45KINF(1MC)

1.8 -- --

V4IF AMP6BA6 1.1 MEG 0 -- 0 19K 33K 180 RF

10K(MIN) -- --

V5 MIXER #36BE6 22K .8 0 -- 22K 44K 1.2 MEG -- --

V6 IBA6MPF A;

1.47 MEG 0 -- 0 19K 61K 68 -- --

V7tBA6 470K 0 -- 0 20K 60K 68 -- --

V8DET. AVC68V8 560 17 30K 0 -- 47K 70 0 4.7K

V9 ROD DETPROD1

INF20K( 470K 820 -- -- 55K 100K 820 0

y10 LIMITER6AL5 210K 1.4 MEG

200K(LIM ON)0 -- 220K 0

1.5 MEG470K(LIM ON) -- --

VII CAL.6BZ6 470K 4.7K -- 0

INF500K(CAL)

INF110K(CAL) 4.7K -- __

V12 HF6C4OSC. 24K -- - 0 24K 100K 27 -- --

V13 BFO METER12AU7 17K 0 1K __ __ INF

20K(SSB)545K 47K 0

V14 VOLT.REG.0A2 24K -- -- -- 24K -- 0

V15 RECT.--5U4-GB 20K -- 28

21KTIE PT. 30

AC LINETIE PT. 20K --

V16 AF AVC6AV6 50 APPROX 5.6K -- 0 235K 235K 540K -- --

V17 POWER AMP.6AQ5 500K 430 -- 0 22K 21K 500K -- --

V18 IF GATE68A6

1.1 MEG 0 -- 0 21K INF61K(1MC) 1K -- --

HQ-180-XETABLE 1. TUBE SOCKET VOLTAGES

Measured with VTVM; 117 Line Volts, No Antenna; Unless otherwise specified, Band and Dial 10 MC, AM, AVC OFF, 3KCBoth Sidebands, Rec., Limiter OFF, RF Gain Max., AF Gain Min.

TUBE

SOCKET PIN NUMBERS1 2 3 4 5 6 7 8 9

VI RF6BZ6

015.8(MI.5RF

N)6.3 AC 0 245 105 0 -- --

V2 MIXERAPPDX#1 -2.8 1.35 0 6.3 AC 245 110 0 -- --

V36BE6MIXER

#2APPROX 2 0 6.3 AC 140 0(174 MC) 0 __ __

V4IF AMP.6BA6

0 0 6.3 AC 0 245 110RF2.1__

29(MIN)__

V56BE6MIXER

#3 -7.4APP ROX

0 0 6.3 AC 250 84 0 -- --

V6IF AMP.6BA6

0 0 6.3 AC 0 240 83 1.0 -- --

V7IF AMP.68A6

0 0 6.3 AC 0 230 82 1.0 -- --

V8DET. AVC6BV8

5 0 235 0 -- -.24 0 0 -4

V9PROD DET12AU7

220(SSB) 0 7.0(SSB) 6.3 AC 6.3 AC 100(SSB) 0 7.0(SSB) 0

V10LIMITER6AL5

36(OFF).24(MAX)

30(OFF)0(MAX)

0 63 AC.

36(OFF).24(MAX)

030(OFF)0(MAX) -- --

VIICAL.6BZ6

-60(CAL)APPROX 9.0(CAL) 6.3 AC 0 75(CAL) 88(CAL) 9.0(CAL) -- --

V12 HF6C4OSC.

130 -- 6.3 AC 0 130 -6.0 0 -- __

V13BFO METER12AU7 80 0 3.7 6.3 AC 6.3 AC 200(SSB) 125(SSB) 125(SSB) 0

V14VOLT.REG.0A2

150 -- -- -- 150 -- -- -- --

V15RECT.5U4-GB

6.3 ACTIE PT.

260 -- 253 AC245

TIE PT.253 AC

117 ACTIE PT.

260 --

V16AF AVC6AV6

0 1.3 6.3 AC 0 0 0 115 -- --

vI7POWER AMP6A Q5

0 13 6.3 AC 0 275 250 -- -- --

V18IF GATE68A6

0 0 6.3 AC 0 1400

88(IMC).02

4(IMC)__ __

HQ

-180-ATABLE 1

TUBE SOCKET VOLTAGES

MEASURED WITH VTVM; 117 LINE VOLTS; NO ANTENNA; UNLESS OTHERWISE SPECIFIED, BAND AND DIAL10 MC, AM, AVC OFF,

3 KC BOTH SIDEBANDS, REC., LIMITER OFF, RF GAIN MAX., AF GAIN MIN.

TUBE

SOCKET PIN NUMBERS

12

34

56

78

9

V1

RF

613z6

01.5 RF

5.8 (min)

6.3 AC

0245

105

0--

--

V2Mixer #1

6BE6

-2.8

approx.

1.35

06.3 AC

245

110

0--

--

V3

Mixer #2

6BE6

-2.4

approx.

20

6.3 AC

250

74

0 (1 mc)

0--

--

V4IF Amp

6BA6

00

6.3 AC

0245

110

2.1 RF

29 (min)

--

--

V5

Mixer #3

6BE6

-7.4

approx.

