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Total 29 documents matching your query.

21. Re: [RFI] Guidance on finding noise? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 12 Jan 2020 23:12:40 -0600; With any kind of direction finding antenna, you have to be aware of polarization. A vertically polarized loop, for example, may give very misleading bearings if the noise happens to be mostly horizon; /archives//html/RFI/2020-01/msg00095.html (12,436 bytes)
22. Re: [RFI] Guidance on finding noise? (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Mon, 13 Jan 2020 11:51:03 +0000 (UTC); Scott, The marine DF receiver (with the "sense" antenna to give a cardioid pattern) in use by myself (and a few others) covers the old "marine" band as shown on the scale as 1.6 MHz through 4.0 MHz a; /archives//html/RFI/2020-01/msg00096.html (15,556 bytes)
23. Re: [RFI] Guidance on finding noise? (score: 1): Author: Michael Martin <mike@rfiservices.com>; Date: Mon, 13 Jan 2020 07:52:07 -0500; Hey Scott, The next time you DF a power line noise pay close attention to your distance away from the pole. By moving back and forth, a half a wavelength of the freq you're using, you'll notice you c; /archives//html/RFI/2020-01/msg00097.html (14,865 bytes)
24. Re: [RFI] Guidance on finding noise? (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 13 Jan 2020 08:24:38 -0800; A couple of comments: I just bought ($25) a Marine DF, with BFO, 3 bands 0.15 to 5MHz, & VHF FM, has D battery as well as 12v. Optical sights, S meter, sense antenna as well! Pretty good RFI DF I thi; /archives//html/RFI/2020-01/msg00098.html (16,004 bytes)
25. Re: [RFI] Guidance on finding noise? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 13 Jan 2020 10:25:02 -0800; YES! Any noise generated on the pole (like an arc on something at the top) will produce current on that ground wire, and the ground wire will radiate it. 73, Jim K9YC ________________________________; /archives//html/RFI/2020-01/msg00099.html (9,354 bytes)
26. Re: [RFI] Guidance on finding noise? (score: 1): Author: Alan Higbie <alan.higbie@gmail.com>; Date: Mon, 13 Jan 2020 22:01:36 -0700; Just to keep this thread going . . . In addition to all the great ideas already posted, you might also consider: (1) Validate the directivity of the DF loop you are using. Generate a small signal on; /archives//html/RFI/2020-01/msg00100.html (10,709 bytes)
27. Re: [RFI] Guidance on finding noise? (score: 1): Author: Don Moman VE6JY <ve6jy.1@gmail.com>; Date: Tue, 14 Jan 2020 05:31:51 +0000; Don't overlook the situation of a micro arc inside the transformer can. These (in my experience) have a very strong low frequency component with little high frequency energy. They are a bear to pin d; /archives//html/RFI/2020-01/msg00101.html (12,863 bytes)
28. Re: [RFI] Guidance on finding noise? (score: 1): Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>; Date: Tue, 14 Jan 2020 15:23:36 +0000; Alan, Question when disconnecting all antennas: Disconnect at the antenna feed point? All antennas or just the ones for bands affected? May be a challenge for those with towers who don't climb it the; /archives//html/RFI/2020-01/msg00102.html (9,932 bytes)
29. Re: [RFI] Guidance on finding noise? (score: 1): Author: Alan Higbie <alan.higbie@gmail.com>; Date: Tue, 14 Jan 2020 08:59:15 -0700; Ed ~ beam, I RFI sniffed around another antenna feed line (coax) from a separate 40 meter beam. I was astounded to see how much hash was present on the 40 meter coax. I don't know exactly what was ge; /archives//html/RFI/2020-01/msg00103.html (10,803 bytes)

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