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Modifying a Motorola RMN5052A

B

Barghest

Newbie
Joined
Aug 21, 2025
Messages
1
Hi guys, I recently picked up a Motorola RMN5052A fist mic for cheap on eBay, with the though to modify it to be an XLR output, while maintaining the push-to-talk functionality. For anyone wondering why, it's because I'm a live sound engineer, and I think it'll be a fun talkback mic rather than a typical SM57.
Anyway, I've been doing a little Googling, but I've not been able to track down a circuit diagram or pinout or anything that'll clue me in to which internal lead does what, and given that I don't really mess with radio equipment (of the kind that you guys are interested in, at least) I don't know what extra functionality would be existing with the mic that'd require being connected to the proper radio to be active.

Any help you can offer would be much appreciated.
 
prcguy

prcguy

Member
Joined
Jun 30, 2006
Messages
17,550
Location
So Cal - Richardson, TX - Tewksbury, MA
Most Motorola mics are electret condenser types and require a bias voltage, maybe 8 volts or so. The bias voltage is usually on the mic hot audio line, so you would need to make an interface to insert the voltage then strip it off to the console. Not sure if you can easily reduce 48v phantom down to 8 volts so you might need a battery or other power source for the mic.

In the end it might be easier to replace the guts of the Motorola mic with a dynamic cartridge to feed the board.
 
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