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What about you unplug mic and use XMIT button?
Is it also happening in CW when you press CW key?
Also check PS voltage. Best is to measure on pin 7 ACC socket.
Votage drop is common problem with PLL lockups in those radios.
Mike
Only way to stop it is to unplug the mike, bad mike?
I do have a D104 laying around, anyone know how to wire it to the 8 pin Icom?
It has red, white, black and bare/shield wire.
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