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©1995 Hamtronics, Inc.; Hilton NY; USA.  All rights reserved.  Hamtronics is a registered trademark.    Revised: 10/23/02  

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FL5

LONG DRAIN LEAD

+

_

DISC. TP-3

1

8

4

5

U2

Audio Out.

1

16

8

9

U1

IF Ampl.

+

_

Q1

LONG DRAIN LEAD

Q2

L1

L2

L3

L4

+

_

SIG. LEVEL TP-2

OSC TP-1

FL1

FL2

FL3

FL4

Q3

Q4

Q5

U3

Y1

Y2

LETTERING ON F.E.T. MUST BE

DRAIN

SOURCE

GATE 1

GATE 2

Q1 & Q2

TOP VIEWS

  U3  

OUTPUT   GND  INPUT

E   B   C

Q3-Q5

VISIBLE FROM TOP OF BOARD

C27

C26

C10

R3

C11

C

7

C

8

C

9

C

5

C

6

Z1

C12

C13

L9

L5

Z2

Z3

C39

C14

C40

C25

R7

C24

C23

C1

R1   C3  R2          C2            J1

R23

E4 - COS

E5 - DISC.

E1 - REP. AF

E2 - SPKR

E3 - PWR

R8

C29

R13

R14

C31 C30

CR1

CR2

R16 R15

C32

R18

C33

C34

R17

C37

R22

C38

C28

C35

C36

R20

VOLUME

SQUELCH

R10

R9

R11

R6

R12

C15

C16

R19

R4

C17 C18

R5

C20

C21

C22

L6

L7

L10

Z4

R21

C43

C41

C42

L8

C19

OV-1 XTAL OVEN OPTION

C4

Figure 1.  R100 Receiver, Component Location Diagram

+

_

10.7 MHz TP-4

 

Summary of Contents for R100

Page 1: ...board Seat the transistors as close to board as possi ble without straining leads Solder leads under board d The crystal filters must be in stalled with uncoded ends to the out side world and the ter...

Page 2: ...er terminal can re sult in ic damage The receiver can also drive higher impedances like 1K to 10K input impedances of COR boards etc There is no need to load down the output to 8 ohms Note that the au...

Page 3: ...uning response is an S curve so if you turn the slug several turns you may think you are going in the proper direction even though you are tun ing further away from center frequency 3 3Vdc f Connect s...

Page 4: ...t the speaker the audio ic may have been damaged by reverse polarity or a transient on the B line This is fairly common with lightning damage If no audio is present on the vol ume control the squelch...

Page 5: ...V U2 4 0V U2 5 0V U2 6 7V U2 7 13 6V U2 8 6 8V Typical Audio Levels Following are rough measure ments of audio circuits using an os cilloscope Measurements were taken with no input signal just white n...

Page 6: ...xtal filter set FL5 455 kHz ceramic filter 20 kHz bw blue J1 RCA jack L1 L4 2 1 2 turns red L5 10 7 MHz IF transformer p n 7A 691F L6 L7 6 1 2 turns blue L8 L9 2 1 2 turns red L10 455kHz IF transform...

Page 7: ...GATE 1 GATE 2 Q1 Q2 TOP VIEWS U3 OUTPUT GND INPUT E B C Q3 Q5 VISIBLE FROM TOP OF BOARD C27 C26 C10 R3 C11 C 7 C 8 C 9 C 5 C 6 Z1 C12 C13 L9 L5 Z2 Z3 C39 C14 C40 C25 R7 C24 C23 C1 R1 C3 R2 C2 J1 R23...

Page 8: ...ER 8VDC 8VDC TP 1 OSC INJ Q4 MULT C1 C2 C4 C5 C6 C7 C8 C10 C15 C16 C17 C18 L1 L2 L3 L4 L8 L9 R3 R6 Y1 Q3 OSC MULT FL1 C9 L5 FL2 FL3 FL4 IF SIGNAL 10 7 MHZ L6 Z1 Z2 Z3 Z4 J1 ANT C3 R1 R2 C11 C12 C13 C1...

Page 9: ...C41 C43 0 1 uf monolithic 104 CR1 CR2 1N4148 p n may not be marked FL1 FL4 10 7 MHz matched xtal filter set FL5 455 kHz ceramic filter 20 kHz bw blue J1 RCA jack L1 L4 2 1 2 turns red L5 10 7 MHz IF...

Page 10: ...ectrolytic C37 0 15 uf polyester red C38 470 uf electrolytic C39 68 pf np0 C40 220 pf 221 C41 C43 0 1 uf monolithic 104 CR1 CR2 1N4148 p n may not be marked FL1 FL4 10 7 MHz matched xtal filter set FL...

Page 11: ...or YMC 15002 or T1003 Q1 Q2 N E C 3SK122 or Philips BF 988 dual gate mos fet Mstatic handling pre cautions required Q3 2N3563 or 2N5770 Q4 not used Q5 2N3563 or 2N5770 R1 R3 100K R4 R5 15K R6 680 R7...

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