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Motorola desk mic TU536-1 mod

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smorris

smorris

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Hey there! I want to modify this old mic to work my Astro Spectra. Does anyone have a wiring diagram or Pinout for this mic. It looks like it can key up two seperate transmitters. I don’t think the other key is PL defeat. I know the Spectra uses bare bones 4 wires to TX, GND, PTT, SPK- and SPK +. If this mic can operate two transmitters, it only uses 2 wires? Where’s PTT? There is a yellow ground wire that is bonded to the metallic sheath under the black outer jacket.
 

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Project25_MASTR

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One button will be for monitor, the other PTT (back in the days when more people would monitor before transmitting). Both work by pulling the pin to ground (the PTT line and monitor line will have a floating voltage on them). For an Astro spectra, I'd interface via the rear connector.
 
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