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Radio interefrence at hi revs
Posted: Tue Oct 09, 2012 1:52 pm
by Biggles
I have an airmagic intercom, bunny ear aerial with regulated power supply. ICOMA23 radio; Garman 196 GPS.
This whole set up works wonderfully. Clear as a bell until I am at full revs. So climb out I get a high pitch screech. How is this getting through? Is the regulator not handling top rev interference?
Interference will come in and drop out sharply, like a stutter. It definitely feels like a threshold is being met and when exceeded the screech is let through.
Re: Radio interefrence at hi revs
Posted: Tue Oct 09, 2012 2:30 pm
by nicow
What tipe,and how old are your spark plugs?
Re: Radio interefrence at hi revs
Posted: Tue Oct 09, 2012 3:28 pm
by Biggles
Sparkplugs were changed less than 25 hours ago. The noise did not come in with the change. There was some rewiring that occured though as I put in a digital fuel level and fuel flow meter MGL.
Re: Radio interefrence at hi revs
Posted: Wed Oct 10, 2012 9:38 am
by mak
Biggles
I get the same thing at full RPM with my Filser ATR 833 radio. If I change my Squelch and Vox it eliminates this completely, but I feel by changing my squelch I might loose a weaker radio transmission signal so I endure the 30 seconds of screetching on take-off. I agree, it sounds like reaching a specific threshold opens this up.
Re: Radio interefrence at hi revs
Posted: Fri Oct 19, 2012 7:41 pm
by kloot piloot
Zulu might enlighten us.
Airmagic's beauty is that it is an independent circuit.
Last Sunday, on threshold prior take-off, I did my mag check. Dropping the one mag I got a "clack" sound in my headset ("clack" being a sound like a spark or lightning transmitted through the headset). Did the mag check another time, same clack, 3rd and 4th time it was gone. A magnetic field discharged ?
Uncle Zulu, please advise ...