TM 11-318DEPARTMENT TECHNICAL MANUAL

ALIGNMENTEQUIPMENT

ME 73^This is a reprint of Alignmmt^fejuipment ME 73. No distribution qjitt be made to pertonnel fjoslpsing the original publication.

DEPARTMENT

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WAR DEPARTMENT TECHNICAL MANUALT M 1 1 - 3 1 S

ALIGNMENT EQUIPMENTME 75

WAR DEPARTMENT • 30 JULY 1943

RESTRICTED. DISSEMINATION OF RESTRICTED MATTER.

No person is entitled solely by virtue of his grade or position to knowledge

or possession of classified matter. Such matter is entrusted only to those

individuals whose official duties require such knowledge or possession.

(See also paragraph 23b, AR 380-5, IS March 1944.)

U. S. Cmenmnt Printing Office

ITiukiniton : 1945

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WAE DEPARTMENTWASHINGTON 25, D. C., 30 July 1943

TM 11-318 Alignment Equipment ME 73 is published for theinformation and guidance of all concerned.

[A<! 300.7 (30 Jul 43)]

BY ORDER OF THE SECRETARY OF WAR :

OFFICIAL: G. C. MARSHALLJ. A. ULIO Chief of StaffMajor GeneralThe Adjutant General ,

t>

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RESTRICTED

TM 11—318

TECHNICAL MANUAL \^|r ^|pARTMENT

WASHINGTON, 25, D. C., 30 July, 1943

No. 11—318

ALIGNMENT EQUIPMENT ME-73

TABLE OF CONTENTS

SECTION I. DESCRIPTION PAR.

General 1

List of Components 2

Adapter RS-259 3

Crystal Holders 4

Tools 5

SECTION II. INSTALLATIONAdapter M-394 6

Adapter M-399 7

SECTION III. ALIGNMENT PROCEDURESAligning Radio Sets SCR-509-(*) and SCR-510-(*),

with Adapter M-394 installed 8

Aligning Radio Sets SCR-609-(*) and SCR-610-(*),with Adapter M-399 installed 9

SECTION IV. SUPPLEMENTARY DATATable of Replaceable Parts 10

M558565 i

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TM 11—318

LIST OF ILLUSTRATIONS

FIG. PAGE

1—Alignment Equipment ME-73, Showing ComponentParts 4

2—Adapter M-394, Top View 7

3—Adapter M-394, Bottom View 9

4—Adapter M-399, Top View 11

5—Adapter M-399, Bottom View 13

6—Adapters M-394, M-399, Adapter Plug— Method ofInserting in Receiver — Power - Amplifier - Tube

- Socket 15

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TM 11—318

DESTRUCTION NOTICE

WHY —To prevent the enemy from using or salvaging thisequipment for his benefit.

WHEN—When ordered by your commander, or when you arein immediate danger of capture.

HOW —1. Smash—Use sledges, axes, hand-axes, pick-axes,hammers, crowbars, heavy tools, etc.

2. Burn—Use gasoline, kerosene, oil, flame-throwers,incendiary grenades, etc.

3. Disposal —Bury in slit trenches, fox-holes, otherholes. Throw in streams. Scatter.

4. USE ANYTHING IMMEDIATELY AVAILABLE FOR DESTRUCTION OF THISEQUIPMENT.

WHAT— 1. Smash—The chest, the adapters, the crystal holders, and the tools.

2. Burn—The instruction books and the smashed

chest.

3. Bury or scatter —Any or all of the above pieces

after breaking.

DESTROY EVERYTHING

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TM 11—318

SIGNAL CORPS

WRENCH

ADAPTERRS- 259

:,< .

— CHEST CH-204

— SCREWDRIVER

TL-15

ALIGNMENT TOO,TL- 20?

CRYSTAL^-HOLDERS FT-24?

FIG. 1—ALIGNMENT EQUIPMENT ME-73, SHOWING COMPONENT PARTS

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 1-3

SECTION IDESCRIPTION

1. -General. —Alignment Equipment ME-73 consists of instruments and tools to be used with Adapters M-394 and M-399to adjust and align Radio Sets SCR-509-(*), SCR-510-(*),SCR-609-(*), and SCR-610-(*).

2. List of Components.—The components of Alignment Equipment M-73 are packed in Chest CH-204-(*), and the totalweight is 2 Ibs., 2 ozs. The dimensions of Chest CH-204-(*) are 6i/2 x 7^4 x 2i/2 inches.

