Tom Rauch wrote........ Message: 1 Date: Tue, 27 Sep 2005 11:11:36 -0400 From: "Tom Rauch" <w8ji@contesting.com> Subject: Re: [TowerTalk] Top hat on mobile usefull? To: <towertalk@contesting.com> Mes
Gary, Thanks for the clarification. I forgot that when the energy becomes a detached EM wave, that that magnetic and electric fields become "mutually causal". So given that, then, is a few more feet
Tom Rauch wrote.... Tom, Yes, the capacity hat was connected to the top of the coil with a wire. The extra delrin rod was merely to put some distance between the coil and the capacity hat in order to
(...) (...) Dave, One comment on your ground rods. Everything I have read says that adjacent ground rods should be no closer than the sum of their lengths. For example, your two adjacent 8' ground r
Jan, Its real like Cold Fusion and Intelligent Design is real. Only in Area 51. But it sure is fun to have it around. Dudley - WA1X _______________________________________________ See: http://www.ms
Bill, I offer my apologies, but I meant nothing theological in my comment. The three ideas mentioned have been offered by their proponents as scientific hypotheses with one or more very unconvention
(...) Bill, Thanks for your kind response. Yes, it's the fringe science of antennas that interests me. There is enough controversy in that other area that we certainly don't need to bring in somethi
Tom wrote... Tom, Yes, these fringe ideas stick around because the theory always looks reasonable, except for an innocuous looking but terribly fatal flaw. In this case: "...the beads affect both the
Jim, Radials for lightning protection have different criteria than radials for rf. So it's best to consider them separately. The reason why AM BC stations can combine the functions is because they h
Gary, I am now officially confused. Suppose I built a vertical and ran 40 0.2 wavelength rf radials of insulated #14 wire along the top of the ground. Suppose I had a single ground rod near to and c
(...) Mark, Actually, I was aware of those distinctions in the roles of grounds and counterpoises. However, your short treatise was extremely well written and concise. We all should print it out and
Gary, It is a lot of work to accurately set up a model for a given multiband yagi. However, hams do it all the time out of a labor of love for their own antennas. I am guessing that people have alre
Jim, The center of a dipole is quite insensitive to proximity to metal. You could secure the center insulator directly to the metal mast, if you have no other choice. Since your antenna might not be
Bob, The answer to your V question depends on what kind of operating you do on 80m. The height of the center of the antenna is the most important concern. With the center currently at 25 feet, I ima
Message: 1 Date: Sun, 19 Mar 2006 11:29:21 EST From: NPAlex@aol.com Subject: [TowerTalk] Build your own Square Needle To: towertalk@contesting.com, mjweaver@fmtcs.com Message-ID: <2c8.5ab92a2.314ee0e
Gary, You are probably already aware of this but I will offer it anyway just in case. There is a rule of thumb about the minimum distance between ground rods. It has to do with the fact that spacing
I second the notion that a non-resonant metal roof that is off the ground might be a liability rather than an asset for a quarter wave vertical. The metal roof would be modeled as a large number of n