Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+DFing\s+intermittent\s+connection\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+DFing\s+intermittent\s+connection\s*$/: 37 ]

Total 37 documents matching your query.

1. [RFI] DFing intermittent connection (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 8 Aug 2021 13:18:31 -0600; This is a little off topic from the usual, but the expertise in DFing on this forum is outstanding. I am a serious contester, and do lots of SO2R. That means I need to be able to listen on one band w; /archives//html/RFI/2021-08/msg00014.html (8,021 bytes)
2. Re: [RFI] DFing intermittent connection (score: 1): Author: Stephanie WX3K via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 15:28:31 -0400; Difficult to use something that selective on HF. I do a lot of PIM troubleshooting on DAS and the BEST method i find is tapping connections/hardware with a rubber mallet while the systems is active.; /archives//html/RFI/2021-08/msg00015.html (9,168 bytes)
3. Re: [RFI] DFing intermittent connection (score: 1): Author: Stephanie WX3K via RFI <rfi@contesting.com>; Date: Sun, 8 Aug 2021 15:41:18 -0400; DAS - Distributed Antenna systems used in major airport/commercial to redistribute cellular service PIM - Passive Intermodulation, usually caused by the rusty(ferrous) connection that will cause IM p; /archives//html/RFI/2021-08/msg00016.html (10,829 bytes)
4. Re: [RFI] DFing intermittent connection (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 15:48:00 -0400; I would go up with a long pole (preferably fiberglass or some other insulator) and start whacking things to see if you can stimulate it. Also pull and push on all the cables, check that connections a; /archives//html/RFI/2021-08/msg00017.html (9,538 bytes)
5. Re: [RFI] DFing intermittent connection (score: 1): Author: donovanf@erols.com; Date: Sun, 8 Aug 2021 17:24:22 -0400 (EDT); Hi Steve, Does the RFI affect only one antenna on receive or multiple antennas? Suggest you have someone visit your shack and listen on the harmonic frequency and observe your spectrum display on the; /archives//html/RFI/2021-08/msg00018.html (11,117 bytes)
6. Re: [RFI] DFing intermittent connection (score: 1): Author: Gary Johnson <gwj@wb9jps.com>; Date: Sun, 8 Aug 2021 14:41:21 -0700; Bonding of the mast to the tower has been mentioned in the past. Thrust bearings and rotators are not necessarily great electrical commutators. Since those connections are near the most intense RF fi; /archives//html/RFI/2021-08/msg00019.html (8,269 bytes)
7. Re: [RFI] DFing intermittent connection (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 9 Aug 2021 14:54:49 -0600; Thanks for all the suggestions. Unfortunately, magic DFing equipment for HF must not exist, or someone would have suggested it. There are a lot of things it could be. To narrow it down, I would have; /archives//html/RFI/2021-08/msg00021.html (12,779 bytes)
8. Re: [RFI] DFing intermittent connection (score: 1): Author: donovanf@erols.com; Date: Mon, 9 Aug 2021 17:25:58 -0400 (EDT); Hi Steve, Do you hear this RFI on every antenna? Does it occur on only one transmitting antenna? Small "magnetic loops" are excellent for local DFing and you can build one in about an hour 73 Frank W; /archives//html/RFI/2021-08/msg00022.html (13,507 bytes)
9. Re: [RFI] DFing intermittent connection (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 11 Aug 2021 12:26:31 -0600; I would like to thank everyone for their helpful suggestions. It's nice to have a name for this: PIM (passive intermod). With the help of my wife providing feedback listening in the shack, I have don; /archives//html/RFI/2021-08/msg00031.html (10,179 bytes)
10. Re: [RFI] DFing intermittent connection (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 11 Aug 2021 11:35:31 -0700; W3LPL was the first to alert me to this mechanism as a cause of harmonics, with rotators as a common place on towers where it occurs. The fix is to bond around it. He also observed that it commonly o; /archives//html/RFI/2021-08/msg00033.html (8,586 bytes)
