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Re: Half Loop Mag Mobile Antenna

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  • Gian
    Hi Andy, ... I have a two bars roof rack across it (add-on). Would it be necessary to connect the loop mirror side to it or isolate it as strong current may
    Message 1 of 17 , Jun 26, 2013
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      Hi Andy,

      --- In loopantennas@yahoogroups.com, Andy <ai.egrps@...> wrote:
      >
      > Gian <i7swx@...> wrote:
      >
      > > ... i.e. what happen to RF currents un the mirror part of the loop and on
      > > the car real roof.
      >
      > For a half loop that connects to the roof on both ends, at the very
      > least you have the loop current itself which completes its circuit via
      > the roof. There would be some spreading out of the current in the
      > roof, depending on frequency, I suppose.

      >
      > Many mobile loops are complete loops that happen to rest slightly
      > above the roof. That's a good question what happens in the roof in
      > that case. I bet it depends a lot on loop orientation. Most of these
      > small mobile loops are vertically oriented, but I have seen horizontal
      > loops above the roof too. It would seem like the roof causes a
      > "shorted turn" that is close coupled to the loop, which is probably
      > not good.

      I have a two bars roof rack across it (add-on). Would it be necessary to connect the loop mirror side to it or isolate it as strong current may spread ???


      Best 73

      Gian
      >
      > Regards,
      > Andy
      >
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