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Thanks for the comments. And my solution is an avionics master as you suggest, so all good! J

Ha, ha, ha...I have a 4 and am a lawyer, so it would work for me! N95JF

Thank you very much. It still is not conclusive: it could be true that the transponder power supply (avionics power) could function, but that turning the display on and off would switch a transponder relay to avoid a situation where the display is not turned on and the transponder remains...

Thanks. When I get to that, I would be inclined to make up my own 50 cent diode...but there still is the issue of whether the transponder is switched by the HDX power switch. It would be great if there is a Dynon monitor who could chime in...??!! Thanks J

R: See page 4-17 Revision AF Best J

I can paw thru it after work. Thanks. J

Thanks...so, why do you think there is a requirement for the diodes? My understanding is that the diodes dissipate the spike, and they are required per the installation documents. I am hoping to end run that requirement by simply disconnecting the boxes from the system, but not sure that will...

Hi: I am installing an HDX800 with SV-261 transponder in my ancient RV4. I am keeping my old Rochester piper engine gauges, so I am not relying on SV for engine instrumentation and specifically oil pressure info on start up. The master switch and starter solenoid are difficult to access...