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21. [RFI] Noise Canceller vs DSP filter (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 21 Oct 2002 15:23:57 -0500; The lower you go in frequency the less the distance between your ant. and the lines has a preventive effect. Also, at lower frequencies, you start rxing noise standing waves on the power lines. -- Wh; /archives//html/RFI/2002-10/msg00036.html (9,119 bytes)
22. [RFI] LED Traffic Light RFI (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Fri, 27 Sep 2002 14:37:44 -0500; YES! I posted a similar question here last Dec. We started having problems with these LED lights in Omaha, NE last year, and the traffic engineer laughed at first when I called to let them know about; /archives//html/RFI/2002-09/msg00017.html (8,813 bytes)
23. [RFI] Computer RFI problem (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 6 Aug 2002 08:29:59 -0500; This makes the most sense to me as well. As long as the antenna system is properly grounded (RF & safety-wise) and the shack has a proper single-point ground system, then messing around at the anten; /archives//html/RFI/2002-08/msg00011.html (9,940 bytes)
24. [RFI] Computer RFI problem (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 6 Aug 2002 14:49:23 -0500; Rob, This is exactly the way we have mounted 7 out of 9 of our 800 Mhz colinear verticals on our 500 foot towers here in Nebraska. The reason? Lightning protection/suppression. Before I came along a; /archives//html/RFI/2002-08/msg00015.html (10,047 bytes)
25. [RFI] Electric meter RFI (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 19 Aug 2002 09:23:23 -0500; I'm curious--Who makes it? You could contact the manufacturer to let them know, but I'd let the power company know about it for sure. Could be that it's improperly installed. If so, it might be an e; /archives//html/RFI/2002-08/msg00039.html (6,954 bytes)
26. [RFI] Nighthawk CO2 Detector (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 19 Aug 2002 09:34:08 -0500; If the signal is coupled to the line in differential mode, then this might work although in in-line coil would work better; but usually it's induced common mode onto the line. If it's common mode, t; /archives//html/RFI/2002-08/msg00040.html (8,057 bytes)
27. [RFI] Broad band Cable Modem (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 4 Jun 2002 08:58:58 -0500; I don't have much experience with these, but I'm guessing the AC power wall wart that most of these use needs a ferrite choke on the line feeding power to the modem. If that doesn't dure it, also try; /archives//html/RFI/2002-06/msg00012.html (8,144 bytes)
28. [RFI] Locating Noise - Radiated or Conducted and then radiated (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 4 Jun 2002 09:16:39 -0500; The only way I know of to know for sure if the noise is direct radiation or re-radiation of conducted noise is to use an ultrasonic detector to test for direct noise. You'll only pick up noise from a; /archives//html/RFI/2002-06/msg00013.html (12,937 bytes)
29. [RFI] M&S Systems intercom RFI where to start (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 4 Jun 2002 11:31:19 -0500; Rob, I'll have to disagree with a slight disclaimer: If RF is coming into the unit VIA the external cabling and then getting rectified or "detected" internally, then the ferrite chokes will probably; /archives//html/RFI/2002-06/msg00014.html (7,729 bytes)
30. [RFI] A RFI NPRM? (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 16 Apr 2002 09:22:41 -0500; Thought this looked interesting: Notice of Proposed Rule Making (NPRM) Establishment of Rules Governing Procedures To Be Followed When Informal Complaints Are Filed by Consumers Against Entities Regu; /archives//html/RFI/2002-04/msg00010.html (6,890 bytes)
31. [RFI] Power line RFI situation (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 18 Mar 2002 16:23:28 -0600; Step one for the City: "Give the brush-off and see if they give up and go away." This is going to be the first hurdle to overcome once you've found the noisey poles for them. Was the young man also; /archives//html/RFI/2002-03/msg00036.html (10,815 bytes)
32. [RFI] Ultrasonic receivers (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Thu, 21 Mar 2002 09:09:56 -0600; Hi Rob, Yes, we use an Ultrasonic parabolic detector (UltraProbe 2000) here at work to confirm noisy power poles and determine what exact piece hardware is causing the noise. They're also used in ot; /archives//html/RFI/2002-03/msg00045.html (9,221 bytes)
33. [RFI] Ultrasonic detect. (was: Power line RFI situation) (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Fri, 22 Mar 2002 08:54:20 -0600; Yes, please post your findings on K2QAI's testing the unit as well. If it makes the grade in the ARRL labs then I'd consider budgeting one for our ham club as a loaner. Rob, was that for the UE Syst; /archives//html/RFI/2002-03/msg00048.html (7,878 bytes)
34. [RFI] Neon Light Interference (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Wed, 13 Feb 2002 09:11:45 -0600; Hi Stephanie, There are a couple of things you should try. First, have you had the local power company involved at any stage during the noise search? (your story sounds familiar so if I've already sa; /archives//html/RFI/2002-02/msg00015.html (12,587 bytes)
35. [RFI] Fwd: 800 MHZ system jamming/interference (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Tue, 26 Feb 2002 08:48:39 -0600; FYi: Hams aren't the only ones with strange interference issues. Here's a couple in the 800 band some of you might be interested in and may affect the 902 band. 73, de ed -K0iL [Editors Note: Followi; /archives//html/RFI/2002-02/msg00022.html (11,702 bytes)
36. [RFI] Noise sniffer article in QST - WW3S (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Thu, 24 Jan 2002 09:11:59 -0600; Leon's mention of using a hand-held yagi is right on the mark. It's the only way to hunt PL-noise that is "Conducted" along the line because of Standing Waves along the line. We use the Oak unit here; /archives//html/RFI/2002-01/msg00010.html (12,556 bytes)
37. [RFI] phones (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 10 Dec 2001 09:06:27 -0600; Dick, Here ya go! Listed in the ARRL's RFI Book & Web site: The two who make the phones with built-in filtering are: 1) From RFI Book: PRO Distributors 2811-B 74th St. Lubbock, TX 79423 (800) 658-202; /archives//html/RFI/2001-12/msg00023.html (7,465 bytes)
38. [RFI] Low Power 10M RFI! (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 17 Dec 2001 09:14:55 -0600; Interesting story Jon. First, I keep the ARRL pamphlets on hand at all times for just such situations when they come up. Second, if one neighbor tells me that other neighbors are "hearing" me on thei; /archives//html/RFI/2001-12/msg00035.html (11,545 bytes)
39. [RFI] Interfacing to sound card RFI (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Mon, 26 Nov 2001 11:33:29 -0600; I have a question on this. I'm sort of thinking out loud here. Are you trying to reduce distributed capacitance of the coil or increase it? First, by winding the coil "closewound" you would be increa; /archives//html/RFI/2001-11/msg00021.html (10,831 bytes)
40. [RFI] ARRLWeb Psychoanalyze Your Neurotic Touch Lamps (score: 1): Author: eedwards@oppd.com (EDWARDS, EDDIE J); Date: Fri, 19 Oct 2001 10:54:10 -0500; A new article about Touch Lamp RFI. Interesting thing at the bottom: Apparently a manufacturer is making an light dimmer with RFI Suppression! Here's exactly what we need. If you are in need of such; /archives//html/RFI/2001-10/msg00005.html (6,955 bytes)

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