Quantity Article Stock No.

1 Adapter RS-259 3Z591 Alignment Tool TL-2071 Chest CH-2041 Crystal Holder FT-243, with 2.88

mc. crystal1 Crystal Holder FT-243, with 4.3

mc. crystal2 Technical Manuals TM 11—318

1 Screwdriver TL-15 6R152101 Wrench, A inch

3. Adapter RS-259.— This adapter plug is used when the radioset to be aligned is powered by Battery BA-39. It plugs intothe battery and places a 500-ohm, 5-watt resistance in serieswith the high voltage lead to reduce the current to a safevalue for the alignment procedure.

NOTE: The asterisk within parentheses (*) indicates theapplicable issue letter.

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TM 11—318

4-5 SIGNAL CORPS

4. Crystal Holders. —

a. Crystal Holder FT-243 with 2.88 mc. crystal is used forchecking the discriminator circuit and for complete alignmentof Radio Sets SCR-509-(*) and SCR-510-(*). It plugs intothe crystal socket of the radio set to replace a channel crystal,and provides the required frequency for aligning the intermediate frequency stages and the discriminator.

. b. Crystal Holder FT-243 with 4.3 mc. crystal is used forchecking the discriminator circuit and for complete alignment of Radio Sets SCR-609-(*) and SCR-610-(*). It plugsinto the crystal socket of the radio set to replace a channelcrystal, and provides the required frequency for aligning the

intermediate frequency stages and the discriminator.

5. Tools.—

a. Alignment Tool TL-207 is an insulated screwdriver andwrench combination (with screwdriver rotating inside a No. (jnut size wrench) which fits the top of the trimmer capacitorsin the radio sets with which Alignment Equipment ME-73 isto be used.

b. Screwdriver TL-15 is a standard screwdriver with a

2-inch blade, 1/4 inch tip, and a length of 53/4 inches overall.It is for general use, such as opening cases of radio sets.

c. Wrench, %6-inch, fits the locknuts at the top of the trimmer capacitors in the radio sets with which Alignment Equipment ME-73 is to be used.

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 6

SECTION IIINSTALLATION

6. Adapter M-394.—

a. Description. —

(1) Adapter M-394 is used with Alignment Equipment ME-73 for aligning Radio Sets SCR-509-(*) and SCR-510-(*).

FIG. 2—ADAPTER M-394, TOP VIEW

(2) Adapter M-394, see 'Figs. 2 and 3, consists of a

metal bracket on which is mounted a terminal block and a

d.p.d.t., OFF-ALIGN, slide switch that is connected to a sepa-

652727 O - 45 - 3

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TM 11—318

6 SIGNAL CORPS

rate tube-socket-adapter plug having a metering plug lead.

The switch also is connected to the terminal block, and has

two separate leads.

(3) The bracket of Adapter M-394 is designed for permanent installation in Receiver-Transmitter BC-620-(*).When it is installed, and the connections made properly, the

adapter switch at ALIGN converts the receiver-amplifier-stage of the set into a vacuum-tube-voltmeter circuit utilizingthe panel meter of the set. This permits the changing ofchannels as well as complete alignment of the set withoutusing an external meter. With the adapter switch at OFF,Adapter M-394 does not interfere with the ordinary use ofthe set..

b. Installing Adapter M-394.—

(1) Take the receiver-transmitter from its case, by removing all the screws around the edge of the panel and pulling the chassis forward.

(2) Use a %6" open-end wrench to disconnect the twoleads attached to the panel meter of the set, and then con

nect these leads to terminals B and R of Adapter M-394,Fig. 3, attaching the red lead to R.

(3) Take the two separate leads of Adapter M-394,Fig. 3, and connect them to the meter terminals, attachingthe red lead to the meter terminal nearest transformer T6.

(4) Remove the two screws from the edge of the topcover of battery Box BX-4 that contains Battery BA-41, andmount the bracket of Adapter M-394 there, using the originalscrews.

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TM 11—318

ALIGNMENT EQUIPMENT ME-73

(5) Remove the receiver power-amplifier Tube VT-185from its socket and insert the adapter plug, as shown inFig. 6. Then insert Tube VT-185 in the adapter plug socket,

as shown.

