president jfk

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Size Document Number Rev

Date: Sheet of

1.0

Draw By: Rick Jackson (Euro Radio Co).

D

1 2Thursday, March 22, 2007

President JFK.SCHSize Document Number Rev

Date: Sheet of

1.0


D


President JFK.SCHSize Document Number Rev

Date: Sheet of

1.0


D


President JFK.SCH

CHANNEL SWITCH

R301 TO R312ARE ALL 1K8R313 IS 1K

1/2 WATT

PC - 714

LOWMID

HI

LOWMID

HI

LOW HI

PC - 715

LOCK DECTOR

1/2 WATT1/2 WATT

1/2 WATT

1/2 WATT

L8 LD113

RF GAIN

1st MIXERRF AMP

VOLUME

SQUELCH

TONE

SQUELCHPRE-SET

NB/ANL ANL

OFF

NB/ANLANL

OFF

AM

FMTo PIN (10)ON FM PCB

To PIN (13)ON FM PCB

S/RF

S/RF

SWR

SWR

CAL

CAL

SWR/CAL

SIGNAL METERPER-SET

RF POWER METER PER-SET

To PIN (9)ON FM PCB

FM TX AUDIO

10.240 MHz

15.820 TO 16.260 MHz = LOW16.270 TO 16.710 MHz = MID16.720 TO 17.160 MHz = HI

16.275 TO 16.715 MHz = LOW16.725 TO 17.165 MHz = MID17.175 TO 17.615 MHz = HI

RX TX

To PIN (4)ON FM PCB

MIC GAIN

To PIN (6)ON FM PCB

To PIN (5)ON FM PCB

TX

2 WATT

2 WATT 2 WATT

TX

RX

RX

RX

TX

AM To PIN (15)ON FM PCB

FM

1 WATT

13.8 VDC

To PIN (3)ON FM PCB

PTT

NOTE: C108 FROM 2p TO 8p

+

-

To PIN (2, 7 and 12) ON FM PCB

FM TX AUDIO

To PIN (11)ON FM PCB

TX (8 TO 8.5) VOLTS

RX (8 TO 8.5) VOLTS

RX (8 TO 8.5) VOLTS

RX (8 TO 8.5) VOLTS

To PIN (1)ON FM PCB

To PIN (8)ON FM PCB

RF POWER

PC - 714 BEEP

+

-

TX MIXER OUTPUT26.515 TO 26.955 MHz = LOW26.965 TO 27.405 MHz = MID27.415 TO 27.855 MHz = HI

NOTE: C85 FROM 2p TO 5p

RXTX

PART OF PC - 715

1/2 WATT

13.8 VDC

X110.240 MHz

X110.240 MHz

C8610nC8610n

SP201SPEAKER

SP201SPEAKER

C1562u2

C1562u2

C9410uC9410u

R13110KR13110K

R261MR261M

L17LA311

L17LA311

C35120pC35120p

C56220nC56220n

C5010nC5010n

C42220pC42220p

C10047n

C10047n

C852p **

C852p **

TR252SC945TR25

2SC945

VR202100K

VR202100K

C129150pC129150p

R5047RR5047R

RY1RX/TX RELAY

RY1RX/TX RELAY

L5LA181

L5LA181

R65100KR65

100K

R120470RR120470R

R1045K6R1045K6

R12710KR12710K

D181N4003

D181N4003

C5810nC5810n

1

23

4

56

78

IC2MB3712

1

23

4

56

78

IC2MB3712

L10LE092L10

LE092

1

23

4

56

78

IC1MB3712

1

23

4

56

78

IC1MB3712

D81N60

D81N60

D191N60D19

1N60

R8510KR8510K

C155100nC155100n

C531u

C531u

C1010nC1010n

C7110nC7110n

R314330KR314330K

C221n

C221n

C128150pC128150p

C45220pC45220p

S206A

SWR/CAL SWITCH

S206A

SWR/CAL SWITCH

R7815KR7815K

C3110uC3110u

VR2100KVR2100K

C1261n

C1261n

R1262M2R1262M2

C3053n3

C3053n3

C2310uC2310u

R30100KR30

100K

R1326K8

R1326K8

R553K3R553K3

TR132SC1975

TR132SC1975

D402TLRG101

D402TLRG101

J203EXT SP JACK

J203EXT SP JACK

R1091K

R1091K

