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Total 14 documents matching your query.

1. [RFI] RFI Direction Finding (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 17 Feb 2006 15:40:03 -0500; I am looking for a handheld DF unit capable of reasonable directivity on 40M. I have excessive (+10 dB/S9) power line noise centered near 7 MHz but the noise is not very detectable at VHF/UHF. I real; /archives//html/RFI/2006-02/msg00003.html (7,000 bytes)
2. Re: [RFI] RFI Direction Finding (score: 1): Author: Michael Neverdosky <1twidget@gmail.com>; Date: Fri, 17 Feb 2006 12:27:28 -0900; A small shielded loop, with/without a sense antenna would work. If you have an AM receiver for VHF and a small beam that you can carry you can try a survey of the power lines to see if you can find i; /archives//html/RFI/2006-02/msg00004.html (7,135 bytes)
3. Re: [RFI] RFI Direction Finding (score: 1): Author: "Cortland Richmond" <ka5s@earthlink.net>; Date: Fri, 17 Feb 2006 16:24:00 -0800; Yes, do try a small shielded loop. Here's one design that works fine on my VR-500 receiver: http://people.delphiforums.com/KA5S/the%20coax%20loop.JPG It can be made with three or four RS parts (as lo; /archives//html/RFI/2006-02/msg00005.html (8,764 bytes)
4. Re: [RFI] RFI Direction Finding (score: 1): Author: "Ed -K0iL" <eedwards@tconl.com>; Date: Fri, 17 Feb 2006 20:18:52 -0600; The fact that you cannot rcv it at VHF indicates the source is some distance away from your station. It's either being conducted via lines to your vicinity or it's just far enough away to be out-of-r; /archives//html/RFI/2006-02/msg00006.html (8,907 bytes)
5. Re: [RFI] RFI Direction Finding (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 17 Feb 2006 21:13:06 -0500; directivity on centered near 7 MHz but the gain will be low establish good or mobile mounted? I have a Sprague battery operated portable system with LF loops and VHF/UHF yagi antenna for tracking po; /archives//html/RFI/2006-02/msg00007.html (7,996 bytes)
6. Re: [RFI] RFI Direction Finding (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Fri, 17 Feb 2006 20:58:35 -0600; For MW and HF DFing I use a AM/FM/SW Sears portable radio (we're talking a beast that takes 4- D cells here) that uses a long internal ferrite loopstick for the AM Broadcast and 2 - 6 MHZ SW bands. T; /archives//html/RFI/2006-02/msg00008.html (10,252 bytes)
7. Re: [RFI] RFI Direction Finding (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Fri, 17 Feb 2006 23:03:22 -0600; distance This assumes that the source is flat from HF through VHF. This isn't always the case. The WORST source ever in my area affected another ham a mile north or so of me who went out DRIVING with; /archives//html/RFI/2006-02/msg00009.html (9,134 bytes)
8. Re: [RFI] RFI Direction Finding (score: 1): Author: "Ed -K0iL" <eedwards@tconl.com>; Date: Sat, 18 Feb 2006 08:33:49 -0600; No, it does not make that assumption at all. Not sure where you got that from. It makes the assumption that the noise travels FARTHER from the source on lower freqs than at higher freqs. You must be; /archives//html/RFI/2006-02/msg00010.html (8,455 bytes)
9. Re: [RFI] RFI Direction Finding (score: 1): Author: "Ed -K0iL" <eedwards@tconl.com>; Date: Sat, 18 Feb 2006 08:50:00 -0600; The FM broadcast wouldn't be affect on an FM radio since noise is "Amplitude" in nature. FM rcvrs won't pick them up (usually, although some rcvrs may). Most powerline noise sources, when you are in; /archives//html/RFI/2006-02/msg00011.html (9,011 bytes)
10. Re: [RFI] RFI Direction Finding (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Sat, 18 Feb 2006 10:12:14 -0600; some Bzzzzt! Not these cheap ratio-detector equipped FM radios with only 4 transistor IF stages - which I used to check this phenom (these radios aren't equipped with a full set of 'limiter' stages f; /archives//html/RFI/2006-02/msg00012.html (13,689 bytes)
11. Re: [RFI] RFI Direction Finding (score: 1): Author: "Ed -K0iL" <eedwards@tconl.com>; Date: Sat, 18 Feb 2006 12:29:15 -0600; Jim, This has drifted far off from where the original question was, which was how to make/use a loop on 40 mtrs to track noise. I was simply giving some "general" guidelines from my experience and th; /archives//html/RFI/2006-02/msg00013.html (11,593 bytes)
12. Re: [RFI] RFI Direction Finding (score: 1): Author: "Donald Chester" <k4kyv@hotmail.com>; Date: Sat, 18 Feb 2006 22:00:30 +0000; I bought a $30 Radio Shack VHF aircraft radio receiver for the purpose. It is AM, not FM, and works very well. I can track noise down to the exact pole. But the problem I have is travelling along th; /archives//html/RFI/2006-02/msg00014.html (8,671 bytes)
13. Re: [RFI] RFI Direction Finding (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Sun, 19 Feb 2006 09:41:13 -0600; Sorry to have been so pedantic, Ed. In my drive to be thorough, complete, cover every aspect including supplying the easiest answer I could give ("seek out and make use of a portable SW radio utilizi; /archives//html/RFI/2006-02/msg00015.html (16,367 bytes)
14. Re: [RFI] RFI Direction Finding (score: 1): Author: "Jim P" <jvpoll@dallas.net>; Date: Sun, 19 Feb 2006 10:06:44 -0600; Don, I have found that mobile 'trouble shooting' of the power grid from a car is limited by the vehicle ignition systems too. Peak reading instrumentation (peak amplitude reading receivers) quite nic; /archives//html/RFI/2006-02/msg00016.html (10,619 bytes)

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