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1. [RFI] ISOBAR (score: 1): Author: Scott Yost <nm8rmedic@rocketmail.com>; Date: Sat, 15 Sep 2012 17:26:56 -0700 (PDT); Is Isobar still considered a decent product for RFI reduction or has it been eclipsed by some other manufacturer? The Isobar website seems thin on specs for noise suppresion data. Interested in spe; /archives//html/RFI/2012-09/msg00089.html (6,765 bytes)
2. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 15 Sep 2012 18:46:51 -0700; I can't comment about RF filtering, but it's an MOV box, which is BAD NEWS on a branch circuit. Also, none of the commercial line filters do anything to kill common mode current on the AC cable (whic; /archives//html/RFI/2012-09/msg00090.html (8,323 bytes)
3. Re: [RFI] ISOBAR (score: 1): Author: Christopher Brown <cbrown@woods.net>; Date: Sun, 16 Sep 2012 01:20:14 -0800; They are differential mode only, standard cap and powdered iron inductor. The interesting bit is that they are multi-stage, not just filtering from line, but between stages. They have stopped printin; /archives//html/RFI/2012-09/msg00092.html (8,735 bytes)
4. Re: [RFI] ISOBAR (score: 1): Author: Christopher Brown <cbrown@woods.net>; Date: Sun, 16 Sep 2012 01:22:19 -0800; Care to explain or provide a ref? _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2012-09/msg00093.html (6,840 bytes)
5. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 16 Sep 2012 10:12:57 -0700; On 9/15/12 5:46 PM, Jim Brown wrote: I can't comment about RF filtering, but it's an MOV box, which is BAD NEWS on a branch circuit. Care to explain or provide a ref? The fundamental problem is that; /archives//html/RFI/2012-09/msg00094.html (10,360 bytes)
6. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 16 Sep 2012 13:57:32 -0700; There would not be the potential difference problem, but the inherent problems of MOVs (lifetime, blowing up (they DO blow up if you hit them with surges at the 6kV that IEEE studies show can exist o; /archives//html/RFI/2012-09/msg00095.html (8,797 bytes)
7. Re: [RFI] ISOBAR (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Mon, 17 Sep 2012 06:20:45 -0400; Our whole-house protector (from the power company) comes with good insurance for things inside the house provided that you cascade a point-of-use surge protector. They seem to assume that the latter; /archives//html/RFI/2012-09/msg00096.html (11,871 bytes)
8. Re: [RFI] ISOBAR (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Mon, 17 Sep 2012 06:22:04 -0400; This happened to me repeatedly with nearby strikes, until I went to a wireless network. 73, Pete N4ZR The World Contest Station Database, at www.conteststations.com The Reverse Beacon Network at http; /archives//html/RFI/2012-09/msg00097.html (8,314 bytes)
9. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 17 Sep 2012 09:46:56 -0700; On 9/17/2012 3:20 AM, Pete Smith N4ZR wrote: Our whole-house protector (from the power company) comes with good insurance for things inside the house provided that you cascade a point-of-use surge pr; /archives//html/RFI/2012-09/msg00098.html (9,808 bytes)
10. Re: [RFI] ISOBAR (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Mon, 17 Sep 2012 22:14:40 -0400; I guess what I was asking was whether the snubbing at the power entry would allow MOVs to work for the branch circuit protection a cost-effective share of the time. I have experienced problems with E; /archives//html/RFI/2012-09/msg00104.html (11,141 bytes)
11. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 17 Sep 2012 19:47:51 -0700; On 9/17/2012 7:14 PM, Pete Smith N4ZR wrote: I guess what I was asking was whether the snubbing at the power entry would allow MOVs to work for the branch circuit protection a cost-effective share of; /archives//html/RFI/2012-09/msg00105.html (8,576 bytes)
12. Re: [RFI] ISOBAR (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 18 Sep 2012 01:17:46 -0400; Strange choice of names as Isobar is a symbol used on weather maps. OTOH I had never heard of them as a company. 73 Roger (K8RI) I have an old unit that performs well. Not sure if their past perform; /archives//html/RFI/2012-09/msg00106.html (8,538 bytes)
13. Re: [RFI] ISOBAR (score: 1): Author: dalej <dj2001x@comcast.net>; Date: Tue, 18 Sep 2012 04:17:44 -0500; Isobar is under the Trip-Lite name. I had a six outlet Isobar, but the insides were not quite what I expected and now I can't find the darned thing. I suspect I might have tossed it in the recycle bi; /archives//html/RFI/2012-09/msg00107.html (9,264 bytes)
14. Re: [RFI] ISOBAR (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Tue, 18 Sep 2012 07:30:43 -0400; I use a piece of 3/4 inch copper pipe running along the rear of my desk as a ground bus. All of my radios, computers etc. are fed off a single branch, and each is grounded to the pipe by a short, dir; /archives//html/RFI/2012-09/msg00108.html (10,034 bytes)
15. Re: [RFI] ISOBAR (score: 1): Author: "Dale Svetanoff" <svetanoff@earthlink.net>; Date: Tue, 18 Sep 2012 09:46:55 -0500; Pete, Two questions: 1) That 40 feet of bare #2 wire between the entrance panel and power line ground - I assume it is run outside, and if so, how many ground rods are on it? 2) Does the wire provide; /archives//html/RFI/2012-09/msg00109.html (12,539 bytes)
16. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 09:56:10 -0500 (CDT); the one thing that many people forget is that it is not just the impedance, its the distance. The size of a typical shack, house, and grounding system, is NOT small with respect to the wavelengths in; /archives//html/RFI/2012-09/msg00110.html (8,405 bytes)
17. Re: [RFI] ISOBAR (score: 1): Author: "Dale Svetanoff" <svetanoff@earthlink.net>; Date: Tue, 18 Sep 2012 10:59:07 -0500; David, The intent of saying "net Z" was to include the length of the grounding lead(s), plus remembering that any significant bends will appear as a turn on an inductor. With regard to physical objec; /archives//html/RFI/2012-09/msg00111.html (11,392 bytes)
18. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 11:36:23 -0500 (CDT); not necessarily... yes, but its not the resistance that matters in the case of a lightning stroke (or even when talking about 'rf' grounds)... the length has MUCH more of an effect than the resistan; /archives//html/RFI/2012-09/msg00113.html (10,769 bytes)
19. Re: [RFI] ISOBAR (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 18 Sep 2012 09:49:15 -0700; David, In Dale's first post on this topic, he made it quite clear that it was the IMPEDANCE over the range of 100 kHz to 10 MHz that mattered, which quite clearly is virtually all inductance. Further; /archives//html/RFI/2012-09/msg00114.html (8,877 bytes)
20. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 12:12:48 -0500 (CDT); the basic problem of understanding the biggest lightning problems is throwing away the traditional concepts of inductance and resistance, and even impedance. most hams and even electrical engineers u; /archives//html/RFI/2012-09/msg00116.html (9,703 bytes)

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