Jay, Ed & All... Thanks for the pinout list and RSS advice, I'll try all of that tonight.
In case it matters... The RSS I'm using is for the GM300's, which works great for those radios, I can program the option pins on the accessory connector with this software; when connecting a M120 and using the same software, I have the ability to program the radio, but I loose the option to customize the pins! This doesn't make sense! Again, what I'm seeing doesn't match even the service manual listing below, two of the pins see a 0.00vdc voltage at idle, and a 6.56vdc change when a valid signal is received. Thanks everyone! Justin --- In [email protected], Ed Yoho <[EMAIL PROTECTED]> wrote: > > jwpauler wrote: > > >Good Afternoon everyone... > > > >I have two Motorola Radius M120 mobile radios, each listing a model > >number of M44GMC20A3AA. As far as I can tell (from looking at the > >front and what's in RSS) these are two channel units, have the 40W > >P.A. and include the 16-pin accessory connector. > > > >These units are going to be interfaced to a repeater controller for > >use as a portable repeater, but I'm having a heck of a time finding > >the correct pinout of the accessory connector. All of the diagrams > >I've found so far refer to a "8-channel" or "16-channel" Radius and > >while those diagrams get me close, some parts are missing. > > > >For example, I'm finding COR/COS on the first top and bottom pin on > >the far right side (I think that's 15 and 16), but no diagram anywhere > >lists COS at that point. I have checked to see if there is any > >customization option from within the RSS (like the GM300's) and there > >isn't. > > > >Right now I have the following working: TX AUDIO, PTT, TX GND, RX GND > > > >I'm trying to find/confirm: RX AUDIO, COR/COS > > > >Can anyone help? > > > >Justin > > > > > > > Justin, > > From the M120 service manual: > 1 External Speaker Negative > 2 Microphone Audio 80mV RMS @ 60% Deviation > 3 Microphone PTT > 4 External Alarm (not supported) > 5 Flat Transmit Audio 150mV RMS @ 60% Deviation > 6 Not Used > 7 Ground > 8 COR Output / Receiver Unsquelched Indicator > 9 Emergency Alert Input (not supported) > 10 Ignition Control Input > 11 Discriminator Audio Output 600mV RMS > 12 Not Used > 13 Switched A+ 0.5A Max > 14 Remote Hook Switch (ground for PL RX) > 15 Internal Speaker Positive > 16 External Speaker Positive > > Pins 15 to 16 are normally jumpered to enable the internal speaker > > > Ed Yoho > WA6RQD >
