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Total 7 documents matching your query.

1. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>; Date: Tue, 6 Mar 2007 09:06:45 -0500; Three turns of wire on one of those snap on cores (the rectangular cores that snap onto each other and come two to a pack) measures, inaccurately, on my MFJ-259 160m: 2+j25 80m: 14+j45 40m: 36+j60 2; /archives//html/Towertalk/2007-03/msg00063.html (7,369 bytes)
2. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 06 Mar 2007 07:32:47 -0800; Ferrite chokes are essentially very low Q parallel resonant circuits. Antenna analyzers are not very useful for measuring ferrite chokes, for at least two reasons. First, they have a fairly low input; /archives//html/Towertalk/2007-03/msg00065.html (9,597 bytes)
3. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>; Date: Tue, 6 Mar 2007 10:55:27 -0500; Jim, I didn't mean to detract from the suggestion to look at your very good tutorial... that's excellent work and very useful. I just had measured the Radio Shack cores particularly (and they don't s; /archives//html/Towertalk/2007-03/msg00066.html (8,822 bytes)
4. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 06 Mar 2007 08:02:24 -0800; I agree (although it has to guess at the sign of the impedance). The most important thing is that we understand the limitations of our test equipment, which you clearly do. 73, Jim __________________; /archives//html/Towertalk/2007-03/msg00067.html (7,550 bytes)
5. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Tue, 06 Mar 2007 09:33:05 -0800; Could one estimate that parasitic C by sweeping the analyzer and looking for the resonance? And, if you can assure yourself that the resonance is "far" away from the frequency of interest, one can ig; /archives//html/Towertalk/2007-03/msg00068.html (9,342 bytes)
6. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 06 Mar 2007 10:11:00 -0800; Good question. See below. Yes. If you're buying surplus clamp-ons and cylinders used for RFI suppression, it's most likely that they're #43, and a single turn (that is, the wire going through the cor; /archives//html/Towertalk/2007-03/msg00069.html (10,939 bytes)
7. Re: [TowerTalk] [RFI] HIGH POWER and RFI... (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Tue, 06 Mar 2007 10:26:19 -0800; A<snip of useful stuff> I find that as I get older, and my free time less and income more, that ordering "known quantities" from the catalog is more productive at getting the job done. But there stil; /archives//html/Towertalk/2007-03/msg00071.html (8,672 bytes)

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