00

6.3 AC

250

84

o--

--

V6IF Amp

6BA6

00

6.3 AC

0240

83

1.0

--

--

V7

IF Amp

6BA6

00

6.3 AC

0230

82

1.0

--

--

V8DET AVC

613v8

50

235

0__

-.24

00

-4

V9

Prod Det

12AU7

220 (SSB)

07.0 (SSB)

6.3 AC

6.3 AC

100 (SSB)

07.0 (SSB)

0

v10

Limiter

6AL5

3(omaxff)

.64(2)

300

mrax fil

06.3 AC

36 tc'fq

.24 max)

0300 (max)

V11

Cal

6Bz6

-60 (cal)

approx.

9.0 (cal)

6.3 AC

075 (cal)

88 (cal)

9.0 (cal)

--

--

V12

HF Osc.

6C4

130

--

6.3 AC

0130

-6.o

0--

--

V13

BFO Meter

12AU7

80

03.7

6.3 AC

6.3 AC

200 (SSB)

125 (SSB)

125 (SSB)

0

V14

Volt. Reg.

0A2

150

--

--

--

150

--

--

--

--

V15

AF AVC

6AV6

01.3

6.3 AC

00

0115

--

--

V16

Power Amp

6AQ5

013

6.3 AC

0275

250

--

--

--

Vi_7

IF Gate

6BA6

00

6.3 AC

0250

0

88 (1 mc)

02

4mc)

--

--

Systems

Socket

0A.V.C.

105

105

00

06.3 V.A.C.

--

Ace

Socket

00

300 v

D.C.

6.3

V.A.C.

--

--

--

--

--

HQ

-180-ATABLE 2

TUBE SOCKET RESISTANCES

MEASURED WITH VT OHMETER; POWER PLUG AND ANTENNA DISCONNECTED; UNLESS OTHERWISE SPECIFIED, BAND AND DIAL

10 MC, AM, AVC OFF, 3 KC BOTH SIDEBANDS, REC., LIMITER OFF, RF GAIN MAX., AF GAIN MIN.

TUBE

SOCKET PIN NUMBERS

12

34

56

78

9

V1

RF6BZ6

480K

11

RFmin)

.78oK

(

__

019K

44K

0--

__

V2Mixer #1

6BE6

47K

160

0--

21K

25K

0--

__

V3

Mixer #2

6BE6

100K

470

0--

21K

45K

Inf (1 mc)

1.8

--

__

V4

IF

6131%6Amp

1.1 meg

0--

019K

33K

180

10K

(min)

V5

Mixer #3

6BE6

22K

.8

0--

22K

44K

1.2 MEG

--

--

V6IF Amp

6BA6

1.47 MEG

0--

019K

61K

68

--

--

V7

IF Amp

6BA6

470K

0--

020K

60K

68

--

--

V8

Det. AVC

6BV8

560

17

30K

0--

47K

70

04.7K

V9

Prod Det

12AU7

INF

20K (SSB)

470K

820

--

--

55K

100K

820

0

V10

Limiter

6AL5

210K

1.4 MEG

200K (LIM ON)

0--

220K

01.5 MEG

470K (LIM ON)

--

V11

Cal.

6BZ6

470K

4.7K

--

0INF

500K (CAL)

INF

110K (CAL)

4.7K

--

--

V12

HF Osc

6c4

24K

--

--

024K

100K

27

--

--

V13

BFO Meter

12AU7

17K

0INF

20K (SSB)

545K

47K

0

V14

Volt. Reg.

0A2

24K

--

--

--

24K

--

o--

__

V15

AF AVC

6AV6

50 Approx.

5.6K

--

0235K

235K

540K

--

--

V16

Power Amp

6AQ5

500K

430

--

022K

21K

500K

--

--

V17

IF Gate

6BA6

1.1 MEG

0--

021K

IF

61NK

(MC)

1K

--

--

Systems Socket

02.2 MEG

B +

20K

B +

20K

0co

00

Ace Socket

0oo

B +

20K

0

HQ

-180 -AX

TABLE 1

TUBE SOCKET VOLTAGES

MEASURED WITH VTVM; 117 LINE VOLTS; NO ANTENNA; UNLESS OTHERWISE SPECIFIED, BANDAND DIAL 10 MC, AM, AVC OFF,

3 KC BOTH SIDEBANDS, REC., LIMITER OFF, RF GAIN MAX., AF GAIN MIN.

TUBE

SOCKET PIN NUMBERS

12

34

56

78

9

V1

RF6BZ6

01.5 RF

5.8 (min)

6.3 AC

0245

105

0--

__

V2Mixer #1

6BE6

-2.8

approx.

1.35

06.3 AC

245

110

0--

--

V3

Mixer #2

6BE6

-2.4

approx.

20

6.3 AC

250

74

0 (1 mc)

0--

--

V4IF Amp

6BA6

00

6.3 AC

0245

110

2.1 RF

29 (min)

--

--

V5

Mixer #3

6BE6

-7.4

approx.

00

6.3 AC

250

84

0--

--

V6IF Amp

6BA6

00

6.3 AC

0240

83

1.0

--

--

V7

IF Amp

6BA6

00

6.3 AC

0230

82

1.0

--

--

V8DET AVC

6BV8

50

235

0--

-.24

00

-4

V9

Prod Det

12AU7

220 (SSB)

07.0 (SSB)

6.3 AC

6.3 AC

100 (SSB)

07.0 (SSB)

0

V10

Limiter

6AL5

36 (off)

.24 (max)

30

off

0max

06.3 AC

36

(oil

.24

(max)

030 (off)

0max)

__

__

V11

Cal

6Bz6

-60 (cal)

approx.

