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1. Topband: W8ji ATR-10 design 160M? (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Sat, 5 Oct 2013 13:54:21 -0500; My antenna is a 99 foot inverted L for 160M with 95 short radials 2000 feet of wire. What I am trying now is W8JI suggested modification design to improve the ATR-10 design by taps on the coil for ad; /archives//html/Topband/2013-10/msg00044.html (7,891 bytes)
2. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Tue, 8 Oct 2013 12:56:50 -0500; Tom W8JI made some measurements back in 1997 on the ATR-15 when it first came out. Not sure how this will print out. * * *The ATR-15 measures as follows for load R and loss on 1.8 MHz: 12.5 ohms 21.8; /archives//html/Topband/2013-10/msg00065.html (11,679 bytes)
3. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Tue, 8 Oct 2013 13:28:57 -0500; Sorry I need to add some thing I left out. The ATR-10 modification I am using is without the series capacitor sorta speak. The MFJ 989B is fed into a tap on the coil. Cause of the T network on the tu; /archives//html/Topband/2013-10/msg00066.html (13,030 bytes)
4. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "N4XM Paul D. Schrader" <n4xm@iglou.com>; Date: Wed, 16 Oct 2013 11:01:14 -0400; Jim, I did not make the comments you said I made below. And the XMATCH Antenna Tuner is NOT a "T" match. It is a patented circuit. This unique circuit is a United States Patent. And see http://n4xm.m; /archives//html/Topband/2013-10/msg00098.html (13,295 bytes)
5. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Wed, 16 Oct 2013 11:09:14 -0400; And for more info, send him $3. 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com. For spots, please go to your favorite ARC V6 or VE7; /archives//html/Topband/2013-10/msg00099.html (13,010 bytes)
6. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 16 Oct 2013 12:00:54 -0400; Respectfully, the X match is nothing but a common T-match with a fixed capacitor in one leg. In a normal T-match, operating Q can be varied over a wide range by adjusting L/C ratios. By restricting r; /archives//html/Topband/2013-10/msg00100.html (10,515 bytes)
7. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Wed, 16 Oct 2013 11:42:54 -0600; As Tom notes, the widest possible matching range for a T-Network is with two adjustable capacitors (and, presumably, a variable inductor, typically a roller inductor). Constraining any one of these p; /archives//html/Topband/2013-10/msg00101.html (13,491 bytes)
8. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 16 Oct 2013 14:42:06 -0400; As Tom notes, the widest possible matching range for a T-Network is with two adjustable capacitors (and, presumably, a variable inductor, typically a roller inductor). Constraining any one of these p; /archives//html/Topband/2013-10/msg00102.html (12,156 bytes)
9. Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 08:31:23 -0400; *L network tuners (like the Ten-Tec, Nye Viking, etc) handle more* *power into impedances near 50 ohms, but often do a poor job * *matching reactive or very low impedance loads on low frequencies. Th; /archives//html/Topband/2013-10/msg00103.html (12,277 bytes)
10. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Thu, 17 Oct 2013 09:04:08 -0500; Hi Paul http://lists.contesting.com/_topband/1997-01/msg00037.html You posted the comment from W8JI on a reply sorry about that. . No biggie. What the patent number? I would like to read more about i; /archives//html/Topband/2013-10/msg00104.html (8,908 bytes)
11. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 17 Oct 2013 10:25:09 -0400; Besides all of the focus on loss, one has to consider component values, expense, dissipation at different inductance values, connection losses, and matching range of the tuner. The L in this example; /archives//html/Topband/2013-10/msg00105.html (14,695 bytes)
12. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 11:05:51 -0400; The advice I would give anyone is pretty simple. Don't design or use an antenna that has extremely low or reactive feed impedances, unless you have no other choice. If you must use one, plan on low e; /archives//html/Topband/2013-10/msg00106.html (11,130 bytes)
13. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 11:18:02 -0400; So what different bout your tuner, is it like the ATR-10 design? Nothing special. It's just a symmetrical balanced tuner with a pair of synchronized roller inductors and a large vacuum variable cap (; /archives//html/Topband/2013-10/msg00107.html (9,908 bytes)
14. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Shoppa, Tim" <tshoppa@wmata.com>; Date: Thu, 17 Oct 2013 15:37:09 +0000; Very interesting! I remember seeing transposition blocks at hamfests when I was a kid but I didn't know what they were at the time. Looking up some old patents, e.g. http://www.google.com/patents/US2; /archives//html/Topband/2013-10/msg00108.html (10,991 bytes)
15. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: Kenneth Grimm <grimm@sbc.edu>; Date: Thu, 17 Oct 2013 11:51:32 -0400; The PalStar AT5K has withstood all the abuse that I've been able to muster on 160 mx. 73, -- Ken - K4XL BoatAnchor Manual Archive BAMA - http://bama.edebris.com "Show me a politician who is poor, and; /archives//html/Topband/2013-10/msg00109.html (9,155 bytes)
16. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: donovanf@starpower.net; Date: Thu, 17 Oct 2013 12:15:27 -0400 (EDT); Hi Tim, This is the patent for the classic Edgar F. Johnson (E.F. Johnson) transposition insulator: http://reference.insulators.info/patents/patents/pdf/4/us002043754-001.pdf http://www.google.com/pa; /archives//html/Topband/2013-10/msg00110.html (11,803 bytes)
17. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "N4XM Paul D. Schrader" <n4xm@iglou.com>; Date: Thu, 17 Oct 2013 12:21:37 -0400; See http://n4xm.myiglou.com--click on the blue ribbon for sure. I am a licensed professional electrical engineer and have a US Patent for my unique tuner. I have been an active ham for decades. Beliv; /archives//html/Topband/2013-10/msg00111.html (16,508 bytes)
18. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>; Date: Thu, 17 Oct 2013 12:24:22 -0400; Thanks for sharing the patent info, Frank! Really interesting! 73, Charlie, K4OTV --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of donovanf@starpower.net Sent:; /archives//html/Topband/2013-10/msg00112.html (12,452 bytes)
19. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Thu, 17 Oct 2013 10:34:47 -0600; Paul, there are many people on this list who have comparable professional and ham credentials to yours. Nobody means any offense or wants to start an argument, but rather just want to understand how; /archives//html/Topband/2013-10/msg00113.html (17,568 bytes)
20. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 17 Oct 2013 13:45:00 -0400; wants to start an argument, but rather just want to understand how your invention differs from an ordinary T network with a fixed capacitor. I and I'm sure many others would merely like you to explai; /archives//html/Topband/2013-10/msg00114.html (10,148 bytes)

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