6K V1.02 03-16-91
151
INSTALLING THE S-COM 5K REPEATER CONTROLLER IN A
G.E. CUSTOM MVP REPEATER
1.
NOTE: These instructions were prepared from the G.E. Custom MVP Maintenance Manual
(LBI30163-G).
2.
Refer to the "System Audio-Squelch Board" section of the manual. The G.E. part number
of this board is 19C321920G1. The schematic is found on page 9.
3.
Receiver Audio: Prepare a length of shielded audio cable. Connect the inner conductor of
one end to the "hot" end of R922 (2k ohms). The "hot" end of R922 is the junction of R922,
C912, C931, and pin 8 of audio amp AR901. Connect the shield to the other end of R922
(ground). The other end of the cable goes to the 5K controller: Connect the inner conductor
to pin 13 (RX AUDIO). Connect the shield to pin 25 (GROUND). The volume pot will affect
repeat level.
4.
Repeater Receiver COR: Locate transistor Q903 (labeled "RX Mute") on the G.E. board.
Connect a wire from its collector to a 100k resistor. Connect a 47k resistor from the free
end of the 100k to ground. Connect a 2N3904 (or similar) NPN transistor as follows: Base
to the junction of the 47k and 100k; emitter to ground; and collector to a piece of wire.
Connect the other end of the wire to pin 6 of the 5K (RPT RX COR). (If you are shielding
this wire, the nearest 5K ground pin is 17).
5.
Transmitter Audio: Locate the connection labeled J913 MIC HI (it's found in the lower right-
hand corner of the schematic). Connect the positive (+) end of a 2.2 uF capacitor to J913.
Connect the other end of the capacitor to the inner conductor of a length of shielded cable.
Connect the shield of the cable to ground. The other end of the cable goes to the 5K:
Connect the inner conductor to pin 11 (TX AUDIO). Connect the shield to pin 22
(GROUND).
6.
Transmitter PTT: Locate the connection labeled J911 PTT (next to J913 from step 5
above). Or, you can use connection H17 if it's more convenient. Connect a wire from this
point to pin 10 of the 5K (TX PTT). (If you are shielding this wire, the nearest 5K ground pin
is 21).
Remember, pins 14 through 25 of the 5K's connector are all grounded for convenience in
hooking up cable shields.
