Section 5. Installation
5-30
Connections to a Uniden ARU-251K Repeater
For: Zetron Model 37-MAX
To: Uniden ARU-251K
Using: 709-7179 Generic Radio Cable
37-MAX End
Function
J1
pin#
Wire
Color
Radio End
Connection/Notes
+12 volts DC 1 RED Pin 6
Ground 2 BLACK Pin 8
Discriminator Input 3 WHITE Pin 8
Ground 4 BRAID No connection
TX Audio Output 5 BLUE Pin 7
Ground (spare) 6 N/C
PTT Output 7 ORANGE Pin 1
Ground 8 BROWN Pin 8
COR Input 9 YELLOW Pin 2
CTCSS/DCS Encode 10 GREEN Pin 9
Uniden ARU-251K Configuration
1. Install a wire jumper on the accessory jack between pin 4 and pin 5 (Audio Amp Out to
Speaker In).
2. Disconnect the Tone Encode lead from the Exciter at FT18 on the Exciter case, leave the
wire disconnected.
3. Attach a wire from FT18 on the Exciter case to pin 9 on the accessory connector. This
provides a path for the CTCSS encode from the tone panel to the transmitter exciter.
4. Set the Control Board switch to Carrier Squelch position.
5. Set the Front Panel switches to Local and Monitor.
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