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madriver42(at)gmail.com
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 Posted: Mon Nov 29, 2010 8:53 am Post subject: Radio noise |
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I know this has been discussed before but like to ask anyway. I installed an old RST 360 com radio in my 701 panel and when I start the "Rotax" it is very noisy. Seems to be a whine don't know whether or not this is alternator or ignition. Saw a wiring diagram for another radio which stated that you must install a 22,000uf capacitor in series on the 12v feed when used with the Rotax engine installation. Will this cure the problem? Your valued thoughts please.
Phil Smith
CH 701 - Flying
Buhl, ID
[quote][b]
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dashwood
Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada
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| Posted: Thu Feb 17, 2011 8:06 pm Post subject: Re: Radio noise |
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yes it will help . if the noise is bad you could also put a cap in the power line as close to the radio as possible. put one on the (-) side as well.
there has been discussions about a ferrite wrap /clip that is available for in line filtering.. the lines from the generator to the regulator should be shielded to ground as well. the antenna wire should have the braided shield up to and as close to the antenna contact as well. the coax connection on the back of the radio should be checked for good contact and fit of all wire/shield/outer covering. an SWR test should be done on the radio/ antenna as well. get it down to 1:1 anything higher will cause radio static and poor signals incoming and outgoing. see a radio tech for this test or buy your own SWR bridge from an electronics store. a useful tool.
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Ross Alexander: CH701 driver 912ul 788tt
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