A high current point is exactly where one needs to feed the antenna. You probably brought a high voltage point into the shack and it arced - hard to match and dangerous. -- 73, Cecil, w5dxp.com ____
One can add 30m, 20m, 17m, 15m, 12m, and 10m to a 40m rotatable dipole simply by feeding it with ladder-line. Here's an article on the subject: http://www.w5dxp.com/rotdip.htm -- 73, Cecil, w5dxp.co
Point is, you don't have to do that with an SG-230. -- 73, Cecil, w5dxp.com _________________________________________________________________ Search for grocery stores. Find gratitude. Turn a simple
A standard G5RV is a pretty good antenna for 80m, 40m, 20m, and 12m. -- 73, Cecil, w5dxp.com _________________________________________________________________ Laugh, share and connect with Windows L
I prefer to do as little work as possible. Put up any length of dipole (at least 3/8WL long at the lowest operating frequency) and feed it with ladder-line. Sit in the warmth of the shack and adjust
Re-radiated localized near-field noise from a resonant antenna system can affect the far-field S/N ratio in a nearby antenna. From end-to-end, two opposing elevated radials are 1/2WL and thus parasi
From: "k6xyz" <k6xyz@sbcglobal.net> Subject: RE: [TowerTalk] dipole length adjustment The link dosent work It's because www.qsl.net is down. I'm in the process of moving all my information from theww
Subject: Re: [TowerTalk] dipole length adjustment I earlier posted a URL that depended upon www.qsl.net being up which it wasn't. I have transferred all those files to another server so the informati
Sorry, I didn't write that but it is true anyway. If one wants to run 1500 watts with no antenna tuner, one can do it the way I did it. I developed my matching method because I didn't want to spring
QSL.NET had a web page saying they were replacing their server but it crashed. :-( I moved all my stuff over to 1and1.com -- 73, Cecil, w5dxp.com _____________________________________________________
Hi Bob, I have some and used it for awhile but I felt a lot better using RG-400 which has a diameter of 0.195". All my baluns and short lengths of coax cable are made from RG-400 now. I didn't have
OTOH, in my situation, they are always matched and see something close to 450 ohms. I put the tuner at the antenna. I wouldn't recommend running 350 meters of OWL in a mismatched condition due to the
From: "Allan H. Kaplan" <w1ael@arrl.net> Subject: [TowerTalk] Subject: Re: Managing Balanced line transitions Let me explain that my advice against using baluns in connection with open-wire line was
Hmmmm, the misconception seems to be mostly yours. The differential transmission line current fields *cancel* in the core so, technically, they don't go "through the core". If the currents are perfe
From: "Cecil Moore" <w5dxp@hotmail.com> Subject: Re: [TowerTalk] Subject: Re: Managing Balanced line transitions through the core". Consider two wires passing through a ferrite core. If they carry id
It is an intriguing idea for a top-loaded mobile antenna. One of the problems with pure top loading is to keep the field of the coil from encountering the top hat. A T-500-2 core would pretty much c
Assuming 1500 watts and a feedpoint impedance of 35 ohms, the feedpoint current is ~6.5 amps. When that current divides among 100 paralleled radials, each radial carries ~65 mA, no big deal for #24.
In general, the optimum ladder-line length results in an SWR current maximum point existing somewhere around the point where the ladderline interfaces with the balun. That's a low, near-resonant imp
Every loading coil has a self-resonant frequency somewhere above the frequency it is used on for mobile operation. It occurs at the frequency where the distributed capacitive reactance is equal to t