D201N60D20

1N60

R871K

R871K

R6315RR6315R

TR3012SC945TR3012SC945

R510KR510K

R361KR361K

C11122n

C11122n

S203ON/OFF SWITCH

S203ON/OFF SWITCH

R972K7R972K7

D401 UR202D401 UR202

R32210K

R32210K

R7522RR7522R

R14220RR14220R

TR262SA733

TR262SA733

R122220KR122220K C125

100pC125100p

CF2455 KHz

CF2455 KHz

C3447nC3447n

R32010KR32010K

C11610n

C11610n

R1??.5R

R1??.5R

R43470RR43

470R

D6IS2075

D6IS2075

R881KR881K

R351KR351K

C7368pC7368p

PART OF RY1PART OF RY1

R96

10K

R96

10K

C153330pC153330p

TP2TP2

R333KR333K

R411K2R411K2

C6033uC6033u

C984u7C984u7

R11915RR11915R

R93

6K8

R93

6K8

D13IS2688

D13IS2688

R8468RR8468R

R1125K6

R1125K6

L2LA080

L2LA080

2SC1675TR18

2SC1675TR18

C592u2C592u2

C9947uC9947u

R13310KR13310K

R100150RR100150R

R1747KR1747K

C12210nC12210n

C3347nC3347n

R33

820K

R33

820K

C4410nC4410n

C7247pC7247p

TR22SC1674

TR22SC1674

R3847KR3847K

J205

DC 13.8 VOLTS

J205

DC 13.8 VOLTS

R402K2R402K2

R102100RR102100R

R22220RR22220R

R6939KR6939K

C38390pC38390p

C5110nC5110n

L18LA327L18

LA327

C107470pC107470p

R10122RR10122R

C41nC41n

TR62SC1675

TR62SC1675

R42220RR42220R

C102470uC102470u

C105150pC105150p

R161K

R161K

C15147n

C15147n

C9310nC9310n

C7768pC7768p

C11910u

C11910u

R1113K3R1113K3

R151K

R151K

C1533pC1533p

R2782KR2782K

TR272SC1675

TR272SC1675

C10110nC10110n

C11810n

C11810n

R208330RR208330R

D4IS2075

D4IS2075

R95

15K

R95

15K

C20147n

C20147n

C8910nC8910n

R67100RR67

100R

CF110.7 MHz

CF110.7 MHz

C1747nC1747n

TR122SC945

TR122SC945

L23CHOKE

L23CHOKE

R3163K3R3163K3

C4610nC4610n

C922pC922p

R3110KR3110K

C3021u

C3021u

R204K7R204K7

D71N60

D71N60

D14IS2075D14

IS2075

C30310u

C30310u

R8222KR8222K

C1241n

C1241n

R74100RR74

100R

C12110n

C12110n

VR20450K

VR20450K

C11447n

C11447n

R11447RR11447R

R18330RR18

330R

C74220pC74220p

VR2011K

VR2011K

C327pC327p

R731KR731K

C1083p **

C1083p **

R1175K6R1175K6

R98100RR98

100R

R76150RR76

150R

C14410n

C14410n

R11220RR11

220R

L13LC134

L13LC134

R10330RR10330R

R64

1K

R64

1K

S201A

NB/ANL SWITCH

S201A

NB/ANL SWITCH

1

2 3

4

J204MIC JACK

J204MIC JACK

C1147pC1147p

R51330RR51330R

R13330RR13

330R

R451RR451R

C7810nC7810n

R12810K

R12810K

C43220pC43220p

C15710uC15710u

R2833KR2833K

C2722nC2722n

TR152SC1675

TR152SC1675

METER LAMPMETER LAMP

D404LEDD404LED

S204DELTA TUNE

S204DELTA TUNE

R4822RR4822R

C1310nC1310n

C4810nC4810n

TR172SC1675

TR172SC1675

D301IS2075D301

IS2075

C1210nC1210n

L4LA180

L4LA180

R57150RR57

150R

C512u2C512u2

C210nC210n

TR142SC1675

TR142SC1675

R2956KR2956K

L3LA088

L3LA088

VR20350K

VR20350K

R1051K

R1051K

R31956K

