Steve, I used just this approach 25 years ago with a 3 element 20 meter monobander ten feet below the top of the tower. Unless you are using a very small antenna, you will need two short horizontal m
Hi Gord! Sorry for the delay, I just returned from a week in Australia and operating the phone Sweepstakes at KH7R! A Yagi structure doesn't have a "resonant frequency," but, of course, the design of
Hi Tom! Too bad u can't make it for CQ WW CW. Due to unexpected conflicts that occurred with several of our operators, we still need several experienced operators for next weekend. If anyone else wou
Dick, Any reputable dealer in specialty steels should provide a certification of strength free of charge, or for a minimal fee. I wouldn't trust the steel otherwise! 73 Frank W3LPL donovanf@sgate.com
Yes, W6AM's poles were "butt-spliced," a technique you can learn about in Edmund LaPort's classic "Radio Antenna Engineering" (pp 357-358). Many of the military and commercial Rhombic antenna farms o
Huh... Since when is an ungrounded 1/4 wavelength wire "resonant" ????? 73 Frank W3LPL donovanf@sgate.com -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.
Rick, A few ideas in response to your query... I do not use multiwire Beverages, but you will probably get additional comments on this topic. First, I don't think a metal fence will affect a Beverage
Ed, I think your confusion derives from the situation when the bottom of the 1/4 wave vertical is no longer connected to the transmission line and is instead open-circuited. Under this condition, the
Carl, Sorry I didn't more clearly describe how to isolate feedline shield currents from the Beverage feedpoint ground... Where do these underired feedline currents come from? The coaxial cable laying
Gary, For any type of new or used connector, it's hard to beat The RF Connection. They can even get rare, unusual or obsolete connectors custon made for you. The owner, Joel, can answer just about qu
Kirk, I recommend that you purchase "open pattern" heavy duty thimbles, the only type recommended -- and the only type sold -- by Rohn. I would not recommend modifying the critical structural compone
Bruce, Borrow or rent a transit, they do a great job in helping to level a tower. Set up the transit up in two locations, 90 degrees apart with respect to the tower base and at least as far away from
Roger, Because height above ground affects feedpoint impedance as well as providing -- ideally -- 6 dB of ground reflection gain, the actual gain of a horizontal half-wave dipole can be nearly one dB
Hi Chuck! The 6 dB gain from reflection from perfectly conducting soil is based on simple preservation of energy. Because of ground reflection, an isotropic antenna can only illuminate half of free s
Hello Brian! Thanks for the note! No, I have not personally checked Beverage sidelobe response with and without sloped terminations; however, as you know, both AO abd EZNEC show the improvement in mo
Bud, "Can you imagine a fisherman going out with only one bait?" Thats a great K4ISV quote! Good luck in CQ WW Bud! 73 Frank W3LPL donovanf@sgate.com -- FAQ on WWW: http://www.contesting.com/towertal
Larry, I simply can't put it any better than Bud, K4ISV's, recent e-mail: "Can you imagine a fisherman going out with only one bait?" At W3LPL we have M A N Y antennas and one of them will often give
Bill, Beverage antennas are very lossy and tightly coupled into the nearby Earth, as a result there is virtually no mutual impedance among even very close spaced Beverages. It's very simple to experi
Charles, Here are some direct answers to your questions: Based on computer models, and on-the-air experience, good choices are 580, 880 and 1160 feet. If these are inconvenient for you, use what you
Larry, Based on your description I suspect your 2 element beam is not working properly! Does it show decent f/b ratio? 73! Frank W3LPL donovanf@sgate.com -- FAQ on WWW: http://www.contesting.com/towe