I just wired two radios in a RV6 with a DPDT PTT select switch, which just switches the PTT lines for both radios. No audio panel. This same thing could be implemented with one momentary DPDT switch. No need to switch the mic lines, as the mic audio is split from the intercom going to both radios. Both radios should have transmit inhibit lines tied to each other which reduces the sensitivity of the non-transmitting radio while the other is transmitting.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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