R31956K

R93K3R93K3

C110uC110u

R8220RR8

220R

R1241K

R1241K

C8710nC8710n

S206BS206B

D403LEDD403LED

C5433uC5433u

C8410nC8410n

C2047nC2047n

C7668nC7668n

R4622RR4622R

TR92SC1944

TR92SC1944

C10422p

C10422p

C4910nC4910n

D11IS2075

D11IS2075

VR330KVR330K

TR72SC945

TR72SC945

D125V1D125V1

J201ANTJ201ANT

C710nC710n

R3151K

R3151K

VR2065K

VR2065K

S205BBANDS205BBAND

L1LA029

L1LA029

TR12SC945

TR12SC945

C6847pC6847p

R1232K7R1232K7

C96

2u2

C96

2u2

R2410KR2410K

C106390pC106390p

R22K2R22K2

R1081K

R1081K

R19100RR19

100R

C11310n

C11310n

D1IS2075

D1IS2075

C83150pC83150p

C2110nC2110n

R592K2R592K2


R77100RR77

100R

R7150R

R7150R

VR20520K

VR20520K

R439KR439K

1

4 5

9

763 8

2

AMP MIXVss

AMP

Vdd

IC3TA7310

AMP MIXVss

AMP

Vdd

IC3TA7310

R59

39K

R59

39K

R7947RR7947R

L20LA088L20

LA088

R4011K5R4011K5

R2533KR2533K

C51nC51n

C8210nC8210n

S202AMODE SWITCH

S202AMODE SWITCH

TR192SC1675

TR192SC1675

C97.47uC97.47u

R61

10K

R61

10K

R32110KR32110K

X214.910 MHzX214.910 MHz

TR82SC945

TR82SC945

C11510n

C11510n

L19LA327

L19LA327

TR42SC1675

TR42SC1675

D5IS2075

D5IS2075

R542K2R542K2

R582K2R582K2

S205ABANDS205ABAND

VR130KVR130K

D2IS2075

D2IS2075

C1822uC1822u

R12110KR12110K

R63K3R63K3

R911K2R911K2

R11322K

R11322K

R1033K3

R1033K3

L9LE093

L9LE093

D3IS2075

D3IS2075

L12LD033L12

LD033

TR222SD471TR22

2SD471

L11LC072

L11LC072

C120100uC120100u

L15LA088

L15LA088

R81100RR81

100R

C7527pC7527p

TR52SC1675

TR52SC1675

TR102SC1944

TR102SC1944

C154100nC154100n

TR162SC1675

TR162SC1675

R8310KR8310K

TR292SA733TR29

2SA733

C30110n

C30110n

R66120RR66

120R

R1072K2

R1072K2

TR32SC1675

TR32SC1675

L2133uL2133u

R317680RR317680R

C2024n7

C2024n7

R5633RR5633R

R5810KR5810K

C7956pC7956p

C8810nC8810n

X315.360 MHzX3

15.360 MHz

R7110KR7110K

M201SWR - S/RF METER

M201SWR - S/RF METER

R2322KR2322K

R11010RR11010R

C1647nC1647n

R681K

R681K

R125330RR125330R

L22LD087L22

LD087

R2147KR2147K

C62220nC62220n

C8010nC8010n

R624R7R624R7

C2910nC2910n

T1TF197

T1TF197

R8022KR8022K

L7LA276

L7LA276

C2510uC2510u

L16100uL16100u

C70180pC70180p

VC11 TO 20p

VC11 TO 20p

C611nC611n

C10310n

C10310n

C13010nC13010n

C3073n3

C3073n3

L6LA163

L6LA163

C1311n

C1311n

R32100KR32

100K

R7210KR7210K

C2410nC2410n

S201BS201B

TR232SC1675

TR232SC1675

C521uC521u

R891KR891K

VR2075K

VR2075K

C11247u

C11247u

C14310n

C14310n

C394n7C394n7

D179V4D179V4

C810nC810n

C10910n

C10910n


R3933KR3933K

D15IS2075

D15IS2075

R34330RR34

330R

TR242SC1675

TR242SC1675

R123K3R123K3

R12947K

R12947K

C551n

C551n

C154330pC154330p

R944K7R944K7

C11047u

C11047u