FIG. 3—ADAPTER M-394, BOTTOM VIEW

(6) Insert the adapter metering plug in the centerhole of the metering socket, as shown in Fig. 6, and throwthe adapter switch to OFF.

(7) Replace Receiver-Transmitter BC-620-(*) in itscase, being careful to see that the gasket is properly seated.Tighten the panel screws carefully to put uniform pressureon all screws and prevent leakage through the gasket.

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TM 11—318

7 SIGNAL CORPS -

7. Adapter M-399.—

a. Description. —

(1) Adapter M-399 is used with Alignment Equipment ME-73 for aligning Radio Sets SCR-609-(*) and SCR-610-(*).

(2) Adapter M-399, see Figs. 4 and 5, consists of a

metal bracket on which is mounted a terminal block and ad.p.d.t., OFF ALIGN, slide switch that is connected to a sepa

rate tube-socket-adapter plug having a metering lead. Theswitch also is connected to the terminal block, and has twoseparate leads.

(3) The bracket of Adapter M-399 is designed forpermanent installation in Receiver-Transmitter BC-659-(*).When it is installed, and the connections made properly, theadapter switch at ALIGN converts the receiver amplifierstage of the set into a vacuum-tube-voltmeter circuit utilizing

the panel meter of the set. This permits the changing ofchannels as well as complete alignment of the set withoutusing an external meter. With the adapter switch at OFF,Adapter M-399 does not interfere with the ordinary use ofthe set.

b. Installing Adapter M-399.—

(1) Take Receiver-Transmitter BC-659-(*) from itscase, by removing all the screws around the edge of the paneland pulling the chassis forward.

(2) Use the % 6" wrench that is part of AlignmentEquipment ME-73, to disconnect the two leads attached to

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 7

the panel meter of the set, and then connect these leads toterminals B and R of Adapter M-399, Fig. 5, attaching thered lead to R.

(3) Take the two separate leads of Adapter M-399,Fig. 5, and connect them to the meter terminals, attachingthe red lead to the terminal nearest the crystal holder.

FIG. 4—ADAPTER M-399, TOP VIEW

(4) Remove the two screws from the edge of the topcover of battery Box BX-4 that contains Battery BA-41, andmount the bracket of Adapter M-399, using the originalscrews.

(5) Remove the receiver-power-amplifier Tube VT-185from its socket and insert the adapter plug, as shown in

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TM 11—318

7-8 SIGNAL CORPS

Fig. 6. Then insert Tube VT-185 in the adapter plug socket,

as shown.

(6) Insert the adapter metering plug in the centerhole of the metering socket, as shown in Fig. 6, and throwthe adapter switch to OFF.

(7) Replace Receiver-Transmitter BC-659-(*) in itscase, being careful to see that the gasket is properly seated.

Tighten the panel screws carefully to put uniform pressureon all screws to prevent leakage through the gasket.

SECTION III .

ALIGNMENT PROCEDURES

8. Aligning Radio Sets SCR-509-(*) and SCR-510-(*) withAdapter M-394 Installed.—

a. Preliminary Procedure.—

(1) Remove the chassis of Receiver-Transmitter BC-620- (*) from its case. Place the chassis on a bench and con

nect it to Plate Supply Unit PE-97-(*), or to Case CS-79-(*)with Batteries BA-39 and BA-40 installed. If Case CS-79-(*)is used, insert Adapter RS-259 that is part of AlignmentEquipment ME-73, into Battery BA-39 to protect the transmitter final amplifier tube against possible damage by highplate current.

(2) Insert the proper crystals in the crystal socket.

(3) Preset the tuning capacitors (A1 through A6, and

B! through B6), and the pins in the antenna loading coil (LJ,12

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 8

for the channels selected, using the approximate trimmer settings given in the following table :

FIG. 5—ADAPTER M-399, BOTTOM VIEW

Channel A-B A-B A-B A-B A-B A-B Position ofNo. 1 2 3 4 5 6 Pins in L-l0-19 3.0 2.0 2.0 2.0 1.5 3.0 8

20-29 5.0 2.8 4.0 2.5 2.0 3.8 6

30-39 5.5 5.0 4.5 4.5 4.5 5.0 440-54 6.0 5.8 5.5 5.2 5.2 5.8 3

55-74 6.9 6.8 6.5 6.0 6.2 6.5 275-80 7.4 7.8 7.2 7.0 7.8 7.2 1

(4) Set switches SW,0 and SWtl to OFF, and turn thepanel meter switch to CHECK.

