Loading ...
Sorry, an error occurred while loading the content.

7235Re: [loopantennas] Re: loops and nearby objects

Expand Messages
  • richard
    Mar 1, 2010
    • 0 Attachment
      On Mon, 01 Mar 2010 12:12:59 -0000
      "shibukiau" <kubisl@...> wrote:

      > 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
      >
      >Hiya
      Well my loop is up in the garden now, and works surprisingly well.
      Its just under 4 mtrs dia, made from LDF4-50, which interfaces with 15mm Cu water pipe for the
      end terminations ect.At the moment I'm using a single 100 pF doorknob cab, which centers it on
      3.755 MHz.I now have the motor to drive a 100pF vacuum variable cap which is rated at 10Kv ,
      that'll allow 400W to be used.
      Still trying to sort out the cap mounting which has to be rock solid, or the belt drive to the motor
      will slip, and getting a position indicator back in the shack.
      --
      Best wishes

      Richard Bown

      ###################################################################################
      Registered Linux User 36561
      OS: Mandriva 2010.0 Powerpack on an AMD Dual Athlon 64 +4400: 8 GB RAM DDR2
      Ham Call: G8JVM , QRA IO82SP, Interests Microwave 1.3 GHz,2.3 GHz & 5.7GHz & 10 GHz
      ###################################################################################
    • Show all 13 messages in this topic