C9010nC9010n

C4010nC4010n

X415.810 MHzX4

15.810 MHzC92120pC92120p

C12710n

C12710n

R11K5R1

1K5

C66200pC66200p

S202BMODE SWITCH

S202BMODE SWITCH

TR202SC945

TR202SC945

R9982KR9982K

C3063n3

C3063n3

C36180pC36180p

C1410nC1410n

C304220pC304220p

R1061K

R1061K

C6710nC6710n

R471R

R471R

R7010KR7010K

T/R9

1/2R10

VCC11 R0 12

RI 13

RB 14

LD 15

TC 16

PD 17

AI 18

AO 19

FS 20

GND 21

FIN 22P11

P22

P33

P44

P55

P66

T7

Q8

IC4UPD2816

IC4UPD2816

R60

10K

R60

10K

C2815nC2815n

R90

220R

R90

220R

R491RR491R

L14LC072

L14LC072

D9IS2688

D9IS2688

C12310n

C12310n

R922K7R922K7

R444K7R444K7

R130100KR130100K

C262u2C262u2

C4710nC4710n

TP1VCOTP1VCO

C91270pC91270p

C8147pC8147p

C631000u

C631000u

R1513K3R1513K3

C610nC610n

C1474u7

C1474u7

TR112SC2029

TR112SC2029

C95

2u2

C95

2u2

S207BEEPS207BEEP

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Size Document Number Rev

Date: Sheet of

1.0



JFK FM MODULA.SCHSize Document Number Rev

Date: Sheet of

1.0



JFK FM MODULA.SCHSize Document Number Rev

Date: Sheet of

1.0



JFK FM MODULA.SCH

PIN 13

PIN 12

PIN 10

PIN 11

PIN 15

PIN 9

DEVIATION

PIN 1

PIN 8

PIN 2

LOW POWER

PIN 7

PIN 3

PIN 4

PIN 6

PIN 5

PC - 904FM MODULA

C5034u7

C5034u7

C81410n

C81410n

TR8022SC945TR8022SC945

R807150KR807150K

C81039n

C81039n

TR8012SC945TR8012SC945

C8052n2C8052n2

R5032K2

R5032K2

C8154n7

C8154n7

C81247n

C81247n

C50910n

C50910n

L801LA204L801

LA204

R5045K6

R5045K6

C80747p

C80747p

C81310n

C81310n

C80622n

C80622n

C50710n

C50710n

1

2

5

6

7

4

3

L.P.F.PEAK

DETR

BIAS CCT

VCC

GNDIC801

UPC1028H

L.P.F.PEAK

DETR

BIAS CCT

VCC

GNDIC801

UPC1028H

C8031u

C8031u

TR5012SA733TR5012SA733

C802100uC802100u

R80612K

R80612K

D501IS2075D501

IS2075

R5021K

R5021K

R812220KR812220K

C5061u

C5061u

R802150KR802150K

R804150KR804150K

R5065K6

R5065K6

VR8013K

VR8013KC804

10nC80410n

C50510uC50510u

C5011n

C5011n

C5041n

C5041n

C80939n

C80939n

R80133KR80133K

C5024n7

C5024n7

R5011K

R5011K

R803820RR803820R

R507470RR507470R

R809330KR809330K

R811100RR811100R

R8088K2

R8088K2

R8103K3

R8103K3

C81110u

C81110u

C80139n

C80139n

C5084n7

C5084n7

VR50110K

VR50110KR805

12KR80512K

R5054K7

R5054K7

uPD2814, uPD2816, HD42853, KM5624 PLL Integrated Circuits

Overview

This 27 MHz band, PLL frequency synthesizer LSI chip is designed specifically for CB transceivers. The integrated circuit`s incorporates PLL circuitry and a controller for CB applications on a single CMOS chip. This PLL-circuit use a 6 bit ROM programmable divide-by-N counter. The ROM-table is programmed from factory to 40 channels CEPT.

