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  1. G

    Approach "Not recieving Transponder recycle..."

    For the transponder antenna, just make sure that the base of the antenna has a good low resistance connection - less than 1 ohm - to the ground plane and that the resistance across the antenna connector is infinite. For the VHF antenna the wavelength is 92 inches or so. I don't see that the...
  2. G

    Approach "Not recieving Transponder recycle..."

    Non-circular ground planes should work just fine. Circular will work just fine as well. The lobes in the elevation plane that Trig worries about are near zenith (straight up) if the antenna is mounted on top and near nadir (straight down) if the antenna is mounted on the bottom. The gain on the...
  3. G

    Approach "Not recieving Transponder recycle..."

    I would be interested in Trig's response.
  4. G

    Approach "Not recieving Transponder recycle..."

    For the ground plane installed on the inside skin of a carbon fiber honeycomb the problem is that the carbon fiber composite is several thousand times less conductive than aluminum. So what you have is a highly conductive ground plane covered with a lossy (carbon composite) layer. RF energy will...
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    Approach "Not recieving Transponder recycle..."

    I don't want to belabor this issue of the RF performance of antennas and associated ground planes, but it should be obvious that I have a passion for antenna technology. It is difficult for me to accept technical performance anecdotes (with neither accompanying measured data nor validated...
  6. G

    Approach "Not recieving Transponder recycle..."

    I am a retired Boeing technical fellow. My engineering specialty for 36+ years was electromagnetics with an emphasis on antenna design, analysis and measurement. Virtually all Boeing products possess multiple antenna systems that collectively occupy a large portion of the electromagnetic...
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