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TM 11-^318

8 SIGNAL CORPS

(5) Plug in Handset TS-13-(*), or a headset andmicrophone.

(6) Put the set in operation by turning the VOLUMEcontrol full ON (to the right).

(7) Throw the adapter switch to ALIGN, and notethe panel meter reading. Turn the VOLUME control all theway back (to the left) from full ON, and note the change inthe meter reading. If the change is more than one division,replace Tube VT-185 that is in the adapter socket, Fig. 6,

with another one [Receiver-Transmitter BC-620-(*) has fourVT-185's] until one is found that is satisfactory. (This checksthe VT-185 for grid current, and it is essential for the alignment procedure that a tube with little or no grid current be

used in the adapter socket. Normal tubes will satisfy thiscondition, but one that produces a change of several divisionsin the meter reading has abnormal grid current, and must be

replaced.) The VT-185 that is selected should produce a meterreading between 1.5 and 2.5.

(8) Turn the VOLUME control full ON (to the right)again. Note the meter reading with the adapter metering

plug held away from the set. Then ground the metering plugto the chassis, and if the meter reading does not increase at

lease five division's, Tube VT-185 and/or Battery BA-40 may

be weak. Replace either or both as necessary.

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 8

FIG. 6—ADAPTERS M-394, M-399, Adapter Plug—METHOD OF

INSERTING IN RECEIVER POWER-AMPLIFIER-TUBE SOCKET

652727 O - 45 - 315

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TM 11—318

8 SIGNAL CORPS

b. Alignment Check of the Discriminator Circuit of RadioSets SCR-509-(*) and SCR-510-(*).—

(1) Turn the CHANNEL switch to either A or B.(2) Remove the corresponding (either A or B) crystal

from the crystal socket, and replace it with the 2.88 mc.crystal that is part of Alignment Equipment ME-73.

(3) Note the meter reading with the metering pluggrounded to the chassis (be certain that the VOLUME control is full ON). Then insert the metering plug in Pin No. 7

of the metering socket, and note the meter reading. The tworeadings should be within 1/2 division of each other. // theyare not, then carefully use Alignment Tool TL-207 that ispart of Alignment Equipment ME-73, to adjust the secondarytrimmer of the discriminator transformer T6 until the readings are the same. Note that the correct reading is obtainedafter the alignment tool is removed.

(4) Remove the 2.88 mc. crystal from the crystalsocket, and replace the channel crystal.

c. Alignment of Radio Sets SCR-509-(*) and SCR-510-(*)on Assigned Channels.—

(1) Be certain that the VOLUME control is full ON.Then insert the metering plug in Pin No. 1 of the meteringsocket, and turn the CHANNEL switch first to A and then toB. The meter reading should be approximately zero on bothchannels for good crystals. If the meter reads more than fivedivisions on either channel, then a defective crystal, a weakoscillator tube, or a weak Battery BA-40, is indicated.

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 8

(2) Insert the metering plug in Pin No. 2 of the me

tering socket. With the CHANNEL switch at A, adjust trimmer A! for a minimum reading on the meter. Then turn theCHANNEL switch to B and similarly adjust trimmer BI.

(3) Insert the metering plug in Pin No. 7 of themetering socket. Remove Tube VT-177 (1LH4) from thereceiver. If the panel meter reads off scale, reduce theVOLUME control retting. With the CHANNEL switch at A,adjust trimmer A3 for a maximum reading on the panel meter

(this also is the point of maximum noise in the phones).Turn the CHANNEL switch to B and similarly adjust trimmer B3.

(4) Leave the metering plug in Pin No. 7. With theCHANNEL switch at A, adjust trimmer A6 for a maximumreading on the panel meter (this also is the point of maximumnoise in the phones). This adjustment is quite sharp, so carefully watch for it. Turn the CHANNEL switch to B andsimilarly adjust trimmer B6.

(5) Repeat operations (3) and (4). Then replaceTube VT-177 (1LH4) in its socket.

(6) The preceding operations completely align channels A and B of the receiver, and must be completed beforeproceeding further. Also, before undertaking further operations, it is necessary to calibrate the meter as follows :

(a) Note the meter reading with the metering plugheld away from the set.