Down-converting of the frequency to the divider

This PLL Circuit use a Mixer and a X-Tal Oscillator to convert the output frequency f OUT to the f IN to the PLL Circuit. The X-Tal frequency is f XTAL = f OUT - f IN

The output frequency can be changed by changing the mixing-xtal or add a new mixing-xtal to the oscillator.

Pin Name Decription 1 P1 Binary programable input 1 2 P2 Binary programable input 2 3 P3 Binary programable input 3 4 P4 Binary programable input 4 5 P5 Binary programable input 5

6 P6 Binary programable input 6 7 T Divided by 2 input 8 Q Divided by 2 output 9 T/R Transmit=LOW Receive=HIGH 10 1/2R Referency frequency divided by 2 11 VDD Positive Power Supply (+5Volt) 12 RO Referency oscillator Output (X-tal) 13 RI Referency oscillator Input (X-tal) 14 RB Reference Oscillator Output (Buffered) 15 LD Loop Detector output 16 VDD Positive Power Supply (+5Volt) 17 PD Phase Detector output 18 AI Loop filter Amplifier Input 19 AO Loop filter Amplifier Output 20 FS Function Select - HIGH=10kHz step LOW=5kHz step 21 GND Ground 22 FIN VCO Oscillator Input

ROM Code Table

Channel P6 P5 P4 P3 P2 P101 0 0 0 0 0 1

02 0 0 0 0 1 0

03 0 0 0 0 1 1

04 0 0 0 1 0 0

05 0 0 0 1 0 1

06 0 0 0 1 1 0

07 0 0 0 1 1 1

08 0 0 1 0 0 0

09 0 0 1 0 0 1

10 0 1 0 0 0 0

11 0 1 0 0 0 1

12 0 1 0 0 1 0

13 0 1 0 0 1 1

14 0 1 0 1 0 0

15 0 1 0 1 0 1

16 0 1 0 1 1 0

17 0 1 0 1 1 1

18 0 1 1 0 0 0

19 0 1 1 0 0 1

20 1 0 0 0 0 0

21 1 0 0 0 0 1

22 1 0 0 0 1 0

23 1 0 0 0 1 1

24 1 0 0 1 0 0

25 1 0 0 1 0 1

26 1 0 0 1 1 0

27 1 0 0 1 1 1

28 1 0 1 0 0 0

29 1 0 1 0 0 1

30 1 1 0 0 0 0

31 1 1 0 0 0 1

32 1 1 0 0 1 0

33 1 1 0 0 1 1

34 1 1 0 1 0 0

35 1 1 0 1 0 1

36 1 1 0 1 1 0

37 1 1 0 1 1 1

38 1 1 1 0 0 0

39 1 1 1 0 0 1

40 0 0 0 0 0 0

Explanation of pin function terms VCC or VDD This is the +DC supply voltage which actually provides the operating power to the chip, and is generally in the range of 4-8 volts. GND or VSS This is the DC power ground connection for the above. NOTE: A chip may be found to have one or more of its functional pins tied to either of the above sources. This may be done to enable a specific function by connecting that function to a ''1'' or ''0'' , or to prevent an unused function pin from ''floating'' unconnected to prevent a possible change in its logic state. RI Reference Oscillator input. This is where the (usually) 10.240 MHz crystal is connected. Crystal pins sometimes called ''X'' by the manufacturer. RO Reference Oscillator output. In most chips the crystal is simply connected across RI and RO because the chip has a built-in oscillator circuit which only requires some external capacitors. However some chips such as the PLL02A don't have the built-in oscillator; thus there is no RO pin and an active transistor oscillator is required externally which connects to RI. 1/2R A built-in divided by 2 circuit which provides an output of half the 10.240 MHz Reference Oscillator frequency, or 5.12 MHz. If used, it normally connects to a tripler circuit to provide a 15.360 MHz signal(5.12 MHz x 3) which can be used for loop mixing with the 16 MHz VCO. This mixing provides a low-frequency signal input or downmix to the Programmable Divider. RB Buffered output of the 10.240 MHz Reference Oscillator. Thig signal if present can be used for mixing with the 10.695 MHz receiver first IF or mixing with the 16 MHz VCO during TX mode to provide the 455 kHz second IF (RX) or the direct on-channel TX frequency. FIN Input to the Programmable Divider which is coming from the output of the VCO. Sometimes called ''PI'' (Programmable Input) or ''DI'' (Divider Input) by some manufacturers. This is the actual downmix signal or direct VCO signal in the faster chips which will be compared to the Reference Divider's output in the Phase Detector. It is the change in this signal's frequency which forces the Phase Detector and VCO to correct until the loop locks. DO Phase Detector output. Sometimes called "PO'' or ''PDOUT" (Phase Output) or "EO" (Error Output) by some manufacturers. This is the output which results from comparing RI and FIN. If the two inputs don't match exactly, this circuit sends a DC correction output to the Loop Filter/VCO until the loop corrects itself and locks up. LD Lock Detector. Sometimes called "LM" (Lock Monitor) by some manufacturers.This is a second output of the Phase Detector which is used to kill the transmitter (and sometimes the receiver) if the loop is not locked and operating correctly. Some chips have more than one Lock Detector pin and thus you'll sometimes see''LD1'' and "LD2" on the specs. When two Lock Detectorg are used, their normal outputs are usually opposite logicstates; i.e., one LD ig normally ''1'' and the other is normally ''0''.This is a convenient design feature which allows the manufacturer some flexibility because he can have a choice ofinhibiting circuits; some work with LOW outputs,some work with HIGH outputs. Some rigg use both LD pins in their circuits.

