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1. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 19 Apr 2016 03:30:38 -0700; I just received a pair of CMC-230-5K common mode chokes...from MyAntennas.com to experiment with. They are configured as a line isolator, with silver-teflon SO-239s on each side. They can also be con; /archives//html/Towertalk/2016-04/msg00256.html (7,387 bytes)
2. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Tue, 19 Apr 2016 07:54:24 -0700; Jim, Very well built. I am curious about one thing. Their write up states that this unit uses 4 cascaded ferrite cores. In the picture I can only see 2. Thanks for sharing ! Bob K6UJ On 4/19/16 3:30; /archives//html/Towertalk/2016-04/msg00261.html (8,177 bytes)
3. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 19 Apr 2016 08:47:35 -0700; Jim, Very well built. I am curious about one thing. Their write up states that this unit uses 4 cascaded ferrite cores. In the picture I can only see 2. Thanks for sharing ! Bob K6UJ from the pix. Ho; /archives//html/Towertalk/2016-04/msg00264.html (7,751 bytes)
4. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Chuck Dietz <w5prchuck@gmail.com>; Date: Tue, 19 Apr 2016 10:58:51 -0500; I read: "Two cascaded chokes (2) on four (4) large 2.4 (61mm) Ferrite cores" at: http://myantennas.com/wp/product/cmc-230-5k/ I don't see but two either, however, I assume there are two stacks of two; /archives//html/Towertalk/2016-04/msg00265.html (10,302 bytes)
5. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Tue, 19 Apr 2016 09:22:52 -0700; Chuck, I emailed MyAntennas this morning and they got right back to me. You are right, there are two stacks of two. Bob K6UJ Chuck W5PR Jim, Very well built. I am curious about one thing. Their write; /archives//html/Towertalk/2016-04/msg00266.html (10,475 bytes)
6. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 19 Apr 2016 10:06:02 -0700; There's something I don't understand here. In 2007, I published the research upon which all of this is built, with measured data for a broad range of chokes for the ham bands, and with full instructi; /archives//html/Towertalk/2016-04/msg00270.html (9,363 bytes)
7. Re: [TowerTalk] CMC-230-5K (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 19 Apr 2016 10:27:28 -0700; On 4/19/16 10:06 AM, Jim Brown wrote: There's something I don't understand here. In 2007, I published the research upon which all of this is built, with measured data for a broad range of chokes for; /archives//html/Towertalk/2016-04/msg00272.html (10,764 bytes)
8. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 19 Apr 2016 10:38:56 -0700; You've got the end of a run of coax in your hand -- how much time does it take to wind turns of coax through cores? :) 73, Jim _______________________________________________ ________________________; /archives//html/Towertalk/2016-04/msg00273.html (8,232 bytes)
9. Re: [TowerTalk] CMC-230-5K (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 19 Apr 2016 11:19:14 -0700; You've got the end of a run of coax in your hand -- how much time does it take to wind turns of coax through cores? :) Hours and hours, if you have to tell someone else how to do it in a written and; /archives//html/Towertalk/2016-04/msg00275.html (8,755 bytes)
10. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Tue, 19 Apr 2016 12:27:23 -0700; Jim, I am using your choke design on both of my beams. With all this discussion on chokes it got me to thinking. My tower is only 10 feet away from the back of the house. I'm not sure how much noise; /archives//html/Towertalk/2016-04/msg00277.html (10,164 bytes)
11. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 19 Apr 2016 13:02:28 -0700; Hi Bob, It can't hurt, but it's also unlikely to help unless your grounding and bonding is poor. It IS a good thing to add a second choke on feedlines for wires that are long enough to interact with; /archives//html/Towertalk/2016-04/msg00278.html (11,557 bytes)
12. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Jeff AC0C" <keepwalking188@ac0c.com>; Date: Tue, 19 Apr 2016 16:13:44 -0500; In my experience guys with antennas close to the house should do a RFI generator "bug hunt" a couple of times a year. Pickup by the antenna from the many directly radiated or re-radiated noise source; /archives//html/Towertalk/2016-04/msg00279.html (12,766 bytes)
13. Re: [TowerTalk] CMC-230-5K (score: 1): Author: <john@kk9a.com>; Date: Tue, 19 Apr 2016 17:48:35 -0400; I was also thinking that it's easy to wrap the indoor coax though a ferrite and eliminate the extra connectors and enclosure. If you have a good choke at the antenna and good coax, is there a reason; /archives//html/Towertalk/2016-04/msg00280.html (9,353 bytes)
14. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 19 Apr 2016 16:41:39 -0700; Hi John, The answer is no if you have already grounded the coax before it gets into the shack (for example, in an entry panel). But as I noted in my response to K6UJ, there are good reasons for using; /archives//html/Towertalk/2016-04/msg00282.html (8,953 bytes)
15. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 20 Apr 2016 06:29:52 -0700; There's something I don't understand here. In 2007, I published the research upon which all of this is built, with measured data for a broad range of chokes for the ham bands, and with full instructi; /archives//html/Towertalk/2016-04/msg00285.html (11,605 bytes)
16. [TowerTalk] CMC-230-5K (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 20 Apr 2016 06:43:11 -0700; I was also thinking that it's easy to wrap the indoor coax though a ferrite and eliminate the extra connectors and enclosure. If you have a good choke at the antenna and good coax, is there a reason; /archives//html/Towertalk/2016-04/msg00286.html (8,486 bytes)
17. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "ve4xt@mymts.net" <ve4xt@mymts.net>; Date: Tue, 19 Apr 2016 14:03:29 -0500; Sent from my iPad Less time than it takes to do www.anything..., dig out the credit card, enter your info, select your product, go to checkout and wait a week for delivery... If you already have the; /archives//html/Towertalk/2016-04/msg00294.html (10,054 bytes)
18. Re: [TowerTalk] CMC-230-5K (score: 1): Author: Chuck Dietz <w5prchuck@gmail.com>; Date: Wed, 20 Apr 2016 16:39:41 -0500; I have made a lot of baluns and ununs, but I'm going to buy one for a 160, 80, 40 fan dipole to put at 140 feet. I like the holes on each side for each wire. Chuck W5PR ______________________________; /archives//html/Towertalk/2016-04/msg00295.html (11,195 bytes)
19. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 21 Apr 2016 00:32:07 -0400; Two questions. Why are they (ARRL) calling common mode chokes, "the best kept secret" when they have been in the arsenal of many of us for some years. The photo looks like an 11 turn 2 core in series; /archives//html/Towertalk/2016-04/msg00317.html (12,067 bytes)
20. Re: [TowerTalk] CMC-230-5K (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 21 Apr 2016 02:19:24 -0400; My thoughts as well Jim as I said in an earlier post. 73 Roger (K8RI) On 4/19/2016 Tuesday 1:06 PM, Jim Brown wrote: There's something I don't understand here. In 2007, I published the research upon; /archives//html/Towertalk/2016-04/msg00319.html (11,321 bytes)

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