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Radio Static

2007-10-08 21:45:27

Radio Static

I have been getting complaints from the control towers that I am transmitting a lot of static when I contact them. I have had the local avionics shop check my radio several times and they tell me it is ok.

It appears to be happening when I am at altitude and the rpm's are high. If I pull the power back, the static diminishes.

Any suggestions would be great.

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2007-10-09 06:03:23

Re: Radio Static

Thinking out loud here, but that sounds like what others have diagnosed as burned out diodes in the alternator. Might be worth a check. I don't know if the service manual discusses this, but I think there was something about measuring for AC on the DC bus. If you find some AC it means there are some are burned out. I think there are 3 or 6 of them.

Hopefully you will get another opinion here, because mine is probably worth twice what you paid for it!! ( 2 times zero is still zero! )

Good luck...

Rod

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Rod Richeson
PP ASEL since Mar 17, 2007
PP ASEL IA since September 27, 2007
1969 Cessna 172K

CerveloRod: 12 Posts

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2007-10-10 19:09:43

Re: Radio Static

Thanks Rod,

I will talk to my mechanic about your idea. I have had all of the connections checked and the radio bench tested. Running out ideas.

MHOUGH: 2 Posts

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2007-10-30 22:32:30

Re: Radio Static

Just visiting the forums and saw your post. Recently changed the capacitor on my 177RG alternator and found that cleaned up a lot of noise that effected the ADF low band. Not to expensive to try!