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©2005 Hamtronics, Inc.; Hilton NY; USA.  All rights reserved.  Hamtronics is a registered trademark.    Revised: 5/17/05

- Page 7 -

PARTS LIST FOR R302  
RECEIVER. 

 Note: Values which vary with freq. band 

are shown in a table at the end of the parts list.  
Resistors and capacitors are 805 smt type 
unless noted otherwise. 

0

 Caution:  IC’s are static sensitive.  Use 

appropriate handling precautions to avoid dam-
age.

 

Ref Desig  Value   (marking) 

 

C1 

1 µf electrolytic 

C2 100pf 
C3 0.1µf 
C4 not 

assigned 

C5 0.1µf 

 

C6 100µf 

electrolytic 

C7 not 

assigned 

C8 0.1µf 
C9 100µf 

electrolytic 

C10 0.15µf 

mylar 

(red) 

C11 .01µf 
C12 .001uf 
C13 2pf 
C14 100µf 

electrolytic 

C15 0.1µf 
C19 100µf 

electrolytic 

C22 4pf 
C26 .001µf 
C30 not 

assigned

 

C32 0.5pf 
C34 not 

used 

C36 4pf 
C40 .01µf 
C41 5pf 
C42 6pf 
C43 5pf 
C44 0.47µf 

electrolytic 

C45 0.1µf 
C46-C47 .001uf 
C48 0.1µf 
C49-C50 .01µf 
C51 220µf 

electrolytic 

C52 10µf 

electrolytic 

C53 1µf 

electrolytic 

C54 100µf 

electrolytic 

C55 .001µf 
C56 220pf 
C57 68pf 
C58-C60 0.1µf 
D1 

BB132 varactor diode 

D2-D4 

MMBT3904 (used as diode) 

FL1-FL4 

10.7MHz crystal filter 

 

  (matched set of 4) 

FL5 455kHz 

ceramic 

filter 

J1 RCA 

Jack 

L2 

0.33µH RF choke  

 

  (red-sil-orn-orn) 

L3-L8 

2½ t. ,slug tuned (red) 

L9 

0.33µH RF choke  

 

  (red-sil-orn-orn) 

Q1-Q2 MSC3130 
Q3 MMBT3904 
Q4-Q5 

BF998 MOS FET 

Q6 MMBT3904 
R1 180

 

R2 2.2K 
R3 2 

Meg 

R4 27

 

R5 10K 
R6 47K 
R7-R8  

2.2K 

R9 10K 
R10 6.8K 
R11 3.9K 
R12 180

 

R13 47

 

R14 15K 
R15 470

 

R16 3.9meg 
R17-R18 100K 

 

R19 47K 
R20 330K 
R21 15K 
R22 47K 
R23 

100K panel mount pot. 

R24 68K 
R25 100K 
R26 47K 
R27 510K 
R28 4.7K 
R29 680

 

R30 1K 
R31 22K 
R32 

100K panel mount pot. 

R33-R34 not 

assigned 

R35 47K 
R36 100K 
R37 2Meg 
R38 27

 

R39 100

 

R40-R42 27

 

S1 

11 pos. DIP switch 

T1 

10.7MHz IF xfmr  

  

 

(7A-691F) 

T2 

455kHz IF xfmr  

  

 

(T1003) 

T3 

10.7MHz IF xfmr  

  

 

(7A-691F) 

U1 

0

 MC68HC705J1A 

µP 

U2 

0

 LMX1501A 

PLL 

U3 

0

 

10.240 MHz TCXO  

U4 MC3361BP 

IF 

ampl 

U5 LM386N-1 

AF 

output 

U6 78L08ACD 

regulator 

U7 78L05ACD 

regulator 

Y1 

10.245 MHz crystal 

VALUES WHICH VARY WITH 
FREQUENCY BAND: 

R302-2 is 144.000 - 154.235 MHz 
R302-3 is 154.200 - 164.435 MHz 
R302-4 is 164.400 - 174.635 MHz 
R302-5 is 216.000 - 226.235 MHz 
R302-6 is 220.000 - 230.235 MHz 

