Zenith Aircraft Builders and Flyers
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radio interference suppression J 3300
Hello I have exchanged my engine for the Gen 4.0 Jabiru 3300. The engine runs great, all temperatures in the normal range and enough power.
BUT, the engine interferes with the radio terribly.
On the ground with idle speed it is still OK, with engine off only on battery super !
But at higher speeds and travel speed of 2500rpm, the tower and other aircraft can no longer understand me. It only hisses in the radio.
Bervor I have to invent something myself, hence the question:
How can this engine be properly interference suppressed ?
Are there any experiences that work well ?
Oh, as an additional "problem" I use a Li-Ion battery and not a lead battery. This complicates things a bit more.
For remedy I would be very grateful.
greetings from germany
Cyrano
Replies to This Discussion
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Permalink Reply by John Burns on
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My system was fairly good with the Gen 4 engine and MGL avionics and radio, but you could hear the RPM change of the engine on the intercom. I do have separate grounds for every item directly back to a ground buss. There are not any items except engine sensors that use an air frame ground and the headset jacks are carefully insulated from the air frame with plastic washers. After that I purchased a set of snap over ferrite RF noise suppressors and put one inside the firewall around everything that comes through the firewall. One on each wire or wire bundle and one on each engine control cable. The set I bought does not seem to be available now, but any set that has the variety of sizes you need will work.
As always this is what worked for me. Your results may vary. Many thanks to other Jabiru installers who guided me in finding the Ferrites and making the initial installation as radio quiet as it is.
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Permalink Reply by Bob Simmons on
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Permalink Reply by Juan vega on
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https://www.dxengineering.com/techarticles/dxepressreleases/color-c...
i added this to my radio, and it blocked almost all the noise, then 100% when playing with squelch
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