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21. Re: [TowerTalk] Coax Question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 13 Apr 2010 08:31:13 -0700; The additional loss due to a 2:1 mismatch is almost negligible (a few tenths of a dB). 73, Jim K9YC _______________________________________________ _______________________________________________ Tow; /archives//html/Towertalk/2010-04/msg00354.html (9,573 bytes)
22. Re: [TowerTalk] Coax Question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 13 Apr 2010 08:33:53 -0700; Yes, BUT -- coax loss on RX only matters if the limitation is noise in your receiver. That is VERY RARE on the HF bands, where the major limitation is either QRM or noise picked up on the antenna. In; /archives//html/Towertalk/2010-04/msg00355.html (9,071 bytes)
23. Re: [TowerTalk] Coax Question (score: 1): Author: Cqtestk4xs@aol.com; Date: Tue, 13 Apr 2010 11:52:39 EDT; New connectors for 7/8" as well as LMR 1200 are expensive. Why pay good money for them. As has been mentioned before on this list, it's pretty easy to make your own from copper reducers and hose clam; /archives//html/Towertalk/2010-04/msg00356.html (8,342 bytes)
24. Re: [TowerTalk] Coax Question (score: 1): Author: "F.R. Ashley" <gdadx2@clearwire.net>; Date: Tue, 13 Apr 2010 16:59:05 -0400; Feed line is the last place you want to save money. I'd go with the hardline and flex up the tower also. _______________________________________________ ______________________________________________; /archives//html/Towertalk/2010-04/msg00373.html (12,223 bytes)
25. Re: [TowerTalk] Coax Question (score: 1): Author: "D Calder" <towertalk@n4zkf.com>; Date: Tue, 13 Apr 2010 17:23:43 -0400; Maybe I missed it somewhere. Is this ONE run? 500 ft. 73 Dave n4zkf Feed line is the last place you want to save money. I'd go with the hardline and flex up the tower also. __________________________; /archives//html/Towertalk/2010-04/msg00378.html (12,843 bytes)
26. Re: [TowerTalk] Coax Question (score: 1): Author: "Gene Fuller" <w2lu@rochester.rr.com>; Date: Tue, 13 Apr 2010 17:53:08 -0400; For a long run, if you wanted to save some money, and you could put up with the other inconviences, and if you could find good 9:1 baluns, you might consider 450 Ohm twin lead. Gene / W2LU -- Origina; /archives//html/Towertalk/2010-04/msg00379.html (13,252 bytes)
27. Re: [TowerTalk] Coax Question (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 13 Apr 2010 14:54:55 -0700; I have 850 feet of 450 ohm line with homebrew 9:1 baluns each end. Works great. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mai; /archives//html/Towertalk/2010-04/msg00380.html (9,798 bytes)
28. Re: [TowerTalk] Coax Question (score: 1): Author: <john@kk9a.com>; Date: Tue, 13 Apr 2010 18:03:30 -0400; I concur. I put all of my remote switches at the base of the tower and run separate feedlines to each antenna. It's so much easier to work on. John KK9A My choice is at least 7/8 heliax and some lmr6; /archives//html/Towertalk/2010-04/msg00383.html (8,909 bytes)
29. Re: [TowerTalk] Coax Question (score: 1): Author: <john@kk9a.com>; Date: Tue, 13 Apr 2010 18:17:07 -0400; I think that this is band dependant. If you're operating 20m during a contest, QRM is much more of a factor in hearing a station than the received signal strength. Your antenna will still have the sa; /archives//html/Towertalk/2010-04/msg00385.html (9,641 bytes)
30. Re: [TowerTalk] Coax Question (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 13 Apr 2010 21:53:49 -0700; Use an 802.11 wireless LAN link with directional antennas. Now all you do is run AC power out there. _______________________________________________ _______________________________________________ To; /archives//html/Towertalk/2010-04/msg00409.html (10,562 bytes)
31. [TowerTalk] Coax Question (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 14 Apr 2010 02:16:44 -0700; The kicker is... if you have say 3 db of loss back to the station, then you need an extra 3db of drive power. You also LOSE 3 db on RX ! You also require a LONG run of 240 vac line, to base of tower,; /archives//html/Towertalk/2010-04/msg00416.html (11,955 bytes)
32. Re: [TowerTalk] Coax Question (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 14 Apr 2010 06:47:15 -0700; Or a run of the mill 240VAC line and a boost/buck transformer to make up the voltage drop at the load end. There are other reasons why one might want a back to back transformer approach (galvanic iso; /archives//html/Towertalk/2010-04/msg00428.html (13,161 bytes)
33. Re: [TowerTalk] Coax Question (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Wed, 14 Apr 2010 15:09:27 -0400; This is just one of the ways for adapting 3/4" to UHF http://www.rogerhalstead.com/ham_files/conn.htm 73 Roger (K8RI) _______________________________________________ _________________________________; /archives//html/Towertalk/2010-04/msg00443.html (13,814 bytes)
34. [TowerTalk] Coax Question (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 22 Feb 2012 16:44:27 -0700; I am planning on taking two lengths of 75 ohm coax, running them parallel to each other, and connecting the shields together, to create a 150 ohm parallel line from the two center conductors. Is ther; /archives//html/Towertalk/2012-02/msg00363.html (6,708 bytes)
35. Re: [TowerTalk] Coax Question (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Wed, 22 Feb 2012 20:10:42 -0800; Nope..it's exactly the same. You can even BUY double 75 ohm coax fairly inexpensively (although probably not as cheap as 2 single strands) _______________________________________________ ____________; /archives//html/Towertalk/2012-02/msg00365.html (6,947 bytes)
36. Re: [TowerTalk] Coax Question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 23 Feb 2012 08:41:14 +0000; And the matched loss per unit length of the resulting 150 Ohm twin will also be exactly the same as the 75 Ohm coax. Steve G3TXQ _______________________________________________ ______________________; /archives//html/Towertalk/2012-02/msg00367.html (7,098 bytes)

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