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Total 19 documents matching your query.

1. [RFI] Portable DFing at HF (score: 1): Author: Kelly Johnson <kelly@kellyandshari.com>; Date: Thu, 11 Aug 2016 13:57:17 -0700; I am trying to locate a new source of RFI in my neighborhood. I can get a decent direction in it from my yagi, but would like to DF it from another direction to pinpoint the source. I don't know if I; /archives//html/RFI/2016-08/msg00073.html (6,530 bytes)
2. Re: [RFI] Portable DFing at HF (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 11 Aug 2016 16:26:07 -0700; What kind of noise is it, Kelly? Impulse noise from a power system, or electronically generated? In general, impulse noise is best DFed at the highest frequency where you can hear it, often up to 440; /archives//html/RFI/2016-08/msg00074.html (8,139 bytes)
3. Re: [RFI] Portable DFing at HF (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Thu, 11 Aug 2016 17:36:37 -0700; I use small loops, for receive... They work very well, and if you can hear the source you can more than likely DF it. See: http://www.w8ji.com/magnetic_receiving_loops.htm If you are lazy, you can b; /archives//html/RFI/2016-08/msg00075.html (7,473 bytes)
4. Re: [RFI] Portable DFing at HF (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Thu, 11 Aug 2016 21:24:05 -0700; I DF up to 950 MHz for two reasons. One, small directional antennas, two, they usually aren't needed because as the frequency goes up, the distance goes down and you can usually narrow a source to a; /archives//html/RFI/2016-08/msg00076.html (7,240 bytes)
5. Re: [RFI] Portable DFing at HF (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 12 Aug 2016 07:29:31 -0600; Kelly, http://tomthompson.com/radio/ReceivingLoop/loop.html 73, Tom W0IVJ On 8/11/2016 2:57 PM, Kelly Johnson wrote: I am trying to locate a new source of RFI in my neighborhood. I can get a decent d; /archives//html/RFI/2016-08/msg00077.html (7,768 bytes)
6. Re: [RFI] Portable DFing at HF (score: 1): Author: Cortland Richmond <ka5s@earthlink.net>; Date: Fri, 12 Aug 2016 10:35:03 -0400; On 8/11/2016 1:57 PM, Kelly Johnson wrote: I can get a decent direction in it from my yagi, but would like to DF it from another direction to pinpoint the source. I don't know if I can DF it at VHF o; /archives//html/RFI/2016-08/msg00079.html (7,887 bytes)
7. Re: [RFI] Portable DFing at HF (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 12 Aug 2016 10:56:40 -0700; In off-list email, Kelly has said he thinks is noise is from a grow operation, so I think he has to DF it on the HF band(s) where he hears it. That means loop, so something like what W0IVJ has posted; /archives//html/RFI/2016-08/msg00083.html (9,029 bytes)
8. Re: [RFI] Portable DFing at HF (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 12 Aug 2016 12:09:48 -0600; Kelly and all, My experience has been that local HF RFI is almost always vertically polarized unless you are very very close to it. This means that the null is looking through the loop. My last RFI h; /archives//html/RFI/2016-08/msg00085.html (10,990 bytes)
9. Re: [RFI] Portable DFing at HF (score: 1): Author: Kelly Johnson <kelly@kellyandshari.com>; Date: Fri, 12 Aug 2016 12:42:07 -0700; I've located the source of HF interference in the past by getting a beam heading with my 20m yagi, then walking that direction with an FT-817 tuned to 50MHz. For powerline noise, I then pull out a po; /archives//html/RFI/2016-08/msg00091.html (12,472 bytes)
10. Re: [RFI] Portable DFing at HF (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 12 Aug 2016 14:16:09 -0600; Kelly, I can easily hear an S-7 noise on my 40m dipole at 700 feet with my AL loop. With the larger CU loop I can hear even further or weaker RFI. Tom W0IVJ On 8/12/2016 1:42 PM, Kelly Johnson wrote:; /archives//html/RFI/2016-08/msg00092.html (13,410 bytes)
11. Re: [RFI] Portable DFing at HF (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Fri, 12 Aug 2016 22:11:06 -0700; Just did a locate yesterday for a friend... He is a new ham, just got his gear in place, and RFI at 20 over S9... Used a single three element yagi at 135 MHz AM. Five minutes later it was pinned do; /archives//html/RFI/2016-08/msg00095.html (9,409 bytes)
12. Re: [RFI] Portable DFing at HF (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Fri, 12 Aug 2016 22:23:10 -0700; Perhaps that's where he noticed it. I hear 60 Hz powr line arcing harmonics to 2.3 GHz at one messy location and no doubt goes higher in some cases. Since he can't easily DF at HF, listen higher, wh; /archives//html/RFI/2016-08/msg00097.html (10,079 bytes)
13. Re: [RFI] Portable DFing at HF (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Fri, 12 Aug 2016 22:27:21 -0700; What do you do now? Approach the grower who probably knows nothing of or cares about RFI? Play cop? Play fed? Ignore it and hope it goes away? Kurt _______________________________________________ RF; /archives//html/RFI/2016-08/msg00098.html (8,579 bytes)
14. Re: [RFI] Portable DFing at HF (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Sat, 13 Aug 2016 07:32:56 -0700; The new ham is going to try one of those MFJ 1025 first, that may help, as the RFI looks like direct radiation from the location, as opposed to being conduction into the power grid. Looking at the p; /archives//html/RFI/2016-08/msg00100.html (11,900 bytes)
15. Re: [RFI] Portable DFing at HF (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Sat, 13 Aug 2016 18:09:27 -0700; Now that is VERY exciting news! Around here, if someone finds an overly large bag of weed during a "routine" traffic stop, the Sheriff comes in, they call SWAT, ATF, and the DEA. I always wondered w; /archives//html/RFI/2016-08/msg00103.html (9,265 bytes)
16. Re: [RFI] Portable DFing at HF (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Sat, 13 Aug 2016 19:44:20 -0700; Hi Kurt, Respectfully, I must disagree with you here. I think that is absolutely the wrong way to handle this issue. The Amateur Operator involved has a family. That family could be put in actual,; /archives//html/RFI/2016-08/msg00104.html (12,908 bytes)
17. Re: [RFI] Portable DFing at HF (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 13 Aug 2016 21:06:45 -0700; I also agree that what Kurt is suggesting is absolutely the wrong approach. And I also believe that it's wrong to assume that the grower is a "bad guy." Some may be, but many may not. I've known some; /archives//html/RFI/2016-08/msg00105.html (12,054 bytes)
18. Re: [RFI] Portable DFing at HF (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Sun, 14 Aug 2016 01:00:06 -0700; Yeah... Someone calls the ANONYMOUS tip line, a friend of a friend of a friend from out of town using a barrowed phone and fake name, just to have someone in a position to do so POLITELY check on it; /archives//html/RFI/2016-08/msg00106.html (11,321 bytes)
19. Re: [RFI] Portable DFing at HF (score: 1): Author: "David Robbins" <k1ttt@arrl.net>; Date: Sun, 14 Aug 2016 10:48:16 +0000; I agree, its always best to approach the person, unless maybe they have a 10' fence with barbed wire on it and a nasty dog inside, of course. An important foot-in-the-door tactic is the warning that; /archives//html/RFI/2016-08/msg00107.html (13,136 bytes)

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