Sounds like the audio panel is causing it, have you tried turning it off while this is happening? When its is off it should operate in a "fail safe" mode and the comm/side tone "should" be normal.
If you're hearing the radio normally when others talk then you know the audio connections from the radio all the way to the headset is good. The only thing that changes is the switching in the audio panel when you key the mic. Also you know the radio sidetone is working if you can hear it in the copilot headset normally.
Does the intercomm otherwise work normally?
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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