(b) Ground the metering plug to the chassis, and notethe meter reading. Reduce the VOLUME control setting until the difference between the two readings is 4*4 divisions.

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TM 11—318

8 SIGNAL CORPS

Then do not disturb this setting of the VOLUME control during the following operations.

(7) Insert the metering plug in Pin No. 3 of the metering socket. With the CHANNEL switch at A, press the"push-to-talk" switch and carefully adjust trimmer A2 for a

minimum reading on the panel meter. There may be severaldifferent settings of A that give a minimum reading. Thecorrect adjustment is the one that gives the lowest readingand still is close to the reference setting given in the table inPar. 8a (3). Then turn the CHANNEL switch to B andsimilarly adjust trimmer B2.

(8) Note the meter reading with the metering plugheld away from the set. Then insert the metering plug inPin No. 4 of the metering socket. With the CHANNELswitch at A, press the "push-to-talk" switch and carefullyand slowly adjust trimmer A2 so that the meter reading is one

division less than what it was with the metering plug heldaway from the set. Then turn the CHANNEL switch to Band similarly adjust trimmer B2. (After completing thisoperation it should be possible on both channels for you tohear in the phones what is said into the microphone.)

(9) Insert the metering plug in Pin No. 5 of the me

tering socket. With the CHANNEL switch at A, press the"push-to-talk" switch and adjust A4 for a minimum reading on

the panel meter. Place the CHANNEL switch at B and adjust B4 as above.

(10) Insert the metering plug in Pin No. 4 of the me

tering socket. With the CHANNEL switch at A, press the"push-to-talk" switch, and note the meter reading. It should

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 8

be the same as in operation (8). If it is not, then repeatoperation (8).

(11) Insert the metering plug in the center hole of themetering socket, and throw the Adapter M-394 switch to OFF.

(12) Set switch to SW10 to ON. With the CHANNELswitch at A, press the "push-to-talk" switch and adjust trimmer A5 for a maximum reading on the meter. This readingshould be at least 1.5. Then turn the CHANNEL switch toB and similarly adjust trimmer B5.

(13) Turn the panel meter switch to OPERATE. Setswitch SWU to ON. With the CHANNEL switch at A, pressthe "push-to-talk" switch and note the meter reading. Thisreading will be 1.5 or less if the correct setting was giventrimmer A2 in operation (7). If the reading is over 1.5, repeat the channel A portions of operations (7), (8), (9), (10),

(11) and (12). When the reading is 1.5 or less, adjust trimmer A6 for a minimum reading on the meter. Then turn theCHANNEL switch to B and similarly check the setting oftrimmer B2 and adjust trimmer B6.

(14) Disconnect the power cable, and replace Receiver-Transmitter BC-620-(*) in its case, taking care to see thatthe gasket is properly seated and that the panel screws aretightened to effectively seal the unit. If case CS-79-(*) wasused, remove Adapter RS-259 from Battery BA-39.

(15) With the set in its case, connect the power cable,and turn the panel meter switch to OPERATE, and theCHANNEL switch to A. Then press the "push-to-talk"switch, and note the meter reading. Turn the CHANNEL switch to B, press the "push-to-talk" switch, and again

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TM 11—318

8 SIGNAL CORPS

note the meter reading. The correct reading is 1.0 or less oneach channel. If the readings are more than 1.0, open theadjustment cover on top of the case and readjust trimmersA6 and B6 separately for minimum readings on the meter.

(16) Extend Antenna AN-45- (*) , and mount it on theantenna post at the rear of the case. Be certain the panelmeter switch is at OPERATE. Throw the CHANNEL switchto A, press the "push-to-talk" switch and note the meterreading. Turn the CHANNEL switch to B, press the "push-to-talk" switch, and again note the meter reading. The newreading should be between 1.8 and 2.5 on each channel. Ifthe readings are less than 1.8, check the antenna spring con

tact. If the readings are more than 2.5, recheck the adjustment of trimmers A6 and B0.

