Today's Message Index:
----------------------
 
     1. 03:49 PM - Antenna troubleshooting (donjohnston)
     2. 05:10 PM - Re: Antenna troubleshooting (user9253)
 
 
 

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Time: 
03:49:53 PM PST US
Subject: 
Antenna troubleshooting
From: 
"donjohnston" <don@velocity-xl.com>
      
      
      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
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=447249#447249
      
      

Message 2


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Time: 
05:10:11 PM PST US
Subject: 
Re: Antenna troubleshooting
From: 
"user9253" <fransew@gmail.com>
      
      
      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.
      
      --------
      Joe Gores
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=447251#447251
      
      








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