riffeljl(at)gmail.com
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 Posted: Sat Feb 14, 2009 12:05 pm Post subject: Weird Problem |
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I just fixed a weird problem and thought I'd share it in case anyone else has been going nuts with something similar.
I had a radio shop (Nolan Avionics in Durant,Ok – which I can no longer recommend) build my wiring harness. My com2 (Icom A200) worked fine – but com1 (GNS430) didn't. After a lot of work I finally figured out that some wires had been forgotten on the harness. So I contorted my 60 yr old creeky body upside down, over the spar and into the foot well, taped my trifocals on upside down so I could see, practiced my Navy cursing and got them installed.
Now the weird part. When I keyed the mic on com1, my EIS amp gauge showed negative amps. The sensor is between the alternator and the battery – so technically that "can't happen". Also the altitude servo would chatter and go into a climb when I transmitted on com1. Com2 was fine. I thought about a short – but the fuses were fine, and I thought a short would cause a high amp reading instead of a negative one. I thought about the alternator/voltage regulator – but ruled that out after calling Plane Power. I ruled out the amps sensor and the EIS because the readings were fine – except when I keyed the mic on com1. I was going nuts (and that's a short trip for me)!
Last week I finally called Grand Rapids to see if they had any ideas why their sensor would go negative – they'd been very helpful in the past. "Sandy" was equally perplexed and handed me off to "Greg", the owner. He listened politely and we discussed things. Finally he said he thought it was radio interference. He was familiar with TruTrak autopilots and thought my altitude servo problem was radio interference too. He suggested some noise filters from Radio Shack. I bought 3 different types but liked the 273-069 (about $3 for a package of 2) the best. I put a couple of them on both antenna leads at the antenna end. Worked like a charm.
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