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Pinout info for APX 8500 or HMN 1090

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CJHardin

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I need to connect an APX 8500 to an aircraft audio panel. Tech support was essentially useless. I need to know the location of the following:

Audio + and -, Microphone + and -, and PTT.

I thought that I could just get an HMN 1090, chuck the potato, and use the wires to connect direct but from what I understand, since I'm using an O3 controller/mic, the second mic input is rendered useless. Is that true? I don't want to break into the O3 to connect. You'd think that there would be a solution on the 26 pin connector on the radio.

Either way, anyone have a pinout of the 9 pin connector for the mics?
 

MTS2000des

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There is. Everything you need is on the J2 connector. Much cleaner to interface I/O there anyway. Don't think the O3 head should be an issue if you're using the J2 get your PTT, flat audio in/out, from there.
 

CJHardin

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There is. Everything you need is on the J2 connector. Much cleaner to interface I/O there anyway. Don't think the O3 head should be an issue if you're using the J2 get your PTT, flat audio in/out, from there.
Awesome. I think that I just found a pinout too. Whew! Big relief.
 

CJHardin

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May 27, 2020
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Check this out. This is how DC headsets are wired in the aircraft we have.
Other vendors' hardware will probably be the same on the radio side.
Sweet, that is helpful, and exactly what I needed.
A bit surprising that the Motorola tech support people couldn't supply that.
Oh well, I found a solution and also a great forum!
Thank you.
 
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