ZETRON 37-MAX, Installation Manual

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Section 5. Installation
5-20
Connections to a Motorola R100 Repeater Station
For: Zetron Model 37-MAX
To: Motorola R100 Repeater Station
Using: 709-7179 Generic Radio Cable
37-MAX End
Function J1
pin# Wire
Color Radio End
Connection/Notes
+12 volts DC 1 RED JAUX, pin-3, A+
Ground 2 BLACK JAUX, pin-14, Desk Set Ground
Discriminator Input 3 WHITE JAUX, pin-25, uncommitted
Ground 4 BRAID No connection
TX Audio Output 5 BLUE JAUX, pin-5, Audio from Phone Patch
Ground (spare) 6 N/C
PTT Output 7 ORANGE JAUX, pin-4, PTT
Ground 8 BROWN JAUX, pin-6,
COR Input 9 YELLOW JAUX, pin-12, Audio Control
CTCSS/DCS Encode 10 GREEN JAUX, pin-23, uncommitted
Radius R-100 Configuration
1. Install a jumper from U601 pin-9 on the TX Command Board to JAUX pin-23 (an unused
pin). This routes CTCSS/DCS modulation from the 37-MAX to the TX Command board.
2. Install a jumper from U551A pin-4 on the RX Command Board to JAUX pin-25. This
routes unfiltered discriminator audio from the receiver to the 37-MAX.
3. Program the R-100 for carrier squelch operation and disable repeater operation using the
RPTR Disable Switch on the RPT Control Board.
4. If the R-100 was not ordered with the DPL Option (i.e. it was ordered for PL only or
Carrier Squelch operation), then there are several capacitors which need to be changed in
the receiver and transmitter to support DPL operation with the Model 37-MAX. Consult
the R-100 service manual for additional information concerning what capacitor values
require changing.
5. Repeated audio from the Model 37-MAX will be heard in the local speaker of the R-100
if the 37-MAX's TX audio is connected to JAUX pin-5. This is because the audio at pin-5
goes to several points in the R-100 (Local Audio Amp, Exciter Board, and the Line
Output) as well as the TX Command board. If desired, the repeat audio can be applied
directly to the TX Command board at the emitter of Q601.