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1. [RFI] Computer RFI problem (score: 1): Author: ka5s@earthlink.net (Cortland Richmond); Date: Thu, 8 Aug 2002 11:9:33 -0700; Check out the drawing at http://www.cableone.net/ctj92/index.html?row1col2=r7.html Did you keep the "radials" away from the coax" Coupling from the coax to that point can couple noise on the coax int; /archives//html/RFI/2003-08/msg00005.html (6,794 bytes)
2. [RFI] Computer RFI problem (score: 1): Author: nwtncc@iswt.com (James C. Hall, MD); Date: Sat, 3 Aug 2002 17:28:48 -0500; Here is an interesting problem: I put up an old Cushcraft R-7000 on the roof as a secondary antenna. My primary antennae are on a tower 150 feet from the shack and perform very well without RFI diffi; /archives//html/RFI/2002-08/msg00000.html (7,694 bytes)
3. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 4 Aug 2002 09:34:24 +0100; Extra length of coax can help... but only if you do something useful with it. Remember first that the outer shield of the coax acts as an independent conductor (due to the skin effect). In this case; /archives//html/RFI/2002-08/msg00001.html (11,402 bytes)
4. [RFI] Computer RFI problem (score: 1): Author: nwtncc@iswt.com (James Hall); Date: Sun, 4 Aug 2002 11:19:27 -0500; Thank you Ian, for your very thoughtful response ! The antenna is about 50 feet from the operating position. Interestingly, it replaces a R7 vertical on which the fiberglass coupling at the base fail; /archives//html/RFI/2002-08/msg00002.html (13,777 bytes)
5. [RFI] Computer RFI problem (score: 1): Author: w7ti@dslextreme.com (Bill Turner); Date: Sun, 04 Aug 2002 10:15:13 -0700; _________________________________________________________ Be sure the antenna isn't mounted on something such as a pipe that is connected to the house ground. I had the same problem once with a six m; /archives//html/RFI/2002-08/msg00003.html (8,526 bytes)
6. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 4 Aug 2002 19:08:39 +0100; Since you need lights up there anyhow, can you pick a cooler time of day... or night? Given the total length of cable and the number of turns, you're sure to get the diameter right because you don't; /archives//html/RFI/2002-08/msg00004.html (8,760 bytes)
7. [RFI] Computer RFI problem (score: 1): Author: nwtncc@iswt.com (James C. Hall, MD); Date: Sun, 4 Aug 2002 13:52:41 -0500; I may have to pick a cooler time of the YEAR - this is the Deep South, sub-tropical (with humidity to match) - about 35 deg latitude. It's not a huge concern at the present - but would make a dandy S; /archives//html/RFI/2002-08/msg00005.html (9,723 bytes)
8. [RFI] Computer RFI problem (score: 1): Author: nwtncc@iswt.com (James Hall); Date: Sun, 4 Aug 2002 16:55:24 -0500; Hi Jim: You may just be right about other things in the house generating RFI, however, a grand majority of my problem went away by just turning the computer off. This being the case, proximity to the; /archives//html/RFI/2002-08/msg00006.html (12,221 bytes)
9. [RFI] Computer RFI problem (score: 1): Author: k6ll@juno.com (Dave Hachadorian); Date: Sun, 4 Aug 2002 15:18:47 +0000; Is it perhaps just the computer monitor that's making the noise? If so, there's not much you can do about it. By the way, Staples.com has a very quiet 17" monitor on sale this week for $80, after reb; /archives//html/RFI/2002-08/msg00007.html (8,678 bytes)
10. [RFI] Computer RFI problem (score: 1): Author: nwtncc@iswt.com (James Hall); Date: Sun, 4 Aug 2002 20:54:52 -0500; Dave: Yep, checked the monitor - changed it about a year ago from a Sony to a NEC 21" . Quietest monitor I've ever had ! Jamie; /archives//html/RFI/2002-08/msg00008.html (9,478 bytes)
11. [RFI] Computer RFI problem (score: 1): Author: k5uj@hotmail.com (Rob Atkinson, K5UJ); Date: Mon, 05 Aug 2002 16:46:59 +0000; I just started reading this thread--a bunch of guys have made most of their computer rfi go away by switching over to flat screen LCD monitors. Rob K5UJ --Original Message Follows-- From: James Hall; /archives//html/RFI/2002-08/msg00009.html (10,619 bytes)
12. [RFI] Computer RFI problem (score: 1): Author: k5uj@hotmail.com (Rob Atkinson, K5UJ); Date: Mon, 05 Aug 2002 23:22:21 +0000; I must say that I find this somewhat far-fetched. I'd like for someone to please explain how this can be, in particular the part about a feed line dropping down below a vertical antenna, in line wit; /archives//html/RFI/2002-08/msg00010.html (12,105 bytes)
13. [RFI] Computer RFI problem (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 6 Aug 2002 08:29:59 -0500; This makes the most sense to me as well. As long as the antenna system is properly grounded (RF & safety-wise) and the shack has a proper single-point ground system, then messing around at the anten; /archives//html/RFI/2002-08/msg00011.html (9,940 bytes)
14. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 6 Aug 2002 07:55:22 +0100; When it comes to "far-fetched" I'm obviously out of my league. I simply meant that <of all the cable layouts anyone would use in element will give maximum coupling. And indeed it will. -- 73 from Ian; /archives//html/RFI/2002-08/msg00012.html (9,672 bytes)
15. [RFI] Computer RFI problem (score: 1): Author: k5uj@hotmail.com (Rob Atkinson, K5UJ); Date: Tue, 06 Aug 2002 17:38:15 +0000; I'm seeing a reiteration of an earlier message with no explanation. Perhaps I have misunderstood what is meant by "...dropping it [the feedline] down vertically in line with the main antenna element.; /archives//html/RFI/2002-08/msg00013.html (10,948 bytes)
16. [RFI] Computer RFI problem (score: 1): Author: wa2bpe@infoblvd.net (WA2BPE); Date: Tue, 06 Aug 2002 15:22:38 -0400; Folks, FWIW, just got back from local Staples store. There *is* a rebate of **$70** on the 710e (and $50 on other"selected" models) but: 1. you may have to ask for the rebate slip - none were "in sig; /archives//html/RFI/2002-08/msg00014.html (9,848 bytes)
17. [RFI] Computer RFI problem (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 6 Aug 2002 14:49:23 -0500; Rob, This is exactly the way we have mounted 7 out of 9 of our 800 Mhz colinear verticals on our 500 foot towers here in Nebraska. The reason? Lightning protection/suppression. Before I came along a; /archives//html/RFI/2002-08/msg00015.html (10,047 bytes)
18. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 6 Aug 2002 22:29:35 +0100; Yes, that's correct. The main antenna element goes vertically upward from the feedpoint. The coax goes vertically downward from the feedpoint. A straight vertical line, extending upward from the grou; /archives//html/RFI/2002-08/msg00016.html (10,237 bytes)
19. [RFI] Computer RFI problem (score: 1): Author: k5uj@hotmail.com (Rob Atkinson, K5UJ); Date: Wed, 07 Aug 2002 17:13:53 +0000; Very good; so then we are thinking of the same configuration. Once again, I would like an explanation as to why this causes a maximum amount of coupling of unwanted noise between the antenna and feed; /archives//html/RFI/2002-08/msg00018.html (11,249 bytes)
20. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 7 Aug 2002 22:46:16 +0100; My apologies, Rob. Now that we're talking the same language, that's a very good question indeed... I thought I knew the answer, but you made me see that I didn't! To check this more carefully, I put; /archives//html/RFI/2002-08/msg00020.html (11,306 bytes)

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