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--- Help! Massive magneto interference on the radio (https://sbeaver.com/cgi-bin/fournier/cutecast.pl?forum=11&thread=1179&page=)

Posted by Rogier on Sunday, May 7, 2017 @ 04:53 PM:

Hi everyone

I just started flying the RF-4 I recently bought. The previous owner just had Trig radio fitted and I am not sure if he flew with it. I just had the magneto overhauled.

When using the radio I have massive interference and I am pretty sure it comes from the magneto as the radio works fine when the engine is not running and when the engine is running the inference becomes worse as I increase throttle. It also impacts handheld radios if kept near the aircraft.

Does anyone have any idea how to solve this problem? Is anyone using a magneto noise filter and is there enough space to connect it to the bendix mag? Anything else I should try first?

I would be interested to hear your thoughts.

Thanks!

Rogier


Posted by SteveBeaver on Sunday, May 7, 2017 @ 07:40 PM:

Use a magneto filter, and ensure that the magneto 'P' lead uses a shielded wire that is grounded ONLY at the magneto end. When the engine is stopped, the shielded wire inner wire should connect to the outer shield.

Posted by Rogier on Tuesday, May 9, 2017 @ 01:38 AM:

Thanks Steve - I have ordered one so let's hope that will solve the issue!

All the best

Rogier


Posted by D. Porter on Wednesday, May 10, 2017 @ 02:27 AM:

Quote:
Originally posted by SteveBeaver

ensure that the magneto 'P' lead uses a shielded wire that is grounded ONLY at the magneto end.


That's how I fixed my radio interference, it was originally grounded at both ends. No magneto filter was necessary.

--------------------
Don
RF4D #4054 N1700F Rectimo 1400cc


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