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181. Re: [RFI] Fan Noise on Repeater (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 9 May 2006 09:01:04 -0400; Most common and forgotten is the noise is most often caused by the fan shaking something that is loose. A loose connector, a loose connection, a pressure fit connection, a bad metal to metal contact; /archives//html/RFI/2006-05/msg00004.html (8,564 bytes)
182. Re: [RFI] Power line Noise (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 8 Jun 2006 19:54:00 -0400; During times when bands are closed here, background noise peaks to the west and east. It comes from an accumulation of many small sources in Barnesville and Forsyth...each about 5-7 miles away. When; /archives//html/RFI/2006-06/msg00022.html (8,600 bytes)
183. Re: [RFI] grounding your ham equipment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 29 Jul 2006 16:39:40 -0400; I'd wager you missed something else besides the LAN cable, like perhaps a bond between all the cables entering the room? I have nowhere near that type of ground system at the house, don't have a sin; /archives//html/RFI/2006-07/msg00012.html (9,707 bytes)
184. Re: [RFI] grounding your ham equipment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 29 Jul 2006 16:43:29 -0400; That's all fine, but a ground won't prevent a tower from getting hit. The best ground in the world will make zero difference in the number of strikes. 73 Tom ________________________________________; /archives//html/RFI/2006-07/msg00014.html (9,104 bytes)
185. Re: [RFI] grounding your ham equipment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 30 Jul 2006 06:06:55 -0400; ....and the entrance panel is bonded to the shack cable entrance how? I have a halo ground buss. It's buried copper tubing that circles my house. I wouldn't be without it, even though the only groun; /archives//html/RFI/2006-07/msg00018.html (10,112 bytes)
186. Re: [RFI] grounding your ham equipment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 30 Jul 2006 10:36:57 -0400; That's what I have. That's almost what I have. The strip runs along the main bench level's surface but just under the rear edge. I think it is a problem. I'd rather have no connection at all then so; /archives//html/RFI/2006-07/msg00020.html (10,975 bytes)
187. Re: [RFI] grounding your ham equipment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 30 Jul 2006 10:50:54 -0400; That may be true. Maybe modern jargon defines this as a perimeter ground now. I try to follow a rule that everything in every equipment group has one common ground point and that all cables enter an; /archives//html/RFI/2006-07/msg00021.html (9,870 bytes)
188. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 8 Aug 2006 17:49:44 -0400; If you are not local noise limited, noise on lower bands (below 40) always goes up at night. Above 40 if you are not local noise limited, noise goes up when the band is open in the direction of the; /archives//html/RFI/2006-08/msg00003.html (7,055 bytes)
189. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 10 Aug 2006 06:16:22 -0400; The sun certainly can cause noise that we hear above 10-15 MHz or so, as we can also hear accumulated noise from other galactic sources. All it takes is a low terrestrial noise level and very low io; /archives//html/RFI/2006-08/msg00013.html (12,529 bytes)
190. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 10 Aug 2006 11:59:15 -0400; Far field generally is at distance beyond 1/2 wl or 1 wl for small antennas but can be further for very large antennas. In a small loop the field is magnetically dominant within about 1/10th wave, a; /archives//html/RFI/2006-08/msg00018.html (11,797 bytes)
191. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 10 Aug 2006 14:30:02 -0400; Which only means a loop has a null that can be positioned to single direction noise sources. It doesn't mean the shield actually does anything. It doesn't mean the loop is "magnetic". 73 Tom _______; /archives//html/RFI/2006-08/msg00021.html (8,714 bytes)
192. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 11 Aug 2006 21:41:36 -0400; Don't shoot the messenger! If you don't want to believe everyone from Faraday and Maxwell on down the food chain there probably isn't much I can do about it. What does that have to do with anything?; /archives//html/RFI/2006-08/msg00033.html (11,896 bytes)
193. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 12 Aug 2006 00:16:41 -0400; Jim, Let's deal with one basic useful fact at a time. Certainly, as long as it is static and not time-varying at high frequencies. Once the sheet is several skin depths thick, the answer is no. I'm n; /archives//html/RFI/2006-08/msg00036.html (11,112 bytes)
194. Re: [RFI] Towers/Antennas Near 138kV Transmission Lines (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 14 Aug 2006 19:00:33 -0400; Larry, In know a few people who live near lines like that and tell me they don't have problems. Every time I've been around lines like that I've had problems. In S. Amherst, Ohio I had problems with; /archives//html/RFI/2006-08/msg00041.html (9,232 bytes)
195. Re: [RFI] Towers/Antennas Near 138kV Transmission Lines (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 14 Aug 2006 19:00:34 -0400; Larry, In know a few people who live near lines like that and tell me they don't have problems. Every time I've been around lines like that I've had problems. In S. Amherst, Ohio I had problems with; /archives//html/RFI/2006-08/msg00042.html (9,236 bytes)
196. Re: [RFI] Towers/Antennas Near 138kV Transmission Lines FRAUD ALERT (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 15 Aug 2006 09:25:36 -0400; The power line brush growth thing occurred because ( no surprise ) the utility company disturbed the environment under the line soil by cutting the brush, spraying, and driving over the soil with ve; /archives//html/RFI/2006-08/msg00048.html (10,871 bytes)
197. Re: [RFI] Home networking birdies (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 20 Sep 2006 08:07:51 -0400; Think of the offending device as a transmitter and the attached cables as parts of an antenna. Also consider the frequency. Looking at things this way gives you a feel for what is happening. For exa; /archives//html/RFI/2006-09/msg00029.html (12,764 bytes)
198. Re: [RFI] Cable TV Interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 21 Sep 2006 19:57:42 -0400; David, TV sets use 4.5MHz IF and some subcarrier frequencies in that range and high as an FM (audio) IF. I can hear the sound carrier from what I suspect is the composite video cable connects betwee; /archives//html/RFI/2006-09/msg00033.html (8,106 bytes)
199. Re: [RFI] Cable TV Interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 21 Sep 2006 19:58:25 -0400; David, TV sets use 4.5MHz IF and some subcarrier frequencies in that range and higher as an FM (audio) IF. I can hear the sound carrier from what I suspect is the composite video cable connects betw; /archives//html/RFI/2006-09/msg00034.html (7,674 bytes)
200. Re: [RFI] DFing an HF RFI source (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 17 Oct 2006 14:36:24 -0400; Same here. As a rule arcs, as created in a poorly installed fence, are very wide bandwidth with very gradual level changes as receiver frequency is varied. Tics that are band specific or periodic in; /archives//html/RFI/2006-10/msg00021.html (9,177 bytes)

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