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7234Re: loops and nearby objects

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  • shibukiau
    Mar 1, 2010
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      Hi Richard -- I just read your request for info!!

      Due to antenna restrictions, I use a homebuilt 6 ft dia loop on 80/40m inside my aluminum clad garage alongside my car and still able to work out almost as well as others with average dipoles! The car will shift the tune point a bit and probably doesn't help much but it does work! The Q will be affected more by the loop material and resistance of the loop/cap assembly than anything else!

      If you have to mount the loop on a mast I'd go for the aluminum mast, I use one myself and it doesn't appear to affect it!

      BTW -- a good cost effective loop can be made out of 7/8 inch Heliax, which is what I used. This stuff can be found used at most fleamarkets for next to nothing as many of the cell towers are removing it due to new equipment configurations! My loop uses about 19 ft of Heliax and a dual gang air variable cap turned by a DC motor feed over the coax from a MFJ loop control box! Very simple but effective!
      I also use the MFJ loops, the 20-10m one is a good performer and easy to use!!

      If you would like more info on how to make one for 160m Google "vk4amz" as he has a nice web site describing his 160m loop. I've seen his and have heard him on the air. He does extremely well compared to other stations using full size antennae!

      Main thing is don't be discouraged, just go ahead and try it as I guarantee you will be impressed by the performance of a well built loop!

      Cheers!
      VK4ERQ/VE3ERQ

      --- In loopantennas@yahoogroups.com, richard <richard.bown@...> wrote:
      >
      > Hi all
      >
      > Now I've got this 12' dia loop nearly constructed, how critical are loop to nearby objects ?
      > ie could I mount it on the side of the tower with say a 4' standoff between the tower and the
      > loop ?.
      >
      > Or could I mount it on a 2" dia Aluminium pole fixed at the top and bottom with just 1" separation
      > between the loop and pole ?
      > TIA
      > --
      > Best wishes
      >
      > Richard Bown
      >
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