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Re: loops and nearby objects

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  • shibukiau
    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
    Message 1 of 13 , 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
      >
      > ###################################################################################
      > 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
      > ###################################################################################
      >
    • richard
      On Mon, 01 Mar 2010 12:12:59 -0000 ... Well my loop is up in the garden now, and works surprisingly well. Its just under 4 mtrs dia, made from LDF4-50, which
      Message 2 of 13 , Mar 1, 2010
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        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
        ###################################################################################
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