9.0 (cal)

6.3 AC

075 (cal)

88 (cal)

9.0 (cal)

--

--

V12

HF Osc.

6c4

130

--

6.3 AC

0130

-6.o

o--

--

V13

BFO Meter

12AU7

8o

03.7

6.3 AC

6.3 AC

200 (SSB)

125 (SSB)

125 (SSB)

0

V;4

Volt. Reg.

0A2

150

--

--

--

150

--

--

--

--

V15

AF AVC

6AV6

01.3

6.3 AC

00

0115

--

--

V16

Power Amp

6AQ5

013

6.3 AC

0275

250

--

--

--

V7 1

IF Gate

6BA6

00

6.3 AC

0250

0

88 (1 mc)

02mc)

4 4

--

--

Systems

Socket

0A.V.C.

105

105

00

06.3 V.A.C.

--

Ace

Socket

00

300 v

D.C.

6.3

V.A.C.

__

--

--

--

--

V20

6CW4 crystal dsc* Pin 2

78V+, Pin 4

8.6V-, Pin 8

.o8w, Pin 10

6.3V AC

'Readings taken with switch in crystal position with 3 MC crystal in use.

HQ

-180 -AX

TABLE 2

TUBE SOCKET RESISTANCES

MEASURED WITH VT OHMETER; POWER PLUG AND ANTENNA DISCONNECTED; UNLESS OTHERWISE SPECIFIED, BAND AND DIAL

10 MC, AM, AVC OFF, 3 KC BOTH SIDEBANDS, REC., LIMITER OFF, RF GAIN MAX., AF GAIN MIN.

TUBE

SOCKET PIN NUMBERS

12

34

56

78

9

V1

RF6BZ6

480K

18.7K

(

10 RFmin)

__

019K

44K

0--

_-

V2Mixer #1

6BE6

47K

160

0--

21K

25K

0--

--

V3

Mixer #2

6BE6

100K

470

0--

21K

45K

Inf (1 mc)

1.8

--

_-

V4

IF A

6BA6mp

1.1 meg

0--

019K

33K

180 RF

10K (min)

--

--

V5

Mixer #3

6BE6

22K

.8

0--

22K

44K

1.2 MEG

--

--

V6IF Amp

6BA6

1.47 MEG

0--

019K

61K

68

--

--

V7

IF Amp

6BA6

470K

0--

020K

60K

68

--

--

V8Det. AVC

613v8

560

17

30K

0--

47K

70

04.7K

V9

Prod Det

12AU7

INF

\

20K (SSB)

470K

820

--

--

55K

100K

820

0

V10

Limiter

6AL5

210K

1.4 MEG

200K (LIM ON)

0--

220K

01.5 MEG

470K (LIM ON)

--

- -

V11

Cal.

6Bz6

470K

4 .7K

--

0INF

500K (CAL)

INF

110K (CAL)

4.7K

__

__

V12

HF Osc

6C4

24K

--

--

024K

100K

27

--

--

V13

BFO Meter

12AU7

17K

01K

--

---

INF

20K (SSB)

545K

47K

0

V14

Volt. Reg.

0A2

24K

--

--

--

24K

--

0__

__

V15

AF AVC

6Av6

50 Approx.

5.6K

--

0235K

235K

540K

--

--

V16

Power Amp

6AQ5

500K

'

430

--

022K

21K

500K

--

--

V17

IF6BA6 Gate

1.1 MEG

0--

021K

INF

61K (MC)

1K

--

__

Systems Socket

02.2 MEG

B +

20K

B +

20K

0co

00

Ace Socket

0OD

B +

20K

0

VPin 2

70K, Pin 4

100K, Pin 8

Infinity, Pin 10

.4 ohms

20

SCHEMATICDESIGNATION

Cl, A -CC2, A -IC3,C8,C31,C51, C157C4,C5,C6,C7,C9,028C10, C11, C15, C17,C18, C21, C32,C41, C47, C75, C76,C124, C130, C133,C135, C139, C141, C152C12, C33, C36, C38,C40, C46, C136, C137C13,C89,C97,C111C113, C120, C123C14C16, C93, C101C103,C114C19, C20, C85C22, C27C23C24C25C26C28, C104, C110, C115C117, C122

PARTS LIST HQ -180

DESCRIPTION

CAPACITORS

HAMMARLUNDPART NO.

Variable, Main TuningVariable, Band Spread TuningFixed, Silver -Dur Mica DM -15 100 mmf, 500 W. V.D.0 .

Fixed, Ceramic Disc . 01 mfd, 600 W. V. D. C.

Fixed, Ceramic Disc .02 mfd, 600 W. V. D. C .

Fixed, Silver - Dur Mica DM -15 20 mmf, 500 W. V. D. C .

Fixed, Silver - Dur Mica DM -15 560 mmf, 500 W. V.D.C.Fixed, Silver -Dur Mica DM -15 3 mmf, 500 W. V. D. C.

