Yeah, I did the math wrong by half. The physical dimension is correct, but you're right -- it's .137 wl. Thanks to everyone who provided info -- It seems as if there are some conflicting numbers in t
I'm working through the design issues that would be involved in converting an existing linear-loaded 2-element 40m beam (18-foot boom, 38-foot elements) to coil loading at the same place where the ex
I think this is overkill, particularly if he is using a galvanized or chrome-moly steel mast. Mine has been up since 1995 without a bearing, and shows no signs of any problems -- the fit through the
In fact, consider replacing the KT-34A with a C-3E or SteppIR, and making the KT-34 your second antenna. 73, Pete N4ZR The World HF Contest Station Database was updated 2 April 03. Are you current? w
On the other hand, in my experience, if the antenna is mounted right above the pointy-top, then it is very easy to work on while standing below the point where the section begins to narrow. The one r
Interesting issue -- not so much from the lightning standpoint as because grounding feedlines versus letting them float may affect how the connected antennas interact with one another. I think it was
Yuri, this is simply wrong. simple vector analysis will show you the vertical load guy wires apply to the tower as the lateral force increases. whether the tower can take it is a design decision made
I don't think it's possible to make such a blanket statement. The only right answer would be "it depends." The only thing you know for sure is that guying a self-supporting tower is putting forces on
You might want to take a look at K7NV's web site for his Yagistress software. Kurt has published a very interesting study there of guyed tower mechanics, using finite element analysis software to ass
Our local power company (Allegheny Power) installed them free and charges $3.95 a month, forever. If you use the whole system surge protector cascaded with approved outlet strip surge protectors for
I'm skeptical about applying the Polyphaser solution in most ham installations. Their approach is designed for situations where the site must be on 24/7 and recover quickly and gracefully from lightn
I think that a W7IN-style swinging gate located at one of the corners would work fine and provide close to 300 degrees of rotation if the horizontal arm is made long enough to reach beyond the tower
Do you know anything about the design? Rated load at what wind? Presuming it was up before, what load was on it and for how long? Worst wind speed encountered? It looks very nice, but intuitively, I'
DIN connectors are also a possibility in a non-exposed environment. To my surprise, they are rated for up to 4A at 100 volts, and can be had in up to 8 pins. I just bought a couple of sets to use wit
I have a Yaesu G-800SA rotator turning a small tribander on a swinging gate sidemount. The Yaesu has a locking rocker switch to control the direction of rotation. On more occasions than I care to rem
Just for the sake of discussion, why couldn't you just make up a little fixture that would hold the top end of a plumb bob contrivance, say 4 inches out from a tower leg and in plane with one side of
I'm sure these things vary a lot, but in this area at dawn most mornings it is dead calm. I have been up on my tower (only 97') under those conditions, and it's quite wonderful. I agree, though, that
What sort of tower, and how tall? What guy material? 73, Pete N4ZR The World HF Contest Station Database was updated 23 Feb 03. Are you current? www.pvrc.org/wcsd/wcsdsearch.htm
Recently, I set about replacing the feedlines on my K3LR-type 80m array. Each feeder in the original design is 87 feet of RG-8X. I ordered and received some heavy-duty "RG-8X type" coax and made up t
Yes, that's exactly why I said "apparent resonance." I have an MFJ259B, and have used it to check the VF. It comes in right at .72. The cable is made for the Wireman, and their other specs appear to