Radio interefrence at hi revs

[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.

[nicow]

What tipe,and how old are your spark plugs?

[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.

[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.

[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 ...