T41604 -G1T41604 -G2K23006-1M23034-19

M23034-9

K23006-17

K23027-6K23006-18

Fixed, Ceramic Disc, .04 mfd, 600 W. W.V.D.C. K23034-12Fixed, Ceramic Disc, .01 mfd, 10%, 1000 W. V. D. C. K23034-25Fixed, Silver -Dur Mica DM -15, 15 mmf,3 00 W. V. D. C K23006-35Fixed, Silver -Dur Mica DM -15, 1200 mmf, 500 W. V.D. C. K23027-4Fixed, Mylar, .033 mfd, 200 W. V. D. C . K23044-1Variable, Slot Tuning K42041-1Fixed, Silver -Dur Mica DM -15, 7 mmf, 500 W. V. D. C. K23006-24

C29 Fixed, Silver - Dur Mica DM -15, 780 mmf, 500 W. V. D. C. K23006-39C30, C63, C64, C78,C 143 Fixed, Silver-Dur Mica DM -15, 47 mmf, 300 W. V. D. C K23006-47C34, C37 Fixed, Silver -Dur Mica DM -15, 24 mmf, 500 W. V. D. C. K23006-7C35 Fixed, Ceramic Disc, Temp. Comp. 330N750 K23010-9C39, C42 Fixed, Ceramic Disc, 500 mmf, 1000 W. V.D.C. K23034-13C43 Fixed, Silver - Dur Mica DM -15, 10 mmf, 500 W. V.D.C. K23006-8C44, C45 Fixed, Ceramic Disc, .002 mfd, 1000 W. V. D. C. M23034-18C48, C87, C131 Fixed, Dur-Paper, .1 mfd, 200 W. V. D. C.C49, C95, C105 Fixed, Dur-Paper, .047 mfd, 400 W. V. D. C.C50 Variable, Calibrator, 8-50 mmfC52 Variable, Antenna TuningC53,C54,C55, Variable, Mica Trimmer, 1.5 - 20 mmfC56, C57, C58C59C60C61062C65C66

Fixed, Ceramic Disc. Temp. Comp. 27N470Fixed, Ceramic Disc. Temp. Comp. 27N220Fixed, Ceramic Disc, Temp. Comp. 27N470Fixed, Ceramic Disc. Temp. Comp. 27N750Fixed, Silver - Dur Mica DM -15, 60 mmf,300 W. V.D.C.Fixed, Silver - Dur Mica DM -15, 85 mmf, 500 W. V. D. C.

K23045-3K23045-2K23038-5K34454 -G24K23043-6

K23010-26K23010-25K23010-23K23010-24K-23006-51K23006-3

- 67 -

SCHEMATIC HAMMAR LUNDDESIGNATION DESCRIPTION PART NO.

C 67C68, C80C 69C70C71C72C73C74C77C79C81C82, A -DC83, C84C86, C94C88, C90, 096, C98C91, C99C92, C100C102, C109, 0118,0153C154, 0155C1060107, 0116C108, C119C112, C121C125C126, C127C128C129C132C134C138C140C142C144,C145,C146C147, C148, C149C150C151C156

CMCCMCM1Y1Y2Y3Z1Z2

Fixed, Silver - Dur Mica DM -15, 150 mmf, 300 W. V. D. C .Fixed, Silver - Dur Mica DM -15, 220 mmf, 500 W. V. D. C.Fixed, Silver -Dur Mica DM -15, 180 mmf, 300 W. V.D. C.Fixed, Silver - Dur Mica DM -15, 333 mmf, 300 W. V. D. C.Fixed, Silver - Dur Mica DM -15, 673 mmf, 300 W. V. D. C.Fixed, Silver - Dur Mica DM -15, 1030 mmf, 300 W. V. D. C.Fixed, Silver - Dur Mica DM -15, 363 mmf, 300 W. V. D.C.Fixed, Silver - Dur Mica DM -15, 438 mmf, 300 W. V. D. CFixed, Ceramic Disc, Temp. Comp. 100N470Variable, Crystal Phasing 1.5-9.1 mmfFixed, Silver - Dur Mica DM -15, 1000 mmf, 300 W. V. D.C.Fixed, Electrolytic, 60-40-40-40 mfdFixed, Ceramic Disc, . 01 mfd, 1400 W. V. D. CFixed, Silver - Dur Mica DM -15, 31 mmf, 500 W.V. D.C.Fixed, Silver - Dur Mica DM -15, 29 mmf, 500 W. V . D . C.Fixed, Silver - Dur Mica DM -15, 28 mmf, 500 W. V. D CFixed, Silver - Dur Mica DM -15, 27 mmf, 500 W. V . D. C.Fixed, Silver -Dur Mica DM -15, 9 mmf, 500 W. V.D. C.

Fixed, Silver -Dur Mica DM -15, 10 mmf, 500 W. V.D. CFixed, Silver - Dur Mica DM -15, 14 mmf, 500 W. V.D.C.Fixed, Silver - Dur Mica DM -15, 21 mmf, 500 W. V. D. C .Fixed, Silver - Dur Mica DM -15, 16 mmf, 500 W. V. D. C .Fixed, - Dur -15, 47 mmf, 500 W. V . D. C .Fixed, Mylar, .01 mfd, 400 W. V.D.C.Fixed, Ceramic Disc, .001 mfd, 500 W. V.D. C.Variable, BFO, 100 mmfFixed, Ceramic Disc, .005 mfd, 1000 W. V.D. C.Fixed, Silver - Dur Mica DM -15, 2 mmf, 500 W.V. D. C .Fixed, Ceramic Temp. Comp. 47N750Fixed, electrolytic, 20 mfd, 25 W. V.D. C.Fixed, Ceramic Disc, Temp. Comp. 440N750Variable, Cylindrical Trimmer, 1-8 mmf