(17) In some vehicular installations, the meter reading with the panel meter switch at OPERATE may be greaterthan full scale. Whenever this is the case, again adjust trimmers A6 and B6 for minimum readings on the meter, withthe set in position in the vehicle and the antenna connected.Usually it is not necessary to readjust trimmer A6 and B6after they have been adjusted with the set in the case andno antenna connected.

d. Complete Alignment of Radio Sets SCR-509-(*) andSCR-510-(*).—

(1) For complete alignment it is necessary to adjustthe trimmers on transformers T3, T4, T5 and T6. To do this,remove the set from its case, connect it to its power supply,and proceed as follows:

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 8-9

(1) Turn the CHANNEL switch to either A or B.(2) Remove the corresponding crystal (either A or

B) from the crystal socket and replace it with the 2.88 mc.

crystal that is part of Alignment Equipment ME-73.

(3) Set up the alignment unit as instructed in Par. 8a(6), (7) and (8).

(4) Insert the metering plug in Pin No. 3 of the me

tering socket. With the VOLUME control full ON, adjustthe adjustment screws (on top of the cans and under the

chassis) of transformers T3, T4, and T5 until you get minimum readings on the panel meter.

(5) Insert the metering plug in Pin No. 7 of the metering socket. Use a jumper to short out terminals 3 and 4

of transformer T6, and adjust the primary trimmer for a

minimum reading on the panel meter. Then be sure to removethe jumper from the terminals.

(6) Leave the metering plug in Pin No. 7, and adjustthe secondary trimmer of transformer Te as described inPar. 8& (3).

9. Aligning Radio Sets SCR-609-(*) and SCR-610-(*), withAdapter M-399 Installed.—

a. Preliminary Procedure. —

(1) Remove the chassis of Receiver-Transmitter BC-659- (*) from its case. Connect the chassis to Plate SupplyUnit PE-117-(*) or to Case CS-79-(*) with Batteries BA-39and BA-40 installed. If Case CS-79-(*) is used, insertAdapter RS-259 that is part of Alignment Equipment ME-73,

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TM 11—318

9 SIGNAL CORPS

into Battery BA-39 to protect the transmitter final amplifiertube against possible damage by high plate current.

(2) Insert the proper crystals in the crystal socket.

(3) Preset the tuning capacitors (A1 through ,A7, and

B! through B7) for the channels selected, using the approximate trimmer settings given in the following table :

A7-B,P.A.Plate

1.0

1.8

2.4

2.8

3.1

3.8

3.9

4.0

4.1

4.2

4.7

4.85.0

(4) Set switches SW1 and SW2 to OFF, and turn thepanel meter switch to CHECK.

(5) Plug in Handset TS-13-(*), or a headset andmicrophone. Do not use the internal speaker during the alignment procedure.

(6) Put the set in operation by turning the VOLUMEcontrol full ON (to the right).

(7) Throw the adapter switch to ALIGN, and note

the panel meter reading. Turn the VOLUME control all the

Chan A2-B2 A.-B. A4-B4 Aa-B(nel A.-B Rec. R.F. Trans. A -B P.A.

Nos. Osc. Mixer Grid Osc. Buffer Grid270 0.0 1.0 0.8 0.2 0.4 0.0

280 0.6 1.9 1.4 1.1 1.2 0.7290 1.4 2.4 2.0 1.7 1.7 1.3

300 2.2 8.0 2.4 2.3 2.2 1.8

310 2.9 3.6 8.1 2.8 2.7 2.3

320 8.6 4.1 4.1 8.5 3.8 3.0

330 4.0 4.2 4.2 3.9 8.7 3.4

340 4.1 4.6 4.5 4.2 3.9 3.7

350 4.6 5.0 4.7 4.5 4.0 3.9

360 4.9 5.2 4.8 4.8 4.5 4.2370 5.4 5.5 5.2 5.2 4.9 4.6

380 5.6 5.6 5.3 5.5 5.0 4.8

389 5.8 5.8 5.4 5.9 5.1 5.0

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 9

way back (to the left) from full ON, and note the change inthe meter reading. If the change is more than one division,replace Tube VT-185 that is in the adapter socket, Fig. 6,

with another one [Receiver-Transformer BC-659-(*) hasfour VT-185's], until one is found that is satisfactory. (Thischecks the VT-185 for grid current, and it is essential for thealignment procedure that a tube with little or no grid currentbe used in the adapter socket. Normal tubes will satisfy thiscondition, but one that produces a change of several divisionsin the meter reading has abnormal grid current, and mustbe replaced.) The VT-185 that is selected should produce a

meter reading between 1.5 and 2.5.

