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Thanks for the fast reply! I'll go ahead and connect to that 10v square wave and see what happens.

I have a Lycoming O-320 with one magneto and one Lightspeed electronic ignition module. Connecting the left RPM wire to the P-lead was easy, but I don't know where to connect the right RPM wire. I bought a Westach tachometer transducer, but I found it only outputs an AC voltage proportional to...

I backburnered the radio noise problem in favor of some other jobs on my RV project, so it's been some months since I tried anything. Last week, I got on the radio again, and the motorboating was either gone or working at a very low volume. Some things I DID discover: Absolutely no...

Dave, thanks. I have terminated all shielded cables on only one end, with the exception of the antenna cable, which is terminated on both ends. I bought a bunch of ferrite cores and distributed them liberally. Didn't really help. I do have the name of a good avionics guy, and plan to call...

Upon the advice of one of my chapters electronics gurus, I connected all the various airframe grounds, then connected them to the battery's negative terminal.  This could have produced the deadly ground loop (which isn't as nice a term as "earth loop" ;D). However, disconnecting said...

The audio output from the D-100 is for AOA alerts, and I am using a separate AOA system for that, so I'm not using the audio output. I am using the audio output from my D-120, but that unit was turned off during my tests. I upgraded my antenna wire to RG-400U in case there was a problem with...

Some of the problems in this forum have come close to my issue, but not quite. I have a D-100 a DRE intercom, and a Garmin SL-40 comm radio. I have been going crazy trying to get rid of a motorboating noise when transmitting over the radio. A friend suggested the Dynon unit might be to blame...