MC Misprogram Code Detector. The same idea as the Lock Detector, this is found in the newer ROM chips. If you try to force an illegal program code on the chip, this pin is activated and will kill the transmitter, receiver, or in some cases, call up Ch.9 or Ch.19 instead. T/R Transmit/Receive switch. This is used to provide the 455 kHz offset for the receiver's second IF stage in dual-conversion AM or FM rigs. Pressing the mike button changes this pin's logic state to its opposite state from the RX Mode.This shifts the ROM controlling the Programmable Divider, and in some chips also shifts the output of the Reference Divider from standard 5 kHz steps to 2.5 kHz steps. The T/R shift is the reason you`ll see two different sets of N-Codes and VCO frequencies in a rig' s service manual. NOTE: Some manufacturers' chip spec sheets show a bar (-) above some pin functions, such as LM, T/R, etc. This bar is a digital logic symbol which indicates what state (''1'' or ''0'') th'at pin is in when activated. For example, theT/R with the bar notation means that the pin is normally HIGH ("1") in the Receive Mode and normally LOW ("0") in the Transmit Mode. /LM means the Lock Monitor is "active LOW". , i.e., it is normally HIGH but goes LOW if the loop is unlocked. FS Frequency Select. This is a feature of some chips which allows them to synthesize frequencies in either 10 kHz CB steps, or 5 kHz steps. Remember, some older chips such as the PLLO2A were intended for other uses besides CB, such as VHF marine radios, aircraft radios, etc., where 5 kHz channel spacing is common. In addition, this feature often makes it easier to synthesize SSB frequencies as well as AM/FM although the feature hasn't been used much for this. Depending upon whether the chip has an internal pull-up or pull-down resistor here, it is generally connected to produce 10 kHz CB spacings in the older chips. The newer chips having a T/R shift must use the 5 kHz spacing when the T/R pin is also used. IMPORTANT: You can't use this function to get 5 kHz channel spacings, because the Programmable divider must also change to match the spacing. AI and AO Active Loop Filter Amplifier input and output. This circuit if present is used to smooth out the digital waveform coming from the Phase Detector, before it's applied to the VCO (See text.) This filter is found in the newer CB-only chips. The older chips (Eg, PLL02A) require external passive filters using capacitors and resistors. In many rigs you'll find that these pins are connected either directly or through a resistor so that they are placed in series betw een the Phase Detector output pin and the VCO input. FIL Active filter. W e're using this designation in certain very old chips when the exact spec sheets are not available but it's known from studying the chip's wiring in the rig that the pins are in fact part of a loop filter. T and Q This is a wave-shaping circuit found in a few NEC chips (uPD2810, uPD2814, uPD2816, and uPD2824). It adds design flexibility but is often not even connected. This circuit consistsofan input amplifier and a ''flip-flop'', and its purposeis to change asine-wave input (T) to a square-wave output (Q) which is more compatible with digital electronic circuits. P0 ..... P10 Program Select pins from Channel Selector switch. (Sometimes called "D" for ''Data'' rather than "P" for ''Program''.) These pins control the actual channel selection. They may control selection through straight binary coding, BCD, or ROM. The sub-numbers indicate the weight or significance of each pin. For example if there were 8 programming pins, P1 to P8, P1 would be in the "least significant bit" and P8 would bethe "most significant bit".The higher the sub-number, the greater the weight of that pin. NC No Connection. An unused pin May actually be disconnected inside the chip, or simply not used for that particular rig' s PLL circuit.