(8) Turn the VOLUME control full on (to the right)again. Note the meter reading with the adapter meteringplug held away from the set. Then ground the metering plugto the chassis, and if the meter reading does not increase atleast five divisions, Tube VT-185 and/or Battery BA-40 maybe weak. Replace either or both as necessary.

b. Alignment Check of the Discriminator Circuit ofRadio Sets SCR-609-C*) and SCR-610-(*).—

(1) Turn the CHANNEL switch to either A or B.(2) Remove the corresponding crystal (either A or

B) from the crystal socket and replace it with the 4.3 mc.crystal that is part of Alignment Equipment ME-73.

(3) Note the meter reading with metering pluggrounded to the chassis (be certain that the volume control isfull ON). Then insert the metering plug in Pin No. 7 of themetering socket and note the meter reading. The two readings

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TM 11—318

9 SIGNAL CORPS

should be within 1/2 division of each other. // they are not,

then carefully use Alignment Tool TL-207 that is part ofAlignment Equipment ME-73, to adjust the secondary trimmer of the discriminator transformer T5 until the readingsare the same. Note that the correct reading is obtained afterthe alignment tool is removed.

(4) Remove the 4.3 mc. crystal from the crystalsocket, and replace the channel crystal.

c. Alignment of Radio Sets SCR-609-(*) and SCR-610-(*)on Assigned Channels.—

(1) Be certain that the VOLUME control is full ON.Then insert the metering plug in Pin No. 1 of the meteringsocket, and turn the CHANNEL switch first to A and thento B. The meter reading should be approximately zero onboth channels for good crystals. If the meter reads more thanfive divisions on either channel, then a defective crystal, a

weak oscillator tube, or a weak Battery BA-40, is indicated.

(2) Insert the metering plug in Pin No. 2 of themetering socket. With the CHANNEL switch at A, adjusttrimmer Ax for a minimum reading on the meter. Thenturn the CHANNEL switch to B and similarly adjust trimmer Bj.

(3) Insert the metering plug in Pin No. 8 of the metering socket. With the CHANNEL switch at A, adjust trimmer A2 for maximum noise in the phones. (The meter reading should decrease slightly at the point of maximum noise.)Then turn the CHANNEL switch to B and similarly adjusttrimmer B2.

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 9

(4) Leave the metering plug in Pin No. 8. With theCHANNEL switch at A, adjust trimmer A3 for maximumnoise in the phones. Watch for the dip in the meter readingat the point of maximum noise. Then turn the CHANNELswitch to B and similarly adjust trimmer B3.

(5) Leave the metering plug in Pin No. 8. With theCHANNEL switch at A, adjust trimmer A7 for maximumnoise in the phones. Watch for the dip in the meter reading,as it is the correct adjustment of the capacitor. Then turnthe CHANNEL switch to B.and similarly adjust trimmer B7.

(6) Repeat operations (3), (4), and (5).(7) The preceding operations completely align chan

nels A and B of the receiver, and must be completed beforeproceeding further. Also, before undertaking further operations, it is necessary to calibrate the meter, as follows:

(a) Note the meter reading with the metering plugheld away from the set.

(b) Ground the metering plug to the chassis, and notethe meter reading. Reduce the VOLUME control setting until the difference between the two readings is 41/-; divisions.Then do not disturb this setting of the VOLUME control during the following operations.

(8) Insert the metering plug in Pin No. 3 of the metering socket. Remove Tube VT-179 (the first radio frequency amplifier tube) from the set. With the CHANNELswitch at A, press the "push-to-talk" switch and carefullyadjust trimmer A4 for a minimum reading on the meter.There may be several different settings of A4 that give a

minimum reading. The correct adjustment is the one that

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TM 11—318

9 SIGNAL CORPS

gives the lowest reading and still is close to the referencesetting given in the table in Par. 9a (3). Then turn theCHANNEL switch to B and similarly adjust trimmer B4.

(9) Note the meter reading with the metering plugheld away from the set. Then insert the metering plug inPin No. 4 of the metering socket. With the CHANNELswitch ,at A, press the "push-to-talk" switch and carefullyand sloivly adjust trimmer A4 so that the meter reading isone division less than what it was with the metering plugheld away from the set. Then turn the CHANNEL switchto B and similarly adjust trimmer B4. (After completing thisoperation it should be possible on both channels for you tohear in the phones what is said into the microphone.)

