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donjohnston
Joined: 13 Dec 2009
Posts: 231
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 Posted: Sat Sep 19, 2015 2:48 pm Post subject: Antenna troubleshooting |
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I've got (what I think is) a peculiar antenna problem.
Composite aircraft with foil antennas embedded in the wings per RST Engineering manual.
I have discovered that I couldn't hear anything on Com2. All aspects of Com1 work fine.
When I key the mic three times on Com2 (for airport information), I don't hear anything (no surprise). But if I switch to Com 1, I hear the announcement. Which indicates to me that the mic keying is being transmitted. (I haven't been able to do a voice check yet).
As a test, I swapped the antennas to the radios. The problem moves with the antenna. So I figure it's either a bad connector termination, bad cable, or bad antenna. I'm planning on checking for continuity between the center conductor and shield from the radio to and the last connector which should tell me if it's the cable.
Does anyone know of way to you have any suggestions as to how to determine if the antenna is causing the problem?
Thanks,
Don
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sat Sep 19, 2015 4:08 pm Post subject: Re: Antenna troubleshooting |
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It is highly unlikely that the cable is bad unless it has been pinched or bent with too small of a radius. The most likely problem is a bad connection between the coax and one of its connectors or between connector and antenna. The antenna foil could be cracked.
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donjohnston
Joined: 13 Dec 2009
Posts: 231
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| Posted: Mon Sep 21, 2015 1:43 pm Post subject: Re: Antenna troubleshooting |
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Problem identified and resolved.
The BNC connector on the wing root had a short. I really thought that I checked each connector when I installed them. Either I missed this one (likely) or the short developed after (unlikely but I'm going with that explanation).
Re-terminated and all is well.
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