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Total 153 documents matching your query.

121. [TowerTalk] Coax (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 9 Apr 2012 06:04:21 -0700; RG213 is not a spec, it's a very broad generic description. There are RG213s built with thin copper braid and others with heavy copper braid. The loss in cable is a direct function of how much copper; /archives//html/Towertalk/2012-04/msg00125.html (11,691 bytes)
122. Re: [TowerTalk] Coax (score: 1): Author: TexasRF@aol.com; Date: Mon, 9 Apr 2012 09:22:14 -0400 (EDT); Jim, the example compares 200ft of LMR400 to RG213. The stated difference is .358 dB/100ft for a total of .716 dB. That is a power ratio of 1.179 or 100w vs 117.9w. That is easily measured with a bir; /archives//html/Towertalk/2012-04/msg00126.html (12,070 bytes)
123. Re: [TowerTalk] Coax (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 09 Apr 2012 06:28:24 -0700; And at that level, small differences in match will affect not only the power actually delivered, but also (probably to a greater effect) the readings on the meter. I'd also be interested how they got; /archives//html/Towertalk/2012-04/msg00127.html (10,647 bytes)
124. Re: [TowerTalk] Coax (score: 1): Author: Steve Maki <lists@oakcom.org>; Date: Mon, 09 Apr 2012 09:30:47 -0400; At low frequencies, dielectric loss is very low, gradually rising with increasing frequency. At some frequency dielectric loss takes over, but that frequency is way above HF. At HF it's all about DC; /archives//html/Towertalk/2012-04/msg00128.html (8,463 bytes)
125. Re: [TowerTalk] Coax (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 09 Apr 2012 06:42:34 -0700; The dominant reason loss goes up with frequency at HF is that the skin depth is getting thinner (hence the sqrt(f) term in the loss equation). Most of those equations and formulas have two terms a k1; /archives//html/Towertalk/2012-04/msg00129.html (9,358 bytes)
126. Re: [TowerTalk] Coax (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 9 Apr 2012 07:28:14 -0700; Jim, the example compares 200ft of LMR400 to RG213. The stated difference is .358 dB/100ft for a total of .716 dB. That is a power ratio of 1.179 or 100w vs 117.9w. That is easily measured with a bir; /archives//html/Towertalk/2012-04/msg00130.html (12,782 bytes)
127. Re: [TowerTalk] Coax (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 09 Apr 2012 08:01:44 -0700; More like 115 or 120W vs 100W .. 5% accuracy is probably more realistic. As an example, the Telepost LP100 manual (which I happen to have here) says 5% worst case absolute, 3% typical, but doesn't sa; /archives//html/Towertalk/2012-04/msg00133.html (11,917 bytes)
128. Re: [TowerTalk] Coax (score: 1): Author: K8RI <K8RI-on-TowerTalk@tm.net>; Date: Mon, 09 Apr 2012 12:16:43 -0400; It is more economical, but not that much. On a per foot basis, Davis 213 is 78 cents while I can find LMR-400 at 89 cents, or about 14% more. Of course in 500 and 1000 foot spools they are both, nota; /archives//html/Towertalk/2012-04/msg00136.html (12,868 bytes)
129. Re: [TowerTalk] Coax (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 09 Apr 2012 09:28:30 -0700; Having recently installed 1000 feet of 9913-F7 and 1500 feet of Bury-Flex I thought I pass along some observations: The 9913-F7 braid "prints" on the outside of the cover, which I think makes it more; /archives//html/Towertalk/2012-04/msg00137.html (13,944 bytes)
130. Re: [TowerTalk] Coax (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 09 Apr 2012 09:37:52 -0700; Agreed on all counts. Another of those complicating factors is the fact that the Zo of a transmission line is NOT a pure resistance, nor is it constant with frequency. Zo starts out highly reactive a; /archives//html/Towertalk/2012-04/msg00138.html (9,760 bytes)
