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Wiring diagram for TalkAbout T400 headset


Nov 10, 2020
I have a couple of Motorola T400 TalkAbout radios. I also have a pair of headsets with boom mic (with PTT). We want to use them while bicyclying around. I find the VOX operation to be totally useless as you must speak (or make some kind of noise) for at least a few seconds before the TX kicks in, and then it stays keyed for a bit after you talk. The PTT works OK but is a little challenging while riding a bike (only one hand on the handle bar). I would like to add a DIY push-to-talk button near the hand grip. It seems the radio uses some kind of impedance change to key the TX as the PTT button appears to be across the mic line. Does anyone have any info on the headset wiring configuration (a schematic would be nice)?