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GM 300 16 pin connector use for microphone

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P25Radio

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Special project, can a mic be hooked up to the rear 16 pin connector to a Motorola Gm 300. Wiring diagram if any to do so?
 

ramal121

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The accessory connector has pins for mic, ptt and ground, so yes sort of. The mic pin doesn't provide dc bias to run the mic element. You would have to cook up a way to inject a few volts into the mic line.
 

SteveC0625

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Check ebay seller mre1032. He has the exact cable you want if you just want plug and play.

If you want to DIY, all the pinouts are on batlabs.com for the accessory connector and the mics. All four lines for the mic are available on the acc conn.

I usually use the precrimped pins and wires from mre1032. From the 16 pin acc connector, I hook them to an RJ45 female. This lets me plug in a mic like the hmn1035 or similar. You can also extend that with a CAT5 cable and F/F connector.
 

SteveC0625

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The accessory connector has pins for mic, ptt and ground, so yes sort of. The mic pin doesn't provide dc bias to run the mic element. You would have to cook up a way to inject a few volts into the mic line.
Not required. All lines are available on the standard 16 pin acc conn on the GM300.
 

cmdrwill

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We do know the RJ45 pins are numbered backwards in the radio schematics.

16 pin Mic jack RJ45 standard Motorola
Pin 7 BLACK Ground Pin 5 4

Pin 2 BROWN Mic Hi Pin 4 5

Pin 3 GREEN PTT Pin 2 6
.
 
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