DB-25 connections:
Pin 4: PTT(one wire here and the other to ground from the existing remote PTT switch
Pin 7: Ground
Pin 6: Mic (Tx audio from headset to radio)
Pin 17: Rx audio(from radio to headset)
In ‘Edit’ select ‘Extended Function/Aux Tab’:
Set DB-25 pin:
4: Input, Ext PTT
In ‘Extended Function/Modulation Tab’,
-MIC PTT: Mic Line=Connect, MI2=connect, DI Line=disconnect, QT=Yes, STE=Yes
-External PTT(Voice): Mic Line=disconnect, MI2=Connect, DI Line=disconnect, QT=Yes, STE=Yes
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