Two (be prepared to spend money) are: Surplus sales http://www.surplussales.com/Antennas/TransVarInductor.html and Cardwell Condenser http://www.cardwellcondenser.com/PAGES/md.html Something from one
You want a pair of the Johnson 229-203 rollers. If you search the Net they show up pretty regularly. Also, posted Wanted's on all of the E-mail and Web swap lists and sites and someone should have th
you want to save If someone really wants to save money, they should just build a T network tuner and use a good 1:1 current or choke balun on the tuner output. There is little reason to do anything
My friend W0ZNL (Jim) has two matched roller inductors and the needed capacitor plus the gears and belts to make just what you want..He lives near Wichita Kansas and his phone number is: 316-744-0772
Tom, I've read your comments & analysis of "T" tuners before with interest but what's your opinion on the "L" - double balanced" tuner concept with variable inductors in each leg (used with open wire
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 19 Oct 2005 12:45:17 +0200 (CEST)
One problem with the L network (single ended or balanced) is that working Q is a function of impedance transformation ratio. Q = ([Rp/ Rs] 1) Every time you double the working Q, you increase the los
Hi Patrick, First, this entire balun and tuner thing has gotten way out in fantasy land because people started assuming things without doing a paper analysis or measurements. QST even keeps repeating
I must respectfully disagree with Tom Rauch about the concept of a balun on the output side of a tuner vs the input side. I currently have 4 tuners that I have basically fried due to legal limit powe
Moving the balun to the input does not affect core loss or balance. It does however change the operating conditions for *differential* mode current. If the balun is made of 50 ohm coax + ferrite, th
What you say, Chuck, is true for so-called "voltage baluns". I have fried at least one myself (Ten-Tec 4229 tuner). If, however, you use a current balun, then it shouldn't matter much if you place it
The arguments about input vs. output baluns used with antenna tuners makes one wonder if a balun on both would be advisable? 73, Gerald K5GW In a message dated 10/19/2005 3:42:50 P.M. Central Dayligh
concept of a balun on have 4 tuners that mismatches on 450 ohm and got hot, but at switches or Hi Chuck, Heating is almost never due to saturation. That's another myth that is repeated over and over