URC-68 Receiver-Converter Module A3

© Brooke Clarke, N6GCE



 

Receiver-Converter Module A3

This module is the receiver for both FM and UHF.  I think one of mine is bad.
Here are some measurements using a Fluke 87 DMM in Ohms and Diode mode comparing a good module and a bad one.
All measurements made to ground
 

Bad A3 Module

 
Pin #
Description
Ohms
Diode V
1
UHF Sig In
infinity
 
2
FM Rx B+
infinity
 
3
UHF Rx B+
6.4 M
2.63
4
FM Sig in
infinity
 
5
+9n V In
14.8 k
2.28
6
10 MHz Out
GND
 
7
AGC In
9.84 k
2.455
8
Xtal
infinity
 
9
Xtal
473
.378
10
50 MHz Out
12.3
.011
11
200 MHz Out
53.5
.047
12
Common B+
4.44 M
2.32
13
UHF Tx B+
infinity
 
14
GND
   
15
GND
   
16
GND
   
17
GND
   


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