Ref Desig 

-2 

-3 

-4 

-5/-6 

C16 10    

C17, 

C18  .001 .001 .001  390 

C20 12    
C21 68    
C23 

.001 .001 .001  390 

C24 27    
C25 62    
C27 

.001 .001 .001  390 

C28 27    
C29 68    
C31 20    
C33 20    
C35 18    
C37 27    
C38 82    
C39 1    

L1 2½T

(red) 

2½T

(red) 

2½T

(red) 

1½T

(brn) 

 

Содержание R302 Series

Страница 1: ...an be attached to a connector or feedthrough capaci tors used on the cabinet in which it is installed Be very careful not to route the wiring near the components on the left hand side of the board which contains sensitive loop filter and vco circuits which could pick up noise from the wiring Power Connections The receiver operates on 13 6 Vdc at about 200 mA peak with full audio Current drain with...

Страница 2: ...criminator is properly adjusted Do this by connecting a dc voltmeter to E4 Connect a signal generator set for 10 700 MHz to TP3 and set the level for a relatively strong signal so there is very little white noise Adjust dis criminator coil T2 for 3 3Vdc Then reconnect the signal generator to an tenna connector J1 and set it for the precise channel frequency You can also use a strong signal on the ...

Страница 3: ...ands a Set the SQUELCH pot fully counterclockwise and the VOLUME pot just a little clockwise b Connect speaker and 13 6 Vdc You should hear white noise c Set dip switches for desired frequency d Connect voltmeter to TP1 Ad just vco coil L1 for 2 0Vdc Al though the vco will operate over a wide range of tuning voltages from about 0 5V to 4 5V operation is opti mum if the vco is adjusted to 2 0V e Co...

Страница 4: ...nthe sizer are applied to synthesizer U2 by microcontroller U1 Everything the synthesizer needs to know about the band division schemes reference fre quency and oscillator options is gen erated by the controller Information about the base frequency of the band the receiver is to operate on and the channel within that band is calculated in the controller based on information programmed in the eprom...

Страница 5: ...ole board will be installed in a shielded enclosure so we elected to keep the size small by not using a separate shield on the vco However this means that you must use care to keep wiring away from the vco circuit at the right side of the board Having the board in a metal enclosure will shield these sensitive circuits from flo rescent lights and other strong sources of noise Because the frequency ...

Страница 6: ...no to 1 Vdc full quieting E4 Freq Varies with frequency of input signal Voltage at this point normally is ad justed for 3 3Vdc with a signal exactly on fre quency Can vary a little without being a problem Table 5 Typical Xstr DC Voltages Xstr Stage E S B G1 C D G2 Q1 vco 1 3 2 0 6 5 Q2 buffer 0 0 7 4 5 Q3 dc filter 6 8 7 4 7 6 Q4 RF ampl 0 0 7 5 3 8 Q5 Mixer 0 0 7 6 0 Q6 sq open 0 0 8 sq closed 0 ...

Страница 7: ...atched set of 4 FL5 455kHz ceramic filter J1 RCA Jack L2 0 33µH RF choke red sil orn orn L3 L8 2 t slug tuned red L9 0 33µH RF choke red sil orn orn Q1 Q2 MSC3130 Q3 MMBT3904 Q4 Q5 BF998 MOS FET Q6 MMBT3904 R1 180Ω R2 2 2K R3 2 Meg R4 27Ω R5 10K R6 47K R7 R8 2 2K R9 10K R10 6 8K R11 3 9K R12 180Ω R13 47Ω R14 15K R15 470Ω R16 3 9meg R17 R18 100K R19 47K R20 330K R21 15K R22 47K R23 100K panel mount...

Страница 8: ... 2005 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 5 17 05 Page 8 ...

Страница 9: ... 2005 Hamtronics Inc Hilton NY USA All rights reserved Hamtronics is a registered trademark Revised 5 17 05 Page 9 ...

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