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Total 20 documents matching your query.

1. [RFI] Line noise vs Frequency (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Sun, 8 Aug 2021 08:24:33 -0400; A (probably) dumb question: I have a severe line noise to my west. For some reason it is manageable on 20, much worse on 15 and crippling on 10. These subjective descriptions are confirmed on my S; /archives//html/RFI/2021-08/msg00000.html (6,303 bytes)
2. Re: [RFI] Line noise vs Frequency (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Sun, 8 Aug 2021 09:07:22 -0400; Hi Stephanie - I know that. I've been chasing line noise (and other noises) for 30 years or more, and have never encountered this inverse frequency dependence before, which is why I asked. I have bo; /archives//html/RFI/2021-08/msg00001.html (9,997 bytes)
3. Re: [RFI] Line noise vs Frequency (score: 1): Author: Stephanie WX3K via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 08:50:21 -0400; Hard to really say what the exact root cause without further information The character of the noise will you what the source may be. Share an audio clip of it. Do you have a real time pandapter in yo; /archives//html/RFI/2021-08/msg00002.html (9,240 bytes)
4. Re: [RFI] Line noise vs Frequency (score: 1): Author: Stephanie WX3K via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 09:10:30 -0400; Please share a clip of the audio. Would love to hear it Stephanie WX3K _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/RFI/2021-08/msg00003.html (10,921 bytes)
5. Re: [RFI] Line noise vs Frequency (score: 1): Author: Michael Carter <Mike.Carter@unh.edu>; Date: Sun, 8 Aug 2021 13:18:14 +0000; Pete, I find similar patterns of power line arc noise, but I have only a single 135 foot doublet, center fed with window line, as my antenna. That antenna exhibits multiple azimuthal lobes on the hig; /archives//html/RFI/2021-08/msg00004.html (11,478 bytes)
6. Re: [RFI] Line noise vs Frequency (score: 1): Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>; Date: Sun, 8 Aug 2021 13:27:34 +0000; Most of the time, sparking/arcing noise is louder at lower frequencies. This happens for two reasons -- the noise is stronger at lower frequencies and the long power lines that the noise gets coupled; /archives//html/RFI/2021-08/msg00005.html (10,577 bytes)
7. Re: [RFI] Line noise vs Frequency (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 09:42:10 -0400; I have had ones like that here off and on. Usually traced to pole guy wires that had loose or corroded connection to the pole ground. The utility here has started adding a 5' or so insulating section; /archives//html/RFI/2021-08/msg00006.html (8,769 bytes)
8. Re: [RFI] Line noise vs Frequency (score: 1): Author: Wes Stewart via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 14:39:50 +0000 (UTC); I have a nearly identical problem. Based upon my direction finding, my coop power company rfi guy (also a Tech ham) has isolated the location to a spot about .4 mile away but has yet to get it fixed; /archives//html/RFI/2021-08/msg00007.html (9,140 bytes)
9. Re: [RFI] Line noise vs Frequency (score: 1): Author: Joseph Bouchard <joek1vw@gmail.com>; Date: Sun, 8 Aug 2021 11:16:32 -0400; Hi, Here is a thought... because most of us struggle with noise on the low bands we tend to use chokes which were designed to suppress common mode currents on the low bands effectively, and if it sup; /archives//html/RFI/2021-08/msg00008.html (8,540 bytes)
10. [RFI] Line noise vs Frequency (score: 1): Author: Charles Plunk <af4o@twc.com>; Date: Sun, 8 Aug 2021 10:35:37 -0500; Interesting you would bring this up. My current 120hz target peaks at roughly 19.5mhz. Falling off below roughly 10mhz to where its almost insignificant and goes up to about the 2 meter band where it; /archives//html/RFI/2021-08/msg00009.html (10,250 bytes)
11. Re: [RFI] Line noise vs Frequency (score: 1): Author: "qrv@kd4e.com" <qrv@kd4e.com>; Date: Sun, 8 Aug 2021 11:40:31 -0400; If the rain is stopping it - perhaps the conductivity of the soil is a variable? I seem to recall that they have a soil additive to improve grounding. (Salt works, but eats the wire!) Just a thought; /archives//html/RFI/2021-08/msg00010.html (10,272 bytes)
12. Re: [RFI] Line noise vs Frequency (score: 1): Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>; Date: Sun, 8 Aug 2021 16:47:22 +0000; The most common effect is that rain or high humidity swells wood structures, tightening up hardware on the pole. The cause is pretty much secondary, because you aren't going to be able to fix it. Fin; /archives//html/RFI/2021-08/msg00011.html (11,263 bytes)
13. Re: [RFI] Line noise vs Frequency (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 14:00:35 -0400; Rain can also fill small gaps in hardware causing the arcing to become just a steady current. It can also increase conductivity of dirty or damaged insulator surfaces so again they pass a continuous; /archives//html/RFI/2021-08/msg00012.html (12,330 bytes)
14. Re: [RFI] Line noise vs Frequency (score: 1): Author: David Decoons <rocketnj@gmail.com>; Date: Sun, 8 Aug 2021 15:02:49 -0400; This discussion has been very informative. I need to get the power company back out. One of two poles on my property has the HV for our neighborhood terminate on it. On dry breezy days I get bad arci; /archives//html/RFI/2021-08/msg00013.html (14,115 bytes)
15. Re: [RFI] Line noise vs Frequency (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 22:16:03 +0000 (UTC); We had a spate of doorbell transformers 'go' in this housing development years back, the higher freqs like 10 meters were affected most, on account of the wiring being probably on the order of the ap; /archives//html/RFI/2021-08/msg00020.html (9,953 bytes)
16. Re: [RFI] Line noise vs Frequency (score: 1): Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>; Date: Tue, 10 Aug 2021 14:13:33 +0000; Pete, Ed Hare's description of the metal cross-arm on a pole structure is exactly what our RFI investigator and line troubleshooter found on a pole on the Salvation Army campus in Omaha. The RFI tech; /archives//html/RFI/2021-08/msg00023.html (10,911 bytes)
17. Re: [RFI] Line noise vs Frequency (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Tue, 10 Aug 2021 10:54:25 -0400; Thanks, guys - I went out with my HF DF rig, and the one thing I'm pretty sure of is that the point source is not nearby. Anywhere along the neighborhood-level feed that runs along the West side of; /archives//html/RFI/2021-08/msg00024.html (11,848 bytes)
18. Re: [RFI] Line noise vs Frequency (score: 1): Author: Charles Plunk <af4o@twc.com>; Date: Tue, 10 Aug 2021 12:54:03 -0500; Sounds like my neighborhood. In locating my last source (a horrible 20-30 over S9 on 75m), the most significant break through for me was matching the noise pattern to what I was hearing in my hf rece; /archives//html/RFI/2021-08/msg00025.html (10,416 bytes)
19. Re: [RFI] Line noise vs Frequency (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Tue, 10 Aug 2021 13:05:38 -0500; I've been doing just that for years, and agree completely with Chuck that it's a key. You otherwise will waste your time tracking the wrong sources. Put the station HF receiver in AM mode, turn the A; /archives//html/RFI/2021-08/msg00026.html (11,689 bytes)
20. Re: [RFI] Line noise vs Frequency (score: 1): Author: Charles Plunk <af4o@twc.com>; Date: Tue, 10 Aug 2021 13:50:14 -0500; I give all the credit for locating my last source to this group including the matching the noise source tip. I am archiving all posts on this group for future reference. Listening to 30m at this time; /archives//html/RFI/2021-08/msg00027.html (10,263 bytes)

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