After nearly 67 years of being a ham, I finally got on 6 meters.

Discussion in 'VHF/UHF - 50Mhz and Beyond' started by W9JEF, Jun 15, 2021.

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  1. K1JNT

    K1JNT Ham Member QRZ Page

    A bi-square cut for 6m also works fairly well...112" 14ga Flexweave per side...54 1/4" ladder line matching stub (derived by dip meter) and 1:1 balun. A little better than the rectangular loop I had been using.
     
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  2. W9JEF

    W9JEF Platinum Subscriber Platinum Subscriber QRZ Page

    The illustration is unclear as to which lines are conductors v. insulators. Is there a better drawing somewhere?
    [​IMG]
    73,
    Jim
    EARTH: LOVE IT OR LEAVE IT
     
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  3. KI4POT

    KI4POT Ham Member QRZ Page

    Got an email from my buddy who worked the VHF contest and SOTA activations with me this weekend. One of his 6m contacts, using my homebrew 6m EFHW hung vertically and connected to his 5w FT-818 was 750 miles away! QRP and cross-polarization losses, yet he still did it. :)

    Chris
     
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  4. K3EO

    K3EO Ham Member QRZ Page

    All bold lines labeled with small letters "l" of which there are three and capital letters "L" of which there are four are conductors. The ropes, Halyard and guy lines are non-conductive.

    Due to its size on 6 meters, the wires are not self supporting so you may have to build a frame using wood or PVC or whatever is non-conductive.

    See link - https://sites.google.com/site/wvfisher/hdoublebayphotos
     
    Last edited: Jun 18, 2021
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  5. W9JEF

    W9JEF Platinum Subscriber Platinum Subscriber QRZ Page

    [​IMG][​IMG]
    If solid lines are conductors, the image on the left, where the coax connects, has a direct short. The one on the right is more clear. Its polarization looks to be mostly vertical.

    73,
    Jim
    EARTH: LOVE IT OR LEAVE IT
     
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  6. N3DT

    N3DT Ham Member QRZ Page

    Best way to build the HDB I've found is to cut the perimeter as one piece and attach the center wire with tiny SS rope clamps or similar. Resonance is easily achieved with shortening or lengthening the perimeter at the bottom feed point, and the 50Ω SWR can be exactly achieved by moving the center wire up or down. All of mine are below 1.1:1 (FT8 freqs) and I've got them from 17-6M. I interlace them at 90° so I can get 2 antennas on one support. You only need a quarter turn to cover the whole 360°. PVC works good as spreaders for the horizontal wires.

    I compared my 15M one to a Moxon I built and it was no different, the H was bidirectional however. And yes they are horizontally polarized, not that it matters. My 17M one is only 12' or so off the ground at the bottom, but works as good as my 70' dipole, sometimes one is better than the other, it just depends on propagation.
     
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  7. WA3GWK

    WA3GWK XML Subscriber QRZ Page

    It does matter for tropospheric propagation on 6 meters, not so much for ionospheric like sporadic E
     
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  8. W9JEF

    W9JEF Platinum Subscriber Platinum Subscriber QRZ Page

    Considerable FD activity on 6 meters today. On CW, still with my simple vertical, worked 2 in Kentucky, and 2 in my home state of Wisconsin.


    73,
    Jim
    EARTH: LOVE IT OR LEAVE IT
     
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  9. W0IS

    W0IS Ham Member QRZ Page

    And don't forget the one in Minnesota, namely, me! I thought that call sounded familiar. I was running 5 watts, with my FT-817, to my HF fan dipoles. I suspect most of the signal is coming out of the 40 meter element, which is approximately 7/2 wavelength on 6. It goes to show you don't need much of an antenna when the band is open.
     
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  10. W9JEF

    W9JEF Platinum Subscriber Platinum Subscriber QRZ Page

    Hey... now that you mention it, your call did elicit an intimation of familiarity. I'm still using (as seen in the OP) that quarter-wave vertical. And--as were most of my contacts--I was Class 1D.

    Kudos to you--for using emergency power. I had thought about operating the 7300 from out in the car, but the rain put a damper (pun intended) on that.

    73,
    Jim
    EARTH: LOVE IT OR LEAVE IT
     
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