A Force12 C3SS would outperform the G5RV without the loss of traps. Since 25' is nearly a half-wave on 20m you will be surprised how well a good tribander will do at that height. 73, Guy. I am curren
Part of the confusion here is that a made-to-order commercial radio room is usually going to be a single room inside a shelter, built on a concrete slab, and the problem is protecting everyone's stuf
For the boom, it would. But for the elements of something like a C31, which flexes a good bit, particularly the 20 meter elements, the computation would be unnecessarily harsh. The figures would come
You might think a little about it. If it affects one fifteen meter beam in-line, it will affect any because the secondary resonance effect is on the forty meter beam, not the 15 meter beam. Also plea
Not to say that people DON'T build their own, reread my post. I know someone who built an airplane. I also know someone who built several homemade, home-designed towers in excess of 100 feet. They BO
If the phase length of the free space horizontal offset (FSHO) is xdeg on 20 then it is 21/14 * xdeg (or 3/2 * xdeg ) on 15, and 28/14 * x (or 2 * xdeg) on 28. If the coax is .66 VF, then the length
On Mon, 01 Feb 1999 17:56:37 GMT, k2av@qsl.net (Guy Olinger, K2AV) wrote: Got a chance to look at the web page. No fair. His wife is KK7AA.... Guy L. Olinger k2av@qsl.net Apex, NC, USA -- FAQ on WWW:
This is a multi-part message in MIME format. --DA4729C62AB Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit -- Guy L. Olinger Apex, NC, USA k2av@qsl.net 'AV since '74, previ
The equivalence is easier to explain with the centers high. But... The ground reflection gain (or lack of it) normally quoted when analyzing this situation is only really in play to the specified db
Hills, particularly large buildings, sometimes above ground power/telephone/cable distribution (more an issue on 160 than 10, certainly). The closer the building, the smaller it can be and obstruct o
The coupling was from the radial field, which ran underneath the metal fence, not from the vertical conductor. The height of the vertical's feedpoint, given buried radials running under the fence, wo
Although I have seen big grips looped without anything, and no apparent ill effects, on the PLP web page they show a minimum radius they want. Even some thimbles would not do if you take their page s
Yup, fiberglass if you know to manage the sproing and have some way to deal with the minimum order business. Good stuff. What kind of commercial installations? AM radio stations stay away from dipole
That's right, in the C3x series the intermix is solved by the closed cell for the driver, and the presence of the 20 reflector is solved by having the 10 ref in front of the 20. In W7WHY's case, thou
Ken blends a number of things together in his post. Let's separate them out: Proportions are at issue. Most of the time I have seen a tribander and a two meter 10 element or some such up together, th
RF current causing TVI in tin roofs is particularly possible when the roof is used AS the current sink or is tightly coupled with high current radials immediately above it. The amount of current/volt
Not going in circles for me. Proof? It's not like this is an unvalidated/unmodeled antenna from a fly-by-night company, though we unfortunately do have some manufacturers of that ilk. For general pur
Read the description carefully. On the C39, the 40 DE is BETWEEN the 15 DE and the 15 reflector, NOT behind the 15 reflector. They HAVE had to deal with removing the 21 mhz resonance from the 40 "N"
Heck, no, I'm on your wavelength. Just forgot to acknowledge it. My reply was an augmentation, not a rebuttal. Agree completely, I have my own collection of stories that sound like yours. I asked him
Tom, W8JI, put this up in an email, simply reading part 97. Note the term "transmitter power". Power would be measured at the output of the final amplifying stage. A transceiver and an amp would be c