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cdm 1550 repeater question

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Oct 20, 2016
So I'm trying to set up a cdm 1550 repeater. I've got one of the accessory port cables. I've done some research and everyone seems to have good luck with them. Duplex repeater Interface cable Motorola radio CDM750 M1225 CM300 GM300 CDM1550 | eBay

When I connected mine, I had to program pin 8 for the COS, which seems to be working. When either radio receives a signal it will key the other radio. My problem is that I have no audio between radios. From what I've researched, the audio pins are not programmable. Is there something in the setup that I don't have correct? Any other ideas would be greatly appreciated.


Database Admin
Jun 14, 2005
Connector 1 pin 2 ---> Connector 2 pin 11
Connector 1 pin 3 --->Connector 2 pin 8
Connector 1 pin 7 ---> Connector 2 pin 7
Connector 1 pin 8 ---> Connector 2 pin 3
Connector 1 pin 11 ---> Connector 2 pin 2

Set pin 8 in radio programming to "PL & CSQ?Talkgroup Detect" on both radios, low and debounce check.

Pin 2 is mic audio, pin 11 is rx audio


Jun 17, 2014
Memphis, TN
I have two Motorola CM200's and trying to setup a repeater between both.
I have: https://www.amazon.com/Generic-gsd-Repeater-Interface-Motorola/dp/B01DD0XMQM/ref=sr_1_1?ie=UTF8&qid=1478021378&sr=8-1&keywords=pm400+repeater+cable

Can anyone please help me to know what to set within the program to get these to work? I tried setting pin 8 to PL/CSQ Talkgroup Detect with low and debounce but I do not see a Pin 2 or Pin 11. only pin3,4,6,8,9,12,14. I have the Accessory Package set to Default. Do I need to change this? I appreciate any and all help as I am new to this. Thanks

Edit: I am now able to get it to work but no audio is being carried.
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