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1. [RFI] What antennas are good for HF DFing? (score: 1): Author: "Frank N. Haas" <kb4t@arrl.net>; Date: Sat, 12 Feb 2005 22:18:59 -0500; Dear RFI List: I find myself spending a great deal of time attempting to locate interference in the range of 500 KHz to 8 MHz. Most of these signals originate from switching power supplies or electro; /archives//html/RFI/2005-02/msg00059.html (7,892 bytes)
2. Re: [RFI] RFI Detector? (score: 1): Author: "Frank N. Haas" <kb4t@arrl.net>; Date: Mon, 03 Oct 2005 22:15:20 +0000; Fellow RFI'ers: I am a Communications Specialist and Interference Investigator for a large electric utility. The company provides me with very esoteric and expensive tools specifically designed to lo; /archives//html/RFI/2005-10/msg00008.html (14,494 bytes)
3. Re: [RFI] New Noise (score: 1): Author: "Frank N. Haas" <kb4t@arrl.net>; Date: Thu, 13 Oct 2005 05:40:14 +0000; Henry: If you can hear the noise during the day on 80 meters, I would be inclined to think that the source is within the same town. I would think that it would be easier to locate during the day when; /archives//html/RFI/2005-10/msg00025.html (7,411 bytes)
4. Re: [RFI] Electric Company Problem (score: 1): Author: "Frank N. Haas" <kb4t@arrl.net>; Date: Tue, 13 Dec 2005 07:08:01 +0000; Fellow RFI'ers: I am an Interference Investigator for a large electric utility. I've been reading this thread with interest as it directly relates to my profession. One fellow early on in the thread; /archives//html/RFI/2005-12/msg00049.html (13,453 bytes)
5. [RFI] Pride Mobility Scooter Battery Charger RFI (score: 1): Author: Frank Haas <kb4t@arrl.net>; Date: Sun, 22 Apr 2007 21:19:11 -0400; Fellow RFI folk: I walked into the shack this morning and started listening on 30 meters. A familiar and unpleasant sound emanated from the speaker. As I tuned across the band I could hear the swept; /archives//html/RFI/2007-04/msg00021.html (14,051 bytes)
6. [RFI] Noise is everywhere (was Solar Arrays) (score: 1): Author: "Frank N. Haas" <kb4t@arrl.net>; Date: Thu, 10 May 2007 04:33:46 +0000; Take any portable AM/FM/SW receiver, tune it to a fairly quiet spot on the AM Broadcast band and pass it near any microprocessor-equipped device, vacuum flourescent digital display-equipped device or; /archives//html/RFI/2007-05/msg00007.html (8,919 bytes)
7. [RFI] Alarm Systems and EMI/EMC (score: 1): Author: "Frank Haas KB4T" <kb4t@arrl.net>; Date: Sun, 10 May 2009 10:05:45 -0400; I am an Interference Investigator for a large electric utility in Florida. This thread reminded me about an interesting case I investigated a couple of years ago. The customer reported that key fobs/; /archives//html/RFI/2009-05/msg00020.html (10,127 bytes)
8. Re: [RFI] Looking for ideas about yet another noise source (score: