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Build a Magnetic Loop?

Discussion in 'Amateur Radio Antennas' started by BenMara, Dec 1, 2017.

  1. BenMara

    BenMara
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    W9WDX Amateur Radio Club Member

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    Recently watched this vid. Now im thinking about adding a magnetic loop to my antenna arsenal (farm).


    What do yall think?

    Current antennas are Hexbeam (20-10m), (OMTA) Offset Multiband Trapless Antenna (vertical 40-10m) and 80m wire fed with window line (50' above ground at feedpoint).


     
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  2. sp5it

    sp5it
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    Master of puppets

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    You can't have too many antennas :)
     
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  3. 2RT307

    2RT307
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    I'm with sp5it. :) I've heard they are great for receiving, especially on 160 where things are so noisy all the time. My coolest antenna I made recently was a tape measure yagi for 2 meters. Ha!

    Let us know how you make out. :)

    73,
    Brett
     
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  4. BenMara

    BenMara
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    Only problem i see is the variable capacitor. And to make it 100w+ compliant
     
  5. BJ radionut

    BJ radionut
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    Yep Commercial Grade vacuum variable...Jennings/Comet/Russian equivalent is about your only options at that power level...100w PEP+ requires pretty high voltage like 5K VDC or possible more depending on construction.
    Then mounting and tuning are other hurdles.
    GL
    All the Best
    Gary
     
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  6. BenMara

    BenMara
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  7. Captain Kilowatt

    Captain Kilowatt
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    Better get the 5500 volt rated one and don't run too much power. Vacuum variables really are the way to go with small loop antennas.
     
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  8. BenMara

    BenMara
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    Totally agree. i dont plan to run past 100w. 99.999% of the time on any Mag Loop
     
  9. BJ radionut

    BJ radionut
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    Those are "Air" variables
    These are Vacuum
    http://www.mgs4u.com/RF-Microwave/vacuum-variable-capacitors-500.htm

    https://www.rfparts.com/capacitors/capacitors-vacuumvari/vacummvariable-201to500pf.html

    http://www.ur4ll.net/MLA.jpg http://www.ur4ll.net/#caps3
    [​IMG]
    15-750pF 5KV 35A max dia. 108mm, max len. 200mm (incl shaft)
    (measured capacity is 10-780pF)
    All the Best
    Gary
     
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  10. BJ radionut

    BJ radionut
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    [​IMG]
    100 watt carrier rated mag loop
     
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  11. BenMara

    BenMara
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    If i like the 160/80 mag loop performance, Ill most likely build one for 40/20. Can never have too many antennas on the farm.
     
  12. BenMara

    BenMara
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    Do you have any online sources for MORE mag loop info? My ARRL antenna books is so limited for Mag Loop antenna...
     

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