(10) Insert the metering plug in Pin No. 5 of the metering socket. With the CHANNEL switch at A, press the"push-to-talk" switch and adjust trimmer A- for a minimumreading on the meter. Then turn the CHANNEL switch to Band similarly adjust trimmer B-.

(11) Insert the metering plug in Pin No. 4 of the metering socket, press the "push-to-talk" switch, and note themeter reading. It should be the same as in operation (9).If it is not, repeat operation (9).

(12) Replace the first radio-frequency amplifier TubeVT-179 in its socket in the set.

(13) Insert the metering plug in the center hole ofthe metering socket, and throw the adapter switch to OFF.

(14) Set switch SWt to ON. With the CHANNELswitch at A, press the "push-to-talk" switch and adjust trimmer A8 for a maximum reading on the meter. This reading

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TM 11—318

ALIGNMENT EQUIPMENT ME-73 9

should be at least 1.5. Then turn the CHANNEL switch toB and similarly adjust trimmer B6.

(15) Turn the panel meter switch to OPERATE. Setswitch SW2 to ON. With the CHANNEL switch at A, pressthe "push-to-talk" switch and adjust trimmer A7 for a minimum reading on the meter. This reading should be less than1.0. Then turn the CHANNEL switch to B and similarlyadjust B7. These adjustments of trimmers A7 and B7 shouldapproximate the settings obtained in operation (5). If theydo not, repeat operations (8), (9), (10), and (11).

(16) Disconnect the power cable, and replace Receiver-Transmitter BC-659-(*) in its case, taking care to see thatthe gasket is seated properly and that the panel screws aretightened to effectively seal the unit. If Case CS-79-(*) wasused, remove Adapter RS-259 from Battery BA-39.

(17) With the set in its case, connect the power cable,

and turn the panel meter switch to OPERATE. With theCHANNEL switch at A, press the "push-to-talk" switch, andnote the meter reading. Turn the CHANNEL switch to B,press the "push-to-talk" switch, and again note the meterreading. The correct reading is 1.0 or less on each channel.If the readings are more than 1.0, open the adjustment coveron top of the case and readjust trimmers A7 and B7 separatelyfor minimum readings on the meter.

(18) Extend Antenna AN-29-(*), and mount it on theantenna post at the rear of the case. Be certain the panelmeter switch is at OPERATE. With the CHANNEL switchat A, press the "push-to-talk" switch and note the meterreading. Turn the CHANNEL switch to B, press the "push

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TM 11—318

9 SIGNAL CORPS

to-talk" switch, and note the meter reading. The readingshould be between 1.8 and 2.5 on each channel. If the readings are less than 1.8, check the antenna spring contact. Ifthe readings are more than 2.5, recheck the adjustment oftrimmers A7 and B7.

(19) In some vehicular installations, the meter reading with the panel meter switch at OPERATE may be greaterthan full scale. Whenever this is the case, again adjust trimmers A7 and B7 for minimum readings on the meter, withthe set in position in the vehicle and the antenna connected.Usually it is not necessary to readjust trimmers A7 and B7after they have been adjusted with the set. in the case andno antenna connected.

d. Complete Alignment of Radio Sets SCR-609-(*) and

SCR-610-(*)<—

For complete alignment it is necessary to adjust thetrimmers on transformers T2, T3, T4, and T5. To do this,remove the set from the case, connect it to its power supply,and proceed as follows:

(1) Turn the CHANNEL switch to either A or B.(2) Remove the corresponding crystal (either A or

B) from the crystal socket and replace it with the 4.3 mc.

crystal that is part of Alignment Equipment ME-73.

(3) Set up the alignment unit as instructed in Par.9a (6), (7), and (8).

(4) Insert the metering plug in Pin No. 3 of the metering socket. With the VOLUME CONTROL full ON, adjust the adjustment screws (on top of the cans and under the

chassis) of transformers T2, T3, and T4 until you get a minimum reading on the meter.

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ALIGNMENT EQUIPMENT ME-73

TM 11—318

9

(5) Insert the metering plug in Pin No. 8 of the metering socket, and adjust the primary trimmer of transformerT5 for a minimum reading on the meter.

(6) Insert the metering plug in Pin No. 7 of the metering socket, and adjust the secondary trimmer of transformer T5 as described in Par. 96 (3).

WIRING DIAGRAM

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TM 11—318SIGNAL CORPS

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