Fixed, Ceramic Disc, Temp. Comp. 110N750Fixed, Ceramic Disc, Temp. Comp. 500N1500Variable, Vernier Tuning 24uuf

SPECIAL ASSEMBLIES

Crystal panel, clock windowClock, Telechron auto -timer (CO cycle operation)Clock, Telechron auto -timer (50 cycle operation)Meter "S" (carrier level)Quartz crystal, 2.580 McsQuartz crystal, 100.0 KcsCrystal 3035 KcsRC printed network (Calibrator)RC printed network (Audio)

K23006-53K23006-10K23006-30K23006-61K23006-57K23027-19K23006-76K23006-75K23010-30K23057-1K23027-9K15504-71K23034-26K23006-15K23006-16K23006-19K23006-20K23006-21

K23006-22K23006-25K23006-26K23006-23K23006-6K23044-2K2304-30K11730-39M23034-10K23006-37K23061 -26JK23091-1K23010-27K23008-2

K23010-5K23010-29K42187 -G1

M38877-1K38874 -G2K38874 -G3K-28149-5K38972-2K38661-1K26481-1K38981-1K38846-1

- 68 -

SCHEMATIC HAMMARLUNDDESIGNATION DESCRIPTION PART NO.

Ll, L9, L10L2L3L4L5, L7, L8L6

R1, R16, R41, R82, R95R2,R9,R12,R17, R47, R62, R99R3, R57R4R5, R14, R80R6

COILS

RF Choke, 2.5 millihenryBifilar CoilSlot Filter CoilPassband Tuning CoilRF Choke, 330 millihenriesFilter Choke, 8.0 henries

RESISTORS

10K ohms, 1/2 w., 10%1K ohms, 1/2 w., 10%

6.8K ohms, 1/2 w., 10%10 ohms, 1/2 w. , 10%180 ohms, 1/2 w.,Variable, 1.5K ohms, dual with R15 and

R7,R42,R49,R65,R70 47K ohms, 1/2 w., 10%R72, R73, R75, R84, R10)R8 160 ohms, 1/2 w.,R10,R13,R18,R27,R36 100K ohms, 1/2 w., 10%R40, R51, R74, R106, R107R11, R29, R97, R101 22K ohms, 1/2 w., 10%R15R19R20R21R22R23, R44R24R25R26R28, R43, R45,R48, R68, R71R30, R32, R37, R46, R76 470KR85, R91, R93, R104R31, R33R34R35R39R50R52R53R54R55R56R58

Variable, 10K ohms, part of R6Variable, 1.5K ohms, meter sens. adj.Variable, 300 ohms, meter zero adj.22K ohms, 1 w., 10%820 ohms, 1/2 w.,1 megohm, 1/2 w., 10%120 ohms, 1/2 w.,39 ohms, 1/2 w., 5%Variable, 200 ohms, slot220K ohms, 1/2 w., 10%

ohms, 1/2 w., 10%

68 ohms, 1/2 w., 10%560 ohms, 1/2 w., 10%1K ohms, lw., 10%820 ohms, 1/2 w., 10%20 ohms, 1/2 w., 5%10 ohms, 1/2 w., 5%2K ohms, 10 w.,680 ohms, 1/2 w., 10%3K ohms, 1/2 w., 5%15K ohms, 1/2 w., 10%27K ohms, 2 w., 10%

de pth

K15627-1K42032-1K42034-1K26301-1K42019-1K26302-1

K19309-73K19309-49

K19309-69K19309-1K19309-260

S3 K38940-1K19309-89

K19309-199K19309-97

K19309-61

K15379-2K15379-1K19310-81K19309-266K19309-121K19309-258K19309-253K15368-7K19309-105

K19309-113

K19309-21K19309-43K19310-49K19309-47K19309-188K19309-246K19337-5K19309-45K19309-212

K19309-77K19304-52

- 69 -

SCHEMATICDESIGNATION

R59, R63, R69R60, R61, R66, R67R65R77R78R79R81R83R86R87, R98R88R89R90R92R94R96R102R,103R105

S1S2AS2B, CS2DS2E, S2F, S2GS3S4S5S6S7S8

T1T2T3T4,T5T6,T7,T8,T9T10, T11T12T13T14T15T16

HAMMAR LUNDDESCRIPTION PART NO.

2.2K ohms, 1/2 w. , 10%330K, ohms, 1/2 w., 10%270 ohms, 1/2 w. , 10%27 ohms, 1/2 w., 10%Variable, 500K ohms, limiter includes 61Variable, 1 megohm, audio gain1.5K, 1 w., 10%4.7 megohm, 1/2 w., 10%430 ohms, 1 w. ,

470 ohms, 1/2 w., 10%2.7K ohms, 1/2 w. , 5%6.2K ohms, 1/2 w. , 5%3.6K ohms, 1/2 w. ,

5.6K ohms, 1/2 w., 10%68 ohms, 1/2 w. , 5%4.7K ohms, 1/2 w., 10%2.2 megohm, 1/2 w., 10%13K ohms, 1 w., 10%11K ohms, 1/2 w.,

