Author: Guy Olinger, K2AV" <k2av@qsl.net (Guy Olinger, K2AV)
Date: Tue, 15 Sep 1998 00:16:13 -0400
This is my favorite, first-up antenna: 140 feet of wire, from the ground up as high as can, (usually 50-65 feet & rest out as high as can get it. At the bottom fed with a "tank coil" network, or a 9:
Author: Guy Olinger, K2AV" <k2av@qsl.net (Guy Olinger, K2AV)
Date: Tue, 29 Sep 1998 00:49:15 -0400
world which Return Loss... Brings back memories of my time working Network TV for AT&T. A good thing that we don't have to worry about broadband ham signals requiring 30 db of return loss or better
Author: Guy Olinger, K2AV" <k2av@qsl.net (Guy Olinger, K2AV)
Date: Tue, 25 Aug 1998 21:15:25 -0400
Doesn't Polyphaser recommend tying the tower, the rebar, and the ground busses all together *before* the concrete is poured, emphasizing shortest, straightest path from the tower to the ground field
I'm really not sure why you are having this problem. I would concede that for frequencies where 3 element yagis are common, gain effects will be foreground. Front to back is another matter if it's an
Hi, Does anyone have a source of 75 ohm twinlead, in the USA or overseas. Seems to be much rarer these days. It's just the bill for a colinear matching problem. TIA & 73, Guy K2AV
Would note here that Chuck was measuring current key down, which is a different measurement than what ON4UN was making. Even if Chuck's central piece of coax was isolated by 100 db from the coax eith
Hi, Gene. Thanks for the URL. Got out the data for my Trylon and antennas and put stuff in, including the mast. Got basically the same overall figures as by other means. It was interesting to note th
In normal dirt, there's no point to using plywood aside from making the *TOP* neat to see. Underground, concrete on undisturbed earth is best. Some soils are so crumbly that the hole won't keep its s
You are into some interesting stuff. Can of worms... 1) 60 is more the point of diminishing returns for 1/4 wavelength radials. Depending on your ground, 13 radials can be anywhere from just so-so to
I would estimate that the principal loss is in the maximum f/b possible on a given band. However, in a fixed yagi the maximum f/b only occurs at a given frequency and drops off either side. Meaning t
Best kept secret around, but since modeling can be a pain on certain days, noone wants to do ALL the math before bolting in the stacks. Modeling all the stuff around, including booms and guy wires an
The shield has to be modeled as a wire in it's own right. It's in the other element's fields. If you break the shield connection at the relays then it's short, nonresonant and of small effect. Otherw
Interesting general Query...thought I'd forward it along. Please post to other channels. Keep M3MPH on the reply list. out mystery British still abbreviation? pilots,
Seems to be an awful lot of air time trying to kill fleas on the elephant. An earlier post is correct that the tower flexibility necessary to engage guy wires is quite missing on self supporting towe
Amen. Without getting your station in the middle of the connection. And if not, all the miscellaneous house wiring and coax will be participating in equalizing local ground charge during a close stri
This mount is made to mount parabolas and the like. A swinging gate would not have but a few degrees more than 180 movement about the axis. OK if that is what you need. 73, Guy To: <towertalk@contest
NO, NO, NO... The channel then would be no stronger than the pipe, and maybe not even that. And you would have set a pre-stressed bend giving a collapse the place to start where you drew the metal in
Over-noaloxing anything will cause troubles. Noalox is NOT a preferred conduction path. If you overdo it, it will harden into a resistive strata and cause trouble down the line. Noalox is supposed to