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Total 18 documents matching your query.

1. [TowerTalk] RG11 cable (score: 1): Author: Bill Ogden <ogden@us.ibm.com>; Date: Thu, 2 Dec 2004 13:07:21 -0500; I have about 300' of RG-11 you can have if you can pick it up. It is in 100' lengths. The label says "RG11U Comm/Scope AMW style 1478" and the cable is light tan colored. It is about 13 years old, bu; /archives//html/Towertalk/2004-12/msg00019.html (7,377 bytes)
2. [TowerTalk] RG11 cable (score: 1): Author: Bill Ogden <wogden@attglobal.net>; Date: Thu, 02 Dec 2004 13:46:43 -0500; I have about 300' of RG-11 you can have if you can pick it up. It is in 100' lengths. The label says "RG11U Comm/Scope AMW style 1478"and the cable is light tan colored. It is about 13 years old, but; /archives//html/Towertalk/2004-12/msg00045.html (7,429 bytes)
3. [TowerTalk] RG11 Cable (score: 1): Author: "Carol Richards" <n2mm@comcast.net>; Date: Tue, 25 Aug 2009 14:16:06 -0400; After searching for many years for a source of CATV cable, the Gods must have been shining on me today. The local cable company had run a 300ft piece of line temporarily until they founf the problem.; /archives//html/Towertalk/2009-08/msg00495.html (7,679 bytes)
4. Re: [TowerTalk] RG11 Cable (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 25 Aug 2009 11:36:21 -0700; must have been shining on me today. The local cable company had run a 300ft piece of line temporarily until they founf the problem. I asked for the cable and not only did they give it to me, but prom; /archives//html/Towertalk/2009-08/msg00498.html (8,252 bytes)
5. Re: [TowerTalk] RG11 Cable (score: 1): Author: Tom Haavisto <kamham69@gmail.com>; Date: Tue, 25 Aug 2009 14:59:27 -0400; http://www.k1ttt.net/technote/matching.html Shows how to match 50 to 75 ohm cable Tom - VE3CX _______________________________________________ _______________________________________________ TowerTalk; /archives//html/Towertalk/2009-08/msg00500.html (8,883 bytes)
6. Re: [TowerTalk] RG11 Cable (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 25 Aug 2009 12:07:06 -0700; Not only is this complicated and frequency sensitive (it only covers a single band), it is un-necessary. 73, Jim K9YC _______________________________________________ _________________________________; /archives//html/Towertalk/2009-08/msg00501.html (7,645 bytes)
7. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 15:35:48 -0400; Whether it's complicated and un-necessary is really a matter of opinion. Granted, the mismatch loss is insignificant, and if you have an autotuner or manually tuned amp that you use all the time any; /archives//html/Towertalk/2009-08/msg00503.html (9,226 bytes)
8. Re: [TowerTalk] RG11 Cable (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 25 Aug 2009 13:39:15 -0700; By what math? A 50 ohm (purely resistive) antenna is a 1.5:1 mismatch to 75 ohm coax (and an antenna that is 50 ohms but not resistive would be a mismatch to 50 ohm line). The SWR falls along the len; /archives//html/Towertalk/2009-08/msg00504.html (9,958 bytes)
9. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 16:49:40 -0400; The 1.5:1 SWR circle for lossless 75 ohm line intersects the real axis at 50 ohms and 112.5 ohms resistive. 112.5 ohms resistive is 2.25:1 50 ohm SWR when you transition back to a 50 ohm system ____; /archives//html/Towertalk/2009-08/msg00505.html (8,150 bytes)
10. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 16:56:31 -0400; What I meant was the mismatch WITH a 75 ohm line, not "on" The 75 ohm line can transform a 50 ohm load up to as bad as a 2.25:1 mismatch w.r.t. 50 ohms. ______________________________________________; /archives//html/Towertalk/2009-08/msg00506.html (7,590 bytes)
11. Re: [TowerTalk] RG11 Cable (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Tue, 25 Aug 2009 23:10:55 +0200; But only if the line length is a quarter wave electrically or an odd multiple 73 Peter The 1.5:1 SWR circle for lossless 75 ohm line intersects the real axis at 50 ohms and 112.5 ohms resistive. 112.; /archives//html/Towertalk/2009-08/msg00507.html (9,137 bytes)
12. Re: [TowerTalk] RG11 Cable (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 25 Aug 2009 14:11:38 -0700; OK, I understand your logic. But that's a worst case (lossless line, precise odd number of quarter wave lengths) mismatch to a 50 ohm transmitter, NOT a standing wave ratio on the line. Any reasonabl; /archives//html/Towertalk/2009-08/msg00508.html (8,939 bytes)
13. Re: [TowerTalk] RG11 Cable (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Tue, 25 Aug 2009 17:15:45 -0400; For about 12 years I used CATV hardline, cut to a multiple of a half wave at 1750 KHz, measured at 28 MHz. It worked beautifully. 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http:; /archives//html/Towertalk/2009-08/msg00509.html (9,372 bytes)
14. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 17:34:04 -0400; Yeah, but 1/2 inch hardline might as well be lossless, and if the load is 40 ohms or 36 ohms instead (no problem on a 50 ohm system), then the range of unacceptable matches from the transformation e; /archives//html/Towertalk/2009-08/msg00510.html (9,431 bytes)
15. Re: [TowerTalk] RG11 Cable (score: 1): Author: "K1TTT" <K1TTT@ARRL.NET>; Date: Tue, 25 Aug 2009 23:06:39 +0000; I hate to say this since it is my web site, but I agree. Unless you are doing something very critical at vhf/uhf don't bother trying to match 50 and 75 ohm cable impedances. David Robbins K1TTT e-mai; /archives//html/Towertalk/2009-08/msg00516.html (9,560 bytes)
16. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 19:27:20 -0400; Yeah, for the "worst case" 2.25:1 SWR with an actual ohm load. But it's a warning about the casual use of 75 ohm cable in 50 ohm systems based on an experience I had when I didn't even know the cable; /archives//html/Towertalk/2009-08/msg00519.html (11,031 bytes)
17. Re: [TowerTalk] RG11 Cable (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 25 Aug 2009 19:28:06 -0400; " I didn't even know the cable I had was 50 ohms wasn't 50 ohms... .oops _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTa; /archives//html/Towertalk/2009-08/msg00520.html (8,583 bytes)
18. Re: [TowerTalk] RG11 Cable (score: 1): Author: "Stan Stockton" <stan@aqity.com>; Date: Tue, 25 Aug 2009 18:55:47 -0500; I am still using 3/4" 75 ohm hardline for the majority of my antennas. If it is a 50 ohm antenna and convenient I will make the hardline a multiple of a half wavelength. Many of the antennas are desi; /archives//html/Towertalk/2009-08/msg00527.html (9,013 bytes)

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