I just took a quick look at every message you have ever posted to Towertalk (using Netscape), and none of them appear as all on one line. I did notice that you had manually inserted carriage returns
Just to illustrate N4ZR's comment, I fired up HFTA and created a fictious terrain, one that a very good local terrain near the antenna, but had a lot of high stuff in the distance. If you used the we
If your purpose is to try and null out a specific signal, then rotating the loop may have some merit. If your purpose is to obtain better signal to noise ratio, then I think rotating the loop is wast
I would not recommend feeding an HF quad with vertical polarization. If you do that, the antenna pattern is no longer reinforced by ground reflections, and you end up with something that has less tha
OK, I'll concede one point. If your interested in local ground wave contacts, then the fact that you lose most of the antenna gain with a vertically polarized quad, probably doesn't matter. But I don
I just did a few quick simulations. It turns out that as height of the antenna increases, the gain difference between horizontal and vertical polarization decreases. Here are some results for a two e
I am sitting here looking at the pictures of this monster antenna, wondering how you would ever get something like this into the air. My hat's off to the guys who managed to put this up. Amazing feat
Frank Travanty, W9JCC, has written an Excel spreadsheet and an OR you can go to http://www.arrl.org/qexfiles/ and download the file labled TRANVITY.ZIP. Also download the following pdf file which giv
Yep, this will be heavy. The US Tower website shows the rebar cage for the HDX589 as using #9 rebar at the corners and not #13. You are apparantly overdesigning it for some reason. Even the HXD5106 u
Here are a few more pictures of this thing. In Japanese: http://www.netaro.net/~ja4xgc/75m/monster.htm Same thing in English, but you will have to paste this link back together in your browser. http:
"Work the world with your Gotham vertical. Amazing performance. Radials not required. V80 vertical $16.95. An appeal to intelligence. A product consistently advertised in QST month after month, year
I have a temporary low inverted vee for 160 meters. The apex is at 50 ft ant the ends are at 15 feet. It has a choke on the feedline. Yes, I know it's a lousy DX antenna. I also have an XM240, 2 elem
Aw shucks, there's no magic involved. I think I figured this out... Here goes my explanation: I have to make one assumption for this to work, and that is that noise arrives at the antenna from all an
A 55 ft tower with SteppIR on the top is a good size for an 80 meter vertical. This arrangement should be resonant somewhere around 2.9 MHz. In order to do a match with a single capacitor for the CW
If I was going to do this, I would do the following: 1. Route all cables either down the center of the tower, or taped to one leg. The cables should be routed such that they are always close to the t
Sounds overloaded to me, but you should do the calculations to be sure. I have an HDX555 with a 4 element SteppIR 2 ft up, and an XM240 9 feet above that, and a 20 ft mast. That's 16.4 sq ft (antenna
It sounds like you don't have a current mode balun, or maybe your balun isn't working properly. If it's a voltage mode balun, the feedline will act as part of the antenna and change the resonant freq
"Proximity to ground and other structures will detune your antenna - making a calculated length actually resonant at a higher frequency. ..." For antennas at heights between 1/4 wavelength and 1/2 wa
Wait a minute! You originally had a 281 ft OCF dipole that resonated at 2.1 MHz. You then shortened it by 10 ft and moved the resonance to 1.95 MHz? Kinda blew my mind there for a second. Assuming yo
"Jerry, It was originally 271' and had a SWR match of 1:1 at 2.1 MHz. I added 25' and that brought the 1:1 match down to 1.950 MHz...." That makes more sense. Originally you said you had 86 + 110 + 8