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Adam O'Connor of Michigan Avionics was kind enough to provide the following in direct response to my question:
The source of ground for the switch does not matter. The other side of the switch must go to the "Ax" input pin. The "G" pins exist as a ground reference in case there isn't an easy way to grab one elsewhere
The trouble is, I am using two Tosten CS-8 sticks on which the 'Trigger' PTT switch shares its common line with three other buttons that I need to use to activate other pre-programmed functions (including Flip Flop). If I ground these switches differently then PTT has two different routes to ground and I may have created a big screamin' ground loop. I see three options:
Go ahead because no ground loop will be generated merely by connecting the tip and shield of the MIC circuit.
Ground the common line for all 4 buttons on the Microphone Ground pin (pin 11) of my V6 radio.
Ground the common line on V6 Microphone Ground pin 11 AND ALSO on the corresponding "G" pins of their digital inputs on the Analog/Digital Inputs connector of the iBox.
Anybody got any reasoned preferences or other suggestions?
Loman
Arklow, Ireland
Vans RV9 Tailwheel Tip-up. Slow, (very slow) build
O-320, Full MGL system
Airframe complete, currently installing FWF and electrical systems