131. Re: [TowerTalk] Coax (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 09 Apr 2012 16:15:22 -0400; This assumes that the two meters are identical, calibrated identically and with identical deviations with frequency. At the very least, I would take measurements "both ways" - once with meter 1 on t; /archives//html/Towertalk/2012-04/msg00140.html (15,350 bytes)
132. Re: [TowerTalk] Coax (score: 1): Author: "Larry Burke" <wi5a@sbcglobal.net>; Date: Mon, 9 Apr 2012 18:46:53 -0500; Roger, K8RI, wrote.... section to find water damage and it didn't get in at the connectors either. We cut open one piece and found about 5 or 6 feet mostly white powder in the middle. Is anyone else; /archives//html/Towertalk/2012-04/msg00142.html (9,395 bytes)
133. Re: [TowerTalk] Coax (score: 1): Author: K8RI <K8RI-on-TowerTalk@tm.net>; Date: Mon, 09 Apr 2012 20:56:22 -0400; If it's protected I'd guess it'd do quite well, but that is a guess. As a preference though, I'd pick the Davis BuryFlex and no, I have no connection with the company, but have found them to be very; /archives//html/Towertalk/2012-04/msg00143.html (10,277 bytes)
134. Re: [TowerTalk] Coax (score: 1): Author: <john@kk9a.com>; Date: Mon, 09 Apr 2012 18:55:19 -0800; It would be interesting to see actual loss of Belden 8267 RG-213. I only use it for jumpers and rotator loops and I use Heliax for long runs. Johh KK9A RG213 is not a spec, it's a very broad generic; /archives//html/Towertalk/2012-04/msg00145.html (8,842 bytes)
135. [TowerTalk] Coax (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 16 Apr 2012 03:18:26 -0700; More like 115 or 120W vs 100W .. 5% accuracy is probably more realistic. As an example, the Telepost LP100 manual (which I happen to have here) says 5% worst case absolute, 3% typical, but doesn't sa; /archives//html/Towertalk/2012-04/msg00281.html (11,162 bytes)
136. [TowerTalk] Coax (score: 1): Author: Phil Snyder <n9lah@comcast.net>; Date: Sat, 23 Feb 2013 10:13:10 -0600; I know we have Tribander reports and Vertical antenna reports, but has anyone ever tried to do one on coax? Do the specs and manufacturers change too often for it to be worthwhile? I am looking at pu; /archives//html/Towertalk/2013-02/msg00300.html (7,968 bytes)
137. Re: [TowerTalk] Coax (score: 1): Author: Cqtestk4xs@aol.com; Date: Sat, 23 Feb 2013 11:16:56 -0500 (EST); Save your money. JEFA tech for LMR 400. Been using it for years on my super station. Good stuff and cheap. $399/1000 ft spool. Bill K4XS/KH7XS In a message dated 2/23/2013 4:13:22 P.M. Coordinated Un; /archives//html/Towertalk/2013-02/msg00301.html (8,374 bytes)
138. Re: [TowerTalk] Coax (score: 1): Author: "Patrick Greenlee" <patrick_g@windstream.net>; Date: Sat, 23 Feb 2013 10:30:42 -0600; Ditto! I use LMR-400 exclusively for all long HF runs. Good stuff, if a little harder to prep for terminations than RG-8 is. When shipped by UPS or FEDEX the vendors ship 1000 ft as two reels of 500; /archives//html/Towertalk/2013-02/msg00302.html (9,555 bytes)
139. Re: [TowerTalk] Coax (score: 1): Author: Mike Reublin <nf4l@att.net>; Date: Sat, 23 Feb 2013 11:41:26 -0500; Please do yourselves a favor and look at Davis BuryFlex. http://www.davisrf.com/buryflex.php 73, Mike NF4L _______________________________________________ ____________________________________________; /archives//html/Towertalk/2013-02/msg00303.html (10,689 bytes)
140. Re: [TowerTalk] Coax (score: 1): Author: Phil Snyder <n9lah@comcast.net>; Date: Sat, 23 Feb 2013 10:48:04 -0600; I guess I should mention the reason for the purchase is initially for my 2 meter SSB run but was looking to use it for HF and up to 432 in the future. Phil N9LAH On 2/23/2013 10:13 AM, Phil Snyder wr; /archives//html/Towertalk/2013-02/msg00304.html (8,838 bytes)

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