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ICOM A220T as Com2 with GMA 340


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11 hours ago, Dimmer said:

I am adding the A220 as Com2. Need info on whether the Com2 Key on GMA 340 goes to pin 16 (PTT) on the A220, or to pin 9 (GND) on the A220?  The instructions are a bit vague. Any insight would be appreciated.

 

Thanks in advance.

the trigger on the GMA output should ground the pin on 16.  It's labeled as an input on the 220, but in reality the GMA is pulling the pin low.

 

so pin 16 on the 220 should go to whatever pin COM2 Mic Key Out is on the 340

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