uPC1028H FM IF Amplifier and Discriminator

Similar to AN5212 AN5730 AN5732 TA7130P LA1150 KA2245 KIA7130 BA403

&127; 3 stage differential IF amplifier. &127; Differential peak detector. &127; Easy adjustment. &127; Large output voltage. &127; Good limiter characteristic. &127; Wide operating voltage. &127; Low distortion. &127; Fewer peripheral parts. &127; Excellent AM rejection ratio.

Pin Name Description 1 Balanced Input 2 Balanced Input 3 Vcc Positive Power Supply 4 GND Ground 5 + Detector input 6 - Detector input 7 Audio Output

MB3712 5,7 Watt Audio Power Amplifier

Pin Name Description

1 Output 2 Vcc Positive Supply Voltage 3 4 GND Ground 5 6 Input 7 8 9 Vcc Positive Supply Voltage

file:///D|/Electronique/Schemas/P/President%20voir%20aussi%20Uniden%20&%20Tandy/JFK/Info%20fr.txt

Président JFK cette radio utilise une PLL uPD2816 et 120 modes canaux AM / FM une couverture de fréquence est de 26,515 à 26,955 26,965 à 27,405 Low Mid et de 27,415 à 27,855.

Amélioration de recevoir de gain Validation des la réception AM et l'amélioration de gain de signaux entrants est une demande commune auprès des opérateurs radio. Dans les premières étapes de l'entrée HF 2SC1674 transistor peut être trouvé. Ce transistor est responsable de l'amplification d'un des petits signaux détectés. Un des problèmes existent, si le transistor lui-même est bruyante comme c'est le cas par exemple de l'2SC1674 comparativement à d'autres paquets à faible bruit. Avec l'amplification des signaux entrants est le bruit des transistors. Le remplacement de ce transistor avec un gain plus élevé, le transistor faible bruit améliore grandement le rapport signal-bruit de votre récepteur. Nous allons utiliser un transistor 2SC2999 qui a bruit caractéristique gain plus élevé inférieur. Remplacer le 2SC1674 (T2) avec une 2SC2999 (ou similaire à faible bruit et un transistor à gain élevé) pour atteindre ce signal amélioré par rapport au bruit. Réajuster L1 et L2 Le gain sera amélioré avec plus de 6 dB avec le même signal sur bruit.

file:///D|/Electronique/Schemas/P/President%20voir%20aussi%20Uniden%20&%20Tandy/JFK/Info%20fr.txt [23/12/2011 18:51:52]

president jfk

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