SWITCHES

Noise Limiter ON -OFF (Part of R78)Switch Wafer, Ant, primarySwitch Wafer, Ant. sec. mixer gridSwitch Wafer, RF PlateHF Oscillator Switch AssemblyAC ON -OFF (Part of R6 and R15)Send -Receive -CalibrateSelectivitySidebandAM-SSB/CWAVC

TRANSFORMERS

Transformer, Mixer Plate 3035 and 455 KCIF Transformer, Crystal GridIF Transformer, 355 KcsIF Transformer, 455 KcsIF Transformer, 60 KCS

Antenna Transformer, .54 to 1.05 McsAntenna Transformer, 1.05 to 2.05 McsAntenna Transformer, 2.05 to 4.04 McsAntenna Transformer, 4.0 to 7.85 McsAntenna Transformer, 7.85 to 15.35 Mcs

K19309-57K19309-109K19309-35K19309-11K15378-3K 26218-3K19310-53K19309-137K19310-212K19309-41K19309-272K19309-176K19309-179K19309-67K19309-256K19309-65K19309-129K19310-227K19309-215

K26472-3K26472-2K26472-1K26480-1

K26452-1K26296-1K26303-1K42037-2K26309-2

K26474-2K26473-1K38829-2K38946-1K42005-1

K26455-1K26456-1K26457-1K26458-1K26459-1

- 70 -

SCHEMATIC HAMMARLUNDDESIGNATION DESCRIPTION PART NO.

T17 Antenna Transformer, 15.35 to 30 Mcs K26460-1T19 RF Transformer, .54-1.05 and 1.05-2.05 mcs K26461-1T20 RF Transformer, 2.05-4.04 and 4.0-7.85 mcs K26462-1T21 RF Transformer, 7.85-15.35 and 15.35-30 mcs K26463-1T23 Osc Coils .54 to 1.05 and 1.05 to 2.05 mcs K26464-1T24 Osc Coil 2.05 to 4.04 Mcs K26465-1T25 Osc Coil 4.0 to 7.85 mcs K26466-1T26 Osc Coil 7.85 to 15.35 mcs K26467-1T27 Osc Coil 15.35 to 30 mcs K26468-1T28 BP0 Transformer, 60 Kcs K42005-4T29 Audio Output Transformer K38828-1T30 Power Transformer 117 V.A.C. P26305-1T3OE Power Transformer 115-230 V Export Model P26305-2

MTSCE LLANE OUS

El Fuse, holder K15923 -IFl Fuse, 3 Amp, type 3 AGC K15928-8Il, 12,13 Lamp, pilot No. 47, 6.3 V. .15A K16004-1J1 External Relay Receptacle K35013-1J2 Phone Jack K35608-1J3 Antenna Connector, SO -239 K16111-1

OPTIONAL ACCESSORIES

Telechron Clock Assembly ConversionKits including instructions for convertingmodel HQ -180 to Model HQ -180C are listedas follows:24 Hour Clock Kit (115V/230V - 50 cycles) PL26380-G324 Hour Clock Kit (115V/230V - 60 cycles) PL26380-G4Loudspeaker assembly in cabinet PL26394-G1matched to the Models HQ -180, HQ -180Cand HQ -180E

- 71 -

SCHEMATICDESIGNATION

ADDENDA TO PARTS LISTFOR HQ-180XE

DESCRIPTION

C158 Cap Fixed, Electrolytic, 200 mfd, 25V DC NPC159 Cap Fixed, Dur-Mica DM -15, 25 mmf = 5%, 500V0160 Cap Fixed, Ceramic Disc, .005 mfd -80- 20%, 500VCR1 Diode, Silicon (in 1490)K1 Relay, AmpsR108 Res, 100K ohms, 1/2 w., 10%R109 Res. 62K ohms, 1/2 w. , = 5%R110 Res. 16K ohms, 1/2 w.,R111 Res. 22 ohms, 1 w., = 10%S9 Switch, Crystal Selector

SC HE MATICDESIGNATION

CR2, CR3Fl

,T1

J4S2E,F,GS7T18T22T29C161

SCHEMATICDESIGNATION

CR2, CR3Fl

J1J4S2E,F,GS7T18T22T29C161

ADDENDA TO PARTS LI61'FOR HQ -180A

DESCRIPTION

Rectifier, Silicon (CER72C) 800 PIV, 255Fuse, 1-1/2 Amp Type 3 AGC for 50-60 Cycles

230V operationSocket (8 pin) (System Socket)Connector Female (Accessory SocketHF Oscillator Switch Assem.Switch (AM-SSB-CW)Power TransformerFilament TransformerOutput TransformerCapacitor, Fixed, Dur-Mica DM -15, 47 mmf, 300V

ADDENDA TO PARTS LISTFOR HQ-180AX

DESCRLPTION

Rectifier, Silicon (CER72C) 800 PIV, 255Fuse 1-1/2 Amp Type 3 AGC for 50-60 Cycles

230V OperationSocket (8 pin) (System Socket)Connector Female (Accessory Socket)HF Oscillator Switch Assem.Switch (AM-SSB-CW)Power TransformerFilament TransformerOutput TransformerCapacitor, Fixed, Dur-Mica DM -15, 47 mmf, 300V

HAMMAR LUNDPART NO.

