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Total 19 documents matching your query.

1. [RFI] Ambient Noise Levels (score: 1): Author: "Kelly Johnson" <n6kj.kelly@gmail.com>; Date: Tue, 8 Aug 2006 14:20:50 -0700; In the morning (let's say 7am local time) my "ambient noise" on 40 meters is about S0 to S1. In the evening (let's say 10pm local time) it is S4 to S5. Normally, 14Mhz and up tend to behave the oppos; /archives//html/RFI/2006-08/msg00002.html (7,160 bytes)
2. 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)
3. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Kelly Johnson" <n6kj.kelly@gmail.com>; Date: Tue, 8 Aug 2006 15:45:41 -0700; I didn't know that low bands behaved like that. Thanks for the info. This is a relief. Now I don't have to go scouring the neighborhood to find the source of my increased noise level at night :-) ___; /archives//html/RFI/2006-08/msg00004.html (7,449 bytes)
4. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Tue, 8 Aug 2006 20:39:27 -0500; Yeah, it probably is "atmospheric" since everyone seems to attribute the 'blame' that way (but I would ask you or anyone else to cite me "studied work" on the subject to support that contention.) Cha; /archives//html/RFI/2006-08/msg00005.html (8,278 bytes)
5. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 08 Aug 2006 22:45:48 -0700; I agree with Tom -- it's noise from far away, propagated just like any other RF signal. When 6M is open, for example, I hear birdies that I don't hear when it isn't. And during a major blackout not l; /archives//html/RFI/2006-08/msg00006.html (7,094 bytes)
6. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Wed, 9 Aug 2006 21:58:25 -0500; Jim, Are you saying that you hear power-line (and other non-intentionally generated, incidental) 'noise' (like blenders, brush-type drill motors and the like) originating from far away, e.g. hundreds; /archives//html/RFI/2006-08/msg00007.html (8,761 bytes)
7. Re: [RFI] Ambient Noise Levels (score: 1): Author: Fred Stevens K2FRD <k2frd@mac.com>; Date: Wed, 9 Aug 2006 20:59:39 -0700; Not sure it's pertinent here, but I also have high white noise levels (S4 to S6, sometimes more, sometimes less) on 40m with a trap dipole (10, 15, 20, 40m) up 40' in the middle. And I'm located far; /archives//html/RFI/2006-08/msg00008.html (9,037 bytes)
8. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 09 Aug 2006 21:15:53 -0700; Yes, and this is exactly what W8JI is saying too. When noise is generated, it can cause current to flow in a wire, and that wire will act as an antenna, just like any other wire carrying RF current.; /archives//html/RFI/2006-08/msg00009.html (9,114 bytes)
9. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Wed, 9 Aug 2006 23:20:26 -0500; I HAVE heard brief, slow rises and falls of broad-band white noise several times in the last couple of years on 10 Meters; the first time I thought the rig had experienced some sort of 'issue'. The n; /archives//html/RFI/2006-08/msg00010.html (11,492 bytes)
10. 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)
11. Re: [RFI] Ambient Noise Levels (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 10 Aug 2006 08:19:27 -0500; I did planetary and solar radio astronomy in the 1970s. This was done at HF and low VHF -- 7 to 80 MHz -- using a pair of large corner reflector antennas mounted on circular railroad tracks and confi; /archives//html/RFI/2006-08/msg00014.html (10,062 bytes)
12. Re: [RFI] Ambient Noise Levels (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 10 Aug 2006 09:32:05 -0400; The noise level is killing ham radio for me. I live on a small lot with several large trees and can only find room for a vertical antenna. My noise level on 20M this morning is S6/7. It rarely drops; /archives//html/RFI/2006-08/msg00015.html (10,631 bytes)
13. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 10 Aug 2006 13:07:42 -0400; One wonders what the impact of BPL on OTHER radio astronomy observatories might be...perhaps there's an ally there, in our public battle? Right now, it's clear that the executive branch is pushing pu; /archives//html/RFI/2006-08/msg00019.html (8,386 bytes)
14. Re: [RFI] Ambient Noise Levels (score: 1): Author: digital-conjurers@adelphia.net; Date: Thu, 10 Aug 2006 10:30:08 -0700; Just as an anecdotal side note, a homebrew shielded loop for 75M was the only thing that kept me operational on the band last year. I had a "Toy-Boy" neighbor who simply _had_ to have every piece of; /archives//html/RFI/2006-08/msg00020.html (9,090 bytes)
15. 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)
16. Re: [RFI] Ambient Noise Levels (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 10 Aug 2006 15:07:17 -0500; Unfortunately there is little HF radio astronomy going on these days other than some solar observations. But there is still a fair amount of atmospheric science remote sensing in this frequency range; /archives//html/RFI/2006-08/msg00024.html (9,396 bytes)
17. Re: [RFI] Ambient Noise Levels (score: 1): Author: Dave NØRQ <n0rq-lists@sbcglobal.net>; Date: Thu, 10 Aug 2006 18:05:30 -0500; What sort of noise? There are many types, many sources, many sounds. If it is power line noise, you might be interested in www.powerlinenoise.com (my site). If unsure of what type of noise, look at m; /archives//html/RFI/2006-08/msg00025.html (9,637 bytes)
18. Re: [RFI] Ambient Noise Levels (score: 1): Author: digital-conjurers@adelphia.net; Date: Thu, 10 Aug 2006 18:01:19 -0700; It's an interesting little antenna, the builder calls it a "Frame Antenna": http://web.telia.com/~u85920178/antennas/frameant.htm Had a lot of fun playing with it. -Lin/KJ6EF ________________________; /archives//html/RFI/2006-08/msg00026.html (8,594 bytes)
19. Re: [RFI] Ambient Noise Levels (score: 1): Author: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>; Date: Fri, 11 Aug 2006 20:32:55 +0000; radio observatories are usually in the sticks like the very large array in new mexico. also, i thought the fcc nprm for bpl had some sort of exclusionary language for science and government operation; /archives//html/RFI/2006-08/msg00029.html (9,423 bytes)

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