MCS2000 External Audio In

[RAMcneill]

Gotta question for an MCS 2000 guru.

I am using a pair of the 220mhz MCS2000 radios out of Indonesia as a repeater. For the controller I am using Allstar. Works great!!! Have a small muffin fan blowing on the heat sink of the transmit radio and it is cool as a cucumber after long
QSO(s).

So, based on that success I decided I wanted to retire my 440 repeater that is a Master Exec II mobile and replace it with a low power MCS2000 as the receiver and a high power UHF MCS2000 as the transmitter, built up the Allstar node computer, used the same cable configuration as the 220 setup and everything is working except I am not getting audio through the transmit radio, swapped it out for a mid power model and audio passes fine. I tried another mid power and it did not work.

I am putting the audio in on PIN 24 of the accessory connector. That pin's designation is AUX TX IN2. AUX TX IN1 and AUX TX IN3 are internal and are fed by connectors on the circuit board. I do know that only one of the three can be active at a time. The internal ones are on opposite sides of the circuit board. I opened the radio and checked the one I could see and there
is no module plugged in there. I cannot find a place in the CPS that has anything to do with these connections.

I found a brief mention of AUX Input in the service manual but I do not know if it is related. It is in the control head trouble shooting section where it associates the AUX input with having pin 7 of the mic connector shorted to ground. I did that to no avail.

When I go into the radio tune menu and select F to toggle transmit with test tone, the radio keys up but the tone is not being passed. It is a 1k test tone I believe.

Short of getting the AUX input working can someone point me to a good place in the radio to inject the X audio? The radio is a high power low range UHF...

Any ideas?

[motorola_otaku]

Try pin 23 - Ext Mic In. I had to use that on a bunch of VRM650s.

[RAMcneill]

Well thanks OTAKU... That worked. The mid power radio that worked on PIN 24 threw me off. I had not tried that pin... Works like a champ... Now to put a fan on it and connect it to WINS or WAN and see how the transmitter does with a lot of traffic on it...