K23925-1K22006-142M23034-37K41212-1K40404-1K19309-97K19309-183K19309-217K19310-9K39145-1

HAMMARLUNDPART NO,

M41215-3

K15928-6K16083-1K41138-1K26480-1K52033-1P26305-4K39224-2K38828-2K23006-47

HAMMAR LUNDPART NO,

M41215-3

K15928-6K16083-1K41138-1K26480-1K52033-1P26305-4K39224-2K38828-2K23006-47

- 72 -

P

THESE POINTS MUSTRED - BLACK BE SOLDERED

BLACK -RED --BLACK-BLACK- GREEN

R F& ON -OF

---YELLOW - BLACK

POWER TRANS.

BLACK -YELLOW

RED- -BLACK

e---AFUSE

C A C LINE

BLACK -WHITE

DOTTED LINEINDICATES PRE-SENT CONNECTION.REMOVE WHENINSTALLINGCLOCK WIRES

BLACK -WHITE

YELLOW- BLACK

CLOCK INSTALLATION HQ -170 a HQ -I80115V 50 OR 60f\-,

L _ _ - - - -RED BLACK THESE POINTS MUST

- I" BE SOLDERED

BLACK -RED -BLACK-BLACK-GREEN

O

R FEt ON -OFF

_J

POWER TRANS.

RED -BLACK

BLACK -YELLOW

743 FUSE

A C. LINE

YELLOW -BLACK

RESISTOR44002 OW± 5 %(SEE NOTE)

BLACK -WHITE

DOTTED LINEINDICATES PRE-SENT CONNECTION.REMOVE WHENINSTALLINGCLOCK WIRES

BLACK -WHrTE

YELLOW- BLACK

NOTE THE 4 4 00.rL RESISTORMUST BE JUMPED ORSHORT-CIRCUITED FOR115 -117 VOLTOPERATION .

CLOCK INSTALLATION HQ -170 a HQ -I80230V 50 OR 60 f'.)

4PUSH- TO- TALK

H X- 50 TRANSMITTER HQ -180A RECEIVER

l. ACCESSORY INSULATED0 VOX RELAY CONTACTS

RATED I AMP- 230V AC

L

JI05o

OC)o

oJI04

rREC ANT

TBIO

I 2 3 4oee®40-80nRF OUTPUT

5 6 7i®®®°NORMALLY

OPEN

SPEAKER

0

SHIELDED CABLE

ACCESS

B+SOCKET

METER ADJ

SENS ZERO

FIL GND

ANT0 0

0

ANT

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0®®0

BLUE

0

FUSE

GRID BLOCK BIAS GRN

SEE NOTE 2

3 2n.

ORN

YEL

SYSTEMSOCKET

o2 eo

03 Q 7o

WH

500 A RED

GROUND BLK

NOTESI HOOK-UP SHOWN IS USING GRID BLOCK BIAS TO THE HO- 180 -AX2 IF RELAY SWITCHING IS DESIRED

a DISCONNECT GRID BLOCK BIAS (GREEN LEAD) FROM PIN 5 OF TB101b WIRE ORANGE LEAD TO PIN 7 AND YELLOW LEAD TO PIN 6

3 IF GRID BLOCK BIAS IS USED, RELAY CONTACTS PINS 6 & 7 ON HX-50MAY BE USED FOR OTHER FUNCTIONS THESE ARE NORMALLY CLOSED.

SUGGESTED INTERCONNECTIONS(HX-50 HQ -I80 -AX)

63V BRN

4 WHEN USING VOX CONTROL OF THE HX-50 TRANSMITTER,PIN NO. I OF THE HO -180A OR H0+80AX RECEIVERS SYSTEMSOCKET SHOULD BE CONNECTED TO PIN NO.3 OF HX-50TERMINAL BOARD AS SHOWN IN DIAGRAM

VI6826

RF AMP

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OlUF1643 R462205 4706 NOISE

LIMITER

9441MEG

R4

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R76 5005

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2 UPPER S5 IN 55C POS AND S6 M POS3 BOTH

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ADDENDUMTO

TECHNICAL DESCRIPTION AND OPERATING INSTRUCTION MANUAL NO.52787-1HC -180 SERIES COMMUNICATIONS RECEIVERS

Page 8 and Page 26Change Crystal Frequency Chart to read as follows:

SIGNAL FREQUENCYRange mc

1.80 to 2.052.05 to 4.04.0 to 7.857.85 to 15.3515.35 to 20.66220.662 to 30.0

ADD IF---- SUBSTRACT IF---- MODE OFFrequency mc Frequency mc OPERATION

.455000

. 455000

. 4550003.0353.035

3.035

FundamentalFundamentalFundamentalFundamentalFundamental2nd Harmonic

Page 30Make the following change to the Detector, BFO and Noise Limiter Circuit Diagram:

1. Capacitor C124 was connected from junction of R73 and R74 to junction ofR72 and R74. This capacitor (C124) is now connected from junction of R72and R74 to ground.

1.2.3.4.5.6.7.8.9.

10.11.12.13.

ChangeChangeChangeChangeChangeChangeChangeChangeChangeChangeChange

CHANGES TO HQ -180A SCHEMATIC DIAGRAM

resistor R3 from 6.8K +10%, 1/2W to 6.8K +10%, 1W.resistor R19 from 1.5K +10%, 1/2W to 1.5K +30%, 1/2W.resistor R20 from 300 SZ +10%, 1/2W to 1.5K +30%, 1/2W.resistor R.22 from 820 0+5%, 1/2W to 470 C2, +10%, 1/2W.resistor R33 from 68 SZ 1/2W to 390 S-2,÷5%, 1/2W.resistor R47 from 1K +10% to 2. 2K +10%.resistor R53 from 2K 10W, to 4K +10%, 10W.resistor R61 from 330K n, 1/2W to 820K n 1 /2W.resistor R67 from 330K SZ , 1/2W to 820K C2 1 /2W.resistor R88 from 2700 +5%, 1/2W to 2.7K +10%, 1/2W.resistor R99 from 1K +10%, 1/2W to 2.2K +10%, 1/2W.

Delete capacitor C6 .01 mf.Add capacitor C158 .01 mf, from pin 7 of V17 (6BA6) to ground.

CHANGES TO PARTS LIST

Page 67

1. Delete capacitor C6 .01 mf 600V.

Page 68

1. Add capacitor C158 .01 mf 600V.

HAMMAR LUNDPART NO.

1509-01-01011

1509-01-01011

-1- Addendum No. 9001-15-00001

Page 69

1. Change resistor R3 to read 6.8K ±10%, 1W.2. Change resistor R19 to read Variable, Meter Sens. Adj. ,

1.5K ±30%, 1/2 W.3. Change resistor R20 to read 1.5K ±30%, 1/2W.

4704-01-006424735-01-00404

4735-01-004044. Change resistor R22 to read 470 S2,±10%, 1/2W. 4703-01-003285. Change resistor R33 to read 390 sn-±5%, 1/2W. 4703-02-004376. Change resistor R47 to read 2.2K ±-10%, 1/2W. 4703-01-003367. Change resistor R53 to read 4K a -Ida, 10W. 4714-01-010028. Change resistor R99 to read 2.2K +10%, 1/2W. 4703-01-00336

Page 70

1. Change resistor R88 to read 2.7K +10%, 1/2W. 4703-01-003372. Change resistor R61 to read 820K S2_, ±10%, 1/2W. 4703-01-003673. Change resistor R67 to read 820K ±10%, 1/2W. 4703-01-00367

It has been found on the HQ -180A Series Communications Receivers thatthe tubes will have longer life with the tube shields removed. Therefore, the tubeshields on tubes V1, V4, V6, V7, V10, V16 and V18 have been eliminated.

Also, after extensive environmental testing, it was found that under certainconditions the plastic dust covers for the main tuning and bandspread capacitorsserved very little useful purpose and in some cases caused system degradation.These dust covers and tube shields have been eliminated on all present and futureproduction runs of the HQ -180A Series Communications Receivers and do not ap-pear on the receiver as shown in the illustration of the top view of the chassis inthe present manual.

Starting with the present production units, the clock installation drawingson Page 73 and 74 are no longer required. The clock is now furnished with a pre -wired program plug as shown on the HQ -180A Schematic diagram.

-2-

.

THE HAMMARLUND MANUFACTURING COMPANYStandard Warranty

The Hammarlund Manufacturing Company, warrants this equipment to be free from defectsin workmanship and materials under normal and proper use and service for the uses andpurposes for which it is designed, and agrees to repair or replace, without charge, all partsthereof showing such defects which are returned for inspection to the Company's factory,transportation prepaid, within a period of 90 days from date of delivery, provided such inspec-tion discloses to the satisfaction of the Company that the defects are as claimed, and providedalso, that the equipment has not been altered, repaired, subjected to misuse, negligence oraccident, or damaged by lightning, ex:essive current or otherwise, or had its serial number orany part thereof altered, defaced, or removed. Tubes shall be deemed to be covered by themanufacturer's standard warranty applicable thereto, and such items shall be and are herebyexcluded from the provisions of this warranty. Pilot lamps and fuses are not guaranteed forlength of service.Except as herein specifically provided, no warranty, express or implied, other than that oftitle, shall apply to any equipment sold hereunder. In no event shall the Company be liablefor damages by reason of the failure of the equipment to function properly or for anyconsequential damages.This Warranty is valid for the original owner of the equipment, and is contingent upon receiptof the Warranty Registration Card by the Company. No equipment shall be returned to thefactory for repairs under warranty unless written authorization is obtained by the Company,and the equipment is shipped prepaid by the owner. The Company maintains AuthorizedService Stations, names and location; of which will be sent upon request of the owner.

HAMMARLUND MANUFACTURING COMPANY, INC.A Giannini Scientific Co.

ri e... 73-88 Hammarlund Drive, Mors Hill, North CarolinaExport Department: 13 East 40th Street, New York 16, N. Y..)clir

(11.)

The policy of the Hammarlund Manufacturing Company, is one of continuedimprovement in design and manufacture wherever and whenever possible,to provide the highest attar -table quality and performance. Hence, specifica-tions, finishes, etc. are subject to change without notice and without assump-tion by Hammarlund of any obligation or responsibility to provide suchfeatures as may be changed, added or dropped from previous productionruns of this equipment.

DO NOT MAKE ANY RETURNS WITHOUT AUTHORIZATION FROMEITHER NEW YORK OFFICE OR FACTORY. ALL AUTHORIZED RETURNSSHOULD BE SHIPPED TO FACTORY, HAMMARLUND MANUFACTURINGCO., MARS HILL, NORTH CAROLINA. DO NOT SHIP TO NEW YORKOFFICE.

ESTABLISHED 1910

Printed in U.S.A.