I strongly support the idea of a regular NVIS net. Maybe immediately after the club net each Thursday night on 75 meters. I would be happy to help with suggestions for antennas to meet various member'

Brian - I think all of the antennas were verified with excellent to usable SWR on 40, 20, 15 meters, but slightly over 2:1 on 10 meters. I wasn't directly present for the testing of the first one, but

Nice. Thanks for the update! - Jef

#antennas

Joshua— This is what I would recommend trying, quick and easy, and see how it works at 50ft up.

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Oh, and if you go with a ¼λ ground plane suspended a tall tree, you can bend the radials away from the monopole to about 30-45° beyond orthogonal to get the impedance up from 36Ω to about 50Ω. - Jef

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Joshua — A half-wave dipole suspended from a branch in a pine tree about 50 ft above ground level could work well. However… You would want to bring the center-fed feed line out perpendicular to the an

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Joshua -- You can certainly make a dipole using two half-wave elements instead of the usual two quarter-wave elements. Then the gain will be nearly 3dB greater. The problem would be how to feed it, be

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Forwarding this link (below) to a 20-minute video because NVIS, and because the presenter, Dr. Ben Witvliet, is probably the best researcher on NVIS that I know of. - Jef ---------- Forwarded message

Okay, I suppose you mean Sierra Hotel India Tango, but whatever... Congrats on the General. Now you can build some seriously big antennas. :-) - Jef

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10 tight winds around the boom, non-overlapping, should make a good choke for this band. - Jef

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Joshua - Very nice to see someone putting this kind of effort into antenna building (and experimenting.) You could probably make a neater, and somewhat more effective choke if you coiled the coax tigh

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Oh, and it's a good idea to form a choke at the feedpoint with several turns of coax tightly wrapped together around the boom, to reduce the inevitable common-mode current you'll get due to feeding a

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Greg - At work so gotta keep this brief. The hairpin, or beta match, has some advantages in this application—mainly that it is symmetrical so it doesn't distort the pattern as a gamma match would at t

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Here's a closeup of the hairpin match on the one I built:

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Joshua - Back in January 2015 we held an antenna-building party at my place and six of us built "tape measure" 3-element Yagis for 2 meters. Quick and easy to make, and the flexible elements fold up f

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Joshua - Nice work. Keep in mind that the length of the driven elements (plural) should each be a quarter wave at the geometric mean of the frequency range of interest. It's not the tip to tip length

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Doug - Nice work, and makes sense too! Thanks for sharing this. - Jef N5JEF

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On Tue, Oct 20, 2020 at 6:05 AM Jef - N5JEF via groups.io <jef@...> wrote: Here's a picture of my 10-ft diameter loop for 40-60-80 meters, a work in progress. Here's the flanges

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Here's a picture of my 10-ft diameter loop for 40-60-80 meters, a work in progress.

#antennas #elmer #howto

The small transmitting loop, often described misleadingly as the "magnetic loop" antenna, with a circumference under ⅓ wavelength (in some applications, under ⅒ wavelength) is a practical example of a

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