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Total 48 documents matching your query.

21. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 21 Apr 2016 02:58:05 -0400; I often ask, why purchase when building is easy,quick, and saves substantial cost. This does not appear to be an item that would see wide use in industry. OTOH, It takes little time to build one of t; /archives//html/Towertalk/2016-04/msg00320.html (15,474 bytes)
22. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 21 Apr 2016 03:28:00 -0400; I don't have any antennas that cover 3-30 MHz so why would I need a choke that covers that range? A quickly wound choke for the specific antenna is more than sufficient. Only if you want a choke for; /archives//html/Towertalk/2016-04/msg00321.html (14,686 bytes)
23. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 00:50:05 -0700; of those special one off SO-239s he uses, no Z bumps, silver /teflon /gold...PLUS shipping, then double shielded teflon coax, with silver braids + silver center conductor...PLUS shipping, then a UV /; /archives//html/Towertalk/2016-04/msg00322.html (13,100 bytes)
24. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 21 Apr 2016 06:42:20 -0700; I don't have any antennas that cover 3-30 MHz so why would I need a choke that covers that range? A quickly wound choke for the specific antenna is more than sufficient. Only if you want a choke for; /archives//html/Towertalk/2016-04/msg00325.html (11,044 bytes)
25. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 21 Apr 2016 08:01:04 -0700; You would save a lot if you did what I recommended about 8 years ago -- get together a group purchase and buy in quantity. I've been part of at least half a dozen, two of which I've organized. Append; /archives//html/Towertalk/2016-04/msg00327.html (14,846 bytes)
26. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 09:36:53 -0700; I don't have any antennas that cover 3-30 MHz so why would I need a choke that covers that range? A quickly wound choke for the specific antenna is more than sufficient. Only if you want a choke for; /archives//html/Towertalk/2016-04/msg00331.html (10,345 bytes)
27. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 10:16:55 -0700; K9YC said: You would save a lot if you did what I recommended about 8 years ago -- get together a group purchase and buy in quantity. I've been part of at least half a dozen, two of which I've organi; /archives//html/Towertalk/2016-04/msg00332.html (18,085 bytes)
28. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Tod <tod@k0to.us>; Date: Thu, 21 Apr 2016 12:12:54 -0600; As a matter of curiosity: You have a (CMC) Common Mode Choke in a feed line. You add another, identical, choke in line. If the first choke attenuates the common mode current by 20 dB, the what is the; /archives//html/Towertalk/2016-04/msg00334.html (11,861 bytes)
29. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 11:31:33 -0700; You have a (CMC) Common Mode Choke in a feed line. You add another, identical, choke in line. If the first choke attenuates the common mode current by 20 dB, the what is the total attenuation after y; /archives//html/Towertalk/2016-04/msg00335.html (9,970 bytes)
30. Re: [TowerTalk] CMC-230-5K (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 21 Apr 2016 11:35:31 -0700; You have a (CMC) Common Mode Choke in a feed line. You add another, identical, choke in line. If the first choke attenuates the common mode current by 20 dB, the what is the total attenuation after y; /archives//html/Towertalk/2016-04/msg00336.html (8,928 bytes)
31. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Thu, 21 Apr 2016 15:25:33 -0400; Do you have a choke on the rotator and antenna relay cables? Is there a benefit to choking these cables also? John KK9A If you have a good choke at the antenna and good coax, is there a reason for ha; /archives//html/Towertalk/2016-04/msg00338.html (9,163 bytes)
32. Re: [TowerTalk] CMC-230-5K (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 21 Apr 2016 12:39:02 -0700; John KK9A I choke everything. If it's a wire, and it's near the antenna, it's a potential radiator. In fact, on my mobile installation, I had worse RFI/EMC problems with the 12V control wires to the; /archives//html/Towertalk/2016-04/msg00340.html (8,809 bytes)
33. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 12:47:06 -0700; Good advice on all counts. Mobile installations are particularly problematic, because the body/chassis is used as a counterpoise for our antennas, bonding of body and chassis is often flaky (or non-e; /archives//html/Towertalk/2016-04/msg00341.html (9,048 bytes)
34. Re: [TowerTalk] CMC-230-5K (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 21 Apr 2016 13:00:51 -0700; Mobile installations are particularly problematic, because the body/chassis is used as a counterpoise for our antennas, bonding of body and chassis is often flaky (or non-existent, thanks to paint) a; /archives//html/Towertalk/2016-04/msg00342.html (10,333 bytes)
35. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 21 Apr 2016 16:13:12 -0400; I install chokes only when and where I find a need for them. I have no chokes in any rotator leads or remote antenna switch. I do have a choke on the leads into the control head in the shop for the 6; /archives//html/Towertalk/2016-04/msg00343.html (9,833 bytes)
36. Re: [TowerTalk] CMC-230-5K (score: 1): Author: <john@kk9a.com>; Date: Thu, 21 Apr 2016 20:27:34 -0400; I have ferrites on every cable too. I have quite a few cables and just wanted to ensure that it was not a complete waste of resources. John KK9A I choke everything. If it's a wire, and it's near the; /archives//html/Towertalk/2016-04/msg00346.html (8,247 bytes)
37. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Apr 2016 22:41:57 -0700; John, Remember that W3LPL observed last fall that equipment exposed to RF can generate harmonics, that will be radiated and picked up by our antennas. A characteristic of this is that the harmonics s; /archives//html/Towertalk/2016-04/msg00349.html (9,020 bytes)
38. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Ed Sawyer" <sawyered@earthlink.net>; Date: Fri, 22 Apr 2016 08:13:02 -0400; Guys, there is an RFI reflector. Can we take this ongoing dialog there please? Ed _______________________________________________ _______________________________________________ TowerTalk mailing lis; /archives//html/Towertalk/2016-04/msg00351.html (8,056 bytes)
39. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Tod <tod@k0to.us>; Date: Fri, 22 Apr 2016 08:19:27 -0600; Ed, There is indeed an RFI reflector. But, few if any, TowerTalk guys are on it. Admittedly this thread does not help guys assemble, purchase,design or install towers. It does provide some help on so; /archives//html/Towertalk/2016-04/msg00353.html (8,979 bytes)
40. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Fri, 22 Apr 2016 08:24:46 -0700; I agree with Tod. 73, Bob K6UJ There is indeed an RFI reflector. But, few if any, TowerTalk guys are on it. Admittedly this thread does not help guys assemble, purchase,design or install towers. It d; /archives//html/Towertalk/2016-04/msg00354.html (9,757 bytes)

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