11. Re: [RFI] DFing intermittent connection (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Wed, 11 Aug 2021 19:21:05 +0000 (UTC); "Materials too far apart in the Galvanic Series." This means no steel against Aluminum (or brass in my experience). There used to be a nice little chart/diagram in the old DB Products catalog (land m; /archives//html/RFI/2021-08/msg00034.html (10,082 bytes)
12. Re: [RFI] DFing intermittent connection (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 11 Aug 2021 16:05:06 -0500; Back when I first got back on the air, lots of neighbors used "rabbit ear" antennas for TV. After much investigation, it became clear that they were picking up harmonics from every metal on metal con; /archives//html/RFI/2021-08/msg00037.html (11,358 bytes)
13. Re: [RFI] DFing intermittent connection (score: 1): Author: jimk8mr--- via RFI <rfi@contesting.com>; Date: Mon, 16 Aug 2021 01:07:47 +0000 (UTC); You might look into DX Engineering's Bearing Bypass Ground Kits DXE-BBGK-2-25-P. I installed one yesterday for K8AZ. I'm not sure if Tom had a particular problem or it was just as a precaution. It ea; /archives//html/RFI/2021-08/msg00060.html (11,601 bytes)
14. Re: [RFI] DFing intermittent connection (score: 1): Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>; Date: Mon, 16 Aug 2021 13:09:22 +0000; Just FYi...They told me they only have the bypass kits for standard Rohn towers, but not for the BX or HDBX series towers. Need to make your own for other non-rohn configurations. 73, de ed -K0iL You; /archives//html/RFI/2021-08/msg00061.html (9,165 bytes)
15. Re: [RFI] DFing intermittent connection (score: 1): Author: jimk8mr--- via RFI <rfi@contesting.com>; Date: Mon, 16 Aug 2021 14:26:45 +0000 (UTC); The kit is basically a very heavy, very flexible cable, six feet or so, with lugs on both ends, and clamps with a large flat surface to attach to the mast and to the tower leg. I'd think that the bot; /archives//html/RFI/2021-08/msg00062.html (10,186 bytes)
16. Re: [RFI] DFing intermittent connection (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 16 Aug 2021 11:30:35 -0500; Or just use the braid from some RG8 and a couple hose clamps. -- Scott Ellington. K9MA -- via iPhone _______________________________________________ RFI mailing list RFI@contesting.com http://lists.c; /archives//html/RFI/2021-08/msg00063.html (10,576 bytes)
17. Re: [RFI] DFing intermittent connection (score: 1): Author: "Tim Duffy" <k3lr@k3lr.com>; Date: Mon, 16 Aug 2021 13:02:11 -0400; Hi Scott, I am afraid that won't last very long as exposed copper braid will wick water, turn black and then fail unprotected and it is hard to waterproof. Even tinned copper braid is not recommended; /archives//html/RFI/2021-08/msg00064.html (11,970 bytes)
18. Re: [RFI] DFing intermittent connection (score: 1): Author: KD7JYK DM09 <kd7jyk@earthlink.net>; Date: Mon, 16 Aug 2021 10:31:02 -0700; That is why DXE uses 1AWG insulated heavy wire for their bypass kit I've been playing with lightning protection lately. The industry uses very heavy woven wire rope, lugs, clamps, brackets, and relat; /archives//html/RFI/2021-08/msg00065.html (9,072 bytes)
19. Re: [RFI] DFing intermittent connection (score: 1): Author: donovanf@erols.com; Date: Mon, 16 Aug 2021 13:32:12 -0400 (EDT); Jim, Please ignore Scott's advice, it will cause tower corrosion and quickly fail 73 Frank W3LPL -- Original Message -- Or just use the braid from some RG8 and a couple hose clamps. -- Scott Ellingto; /archives//html/RFI/2021-08/msg00066.html (11,322 bytes)
20. Re: [RFI] DFing intermittent connection (score: 1): Author: D C _Mac_ Macdonald <k2gkk@hotmail.com>; Date: Mon, 16 Aug 2021 18:01:39 +0000; My tower is a Universal with 18" top section enough alike Rohn 45G that the work platform for 45G fits fine. I use a Rohn thrust bearing with Fernco boot above the bearing to keep rain/sleet/snow/ice; /archives//html/RFI/2021-08/msg00068.html (16,315 bytes)

Current List: 1 - 20
Page: [1] [2]