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967Re: [loopantennas] Re: Transmitting loop

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  • Henry Kolesnik
    Aug 2, 2005
    • 0 Attachment
      Dave
      I just wanted to point out that finals cannot dissipate power. All modern solid state finals have a protection circuit to decrease power output it the SWR rises so the resultant voltage can't damage the transistors. You can disconnect the antenna and power output will drop to zero fast so fast there's no damage. In TV stations that have long transmission lines a reflection ghost can be seen from the re-re-reflections if the SWR is not close to 1 to 1.

      ----- Original Message -----
      From: dldorrance
      To: loopantennas@yahoogroups.com
      Sent: Monday, August 01, 2005 7:21 PM
      Subject: [loopantennas] Re: Transmitting loop


      Hank, thanks for the distinction. However, even if the wave is
      re-reflected (back and forth around the speed of light about 1.6
      million journeys per second, to us mortals, for all practical purposes
      there remains a high voltage wave which is "standing" ie not moving,
      at the final transistor (or tube). Remember the wave tanks from high
      school physics? Those waves don't appear to move. They just stay
      put.

      Dave WA6YSO

      --- In loopantennas@yahoogroups.com, "Henry Kolesnik" <kolesnik@s...>
      wrote:
      > Reflected power does not heat up finals, it is re-reflected. High
      swr might exceed the voltage rating of the final transistors but
      reflections will not heat the finals.
      >
      > 73
      > Hank WD5JFR




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