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Total 33 documents matching your query.

21. Re: [RFI] Quidance on finding noise? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Thu, 9 Jan 2020 14:06:34 -0500; Hi Jim, I will try and repeat with my scope triggered on line noise when I get home from work. When I used a sound card scope I only saw big spikes at a frequency of 60 Hz but could have been fooled; /archives//html/RFI/2020-01/msg00057.html (14,500 bytes)
22. Re: [RFI] Quidance on finding noise? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Thu, 9 Jan 2020 15:39:15 -0500; Hi Jim, I looked at that RFI noise in sync with 60 hertz video you wanted me to look at using my soundcard scope, and attached is what I captured. Very obvious 120 hertz. I also just took another loo; /archives//html/RFI/2020-01/msg00058.html (14,604 bytes)
23. Re: [RFI] Quidance on finding noise? (score: 1): Author: Michael Martin <mike@rfiservices.com>; Date: Thu, 09 Jan 2020 17:31:04 -0500; Not an arcing source. Get BlueMail for Android _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2020-01/msg00059.html (16,237 bytes)
24. Re: [RFI] Quidance on finding noise? (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Thu, 9 Jan 2020 23:50:16 +0000 (UTC); One 'arc' strike per half cycle is visible (like a spark gap transmission), yet, not an arc. Have you ever seen an O-scope used this way? Synced to the line rate? To see the strikes per cycle? This m; /archives//html/RFI/2020-01/msg00060.html (15,488 bytes)
25. Re: [RFI] Quidance on finding noise? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Thu, 9 Jan 2020 19:08:58 -0500; Hi Jim, Not sure who your question was directed to regarding syncing on the line frequency. I have done that before, and about a week and a half ago we used this technique at WB9DKL on a power line a; /archives//html/RFI/2020-01/msg00061.html (17,647 bytes)
26. Re: [RFI] Quidance on finding noise? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Fri, 10 Jan 2020 08:18:18 -0500; Hi Ken, Thanks for the additional 17 second recording with no human voice on top of the noise, and this is what I really needed. I looked at the audio using my 100 MHz digital oscilloscope, I looked; /archives//html/RFI/2020-01/msg00062.html (10,513 bytes)
27. Re: [RFI] Quidance on finding noise? (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Fri, 10 Jan 2020 13:35:59 +0000 (UTC); Don, Toss this into the mix: Three phases times 2 ppc (pulses or strikes per cycle) gives those six 'peaks' seen in the 16.66 ms cycle duration between the cursors in that screen capture. Take a look; /archives//html/RFI/2020-01/msg00063.html (11,016 bytes)
28. Re: [RFI] Quidance on finding noise? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Fri, 10 Jan 2020 08:49:06 -0500; Hi Jim (AA5CT), Yep, I too had 3 phase in the back of my mind when looking at the frequency of the major peaks. Sure will be interesting to see what Ken finds the source to be. Thanks for the comment; /archives//html/RFI/2020-01/msg00064.html (11,529 bytes)
29. Re: [RFI] Quidance on finding noise? (score: 1): Author: Michael Martin <mike@rfiservices.com>; Date: Fri, 10 Jan 2020 08:38:56 -0500; That's good input from Don. Most inside sources are present at 60 and or 120 hertz, whether a sparking source or not. Get BlueMail for Android _______________________________________________ RFI mail; /archives//html/RFI/2020-01/msg00065.html (11,165 bytes)
30. Re: [RFI] Quidance on finding noise? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 10 Jan 2020 14:39:27 -0800; I've repeatedly said to look at the RF spectrum and waterfall. Note that Mike Martin, a pro at this, said that it's not impulse noise. 73, Jim K9YC _______________________________________________ RFI; /archives//html/RFI/2020-01/msg00066.html (9,256 bytes)
31. Re: [RFI] Quidance on finding noise? (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Fri, 10 Jan 2020 23:03:22 +0000 (UTC); Now, in all fairness Jim, he didn't "track that one to ground" did he? A 'strike per half cycle' of a sinusoid is a pretty good indicator of an arc. Not only is that common sense, it falls in line wi; /archives//html/RFI/2020-01/msg00067.html (9,784 bytes)
32. Re: [RFI] Quidance on finding noise? (score: 1): Author: Michael Martin <mike@rfiservices.com>; Date: Fri, 10 Jan 2020 21:28:28 -0500; It is one indication or likeness to a narc. But so is a light dimmer so are many power supplies so are many light bulbs there are many many things the discharge at the peak of every Hive cycle or onc; /archives//html/RFI/2020-01/msg00068.html (10,662 bytes)
33. Re: [RFI] Quidance on finding noise? (score: 1): Author: Michael Martin <mike@rfiservices.com>; Date: Sat, 11 Jan 2020 13:25:50 -0500; Sorry about that guys, I was in a dark place and spell check took advantage of me. Basically, the point I attempted to get across was a noise or rf discharge at every half cycle or every full cycle d; /archives//html/RFI/2020-01/msg00072.html (11,837 bytes)

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