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Build a Magnetic Loop?

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

  1. BenMara

    BenMara 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 Master of puppets

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

    2RT307 Sr. Member

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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 W9WDX Amateur Radio Club Member

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

    BJ radionut Supporting Member and 6m addict

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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 W9WDX Amateur Radio Club Member

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  7. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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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 W9WDX Amateur Radio Club Member

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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 Supporting Member and 6m addict

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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
     
  10. BJ radionut

    BJ radionut Supporting Member and 6m addict

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

    BenMara W9WDX Amateur Radio Club Member

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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 W9WDX Amateur Radio Club Member

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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...
     
  13. MicroWave

    MicroWave Survivalist

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    Building a loop antenna yourself is always an option, but with most commercial antennas there is always something that doesn't fit exactly. Either they are too narrow, or they don't exactly cover the frequency ranges that you need, or there is no cable remote control, or there is a cable remote control, but the antenna is the ultimate junk, or they are not suitable for higher output power etc. It's really frustrating sometimes! (n)
     
  14. BJ radionut

    BJ radionut Supporting Member and 6m addict

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  15. jon666

    jon666 Sr. Member

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    i have a mfj mag loop antenna. works great i got it on a rotor to turn to catch dx. of course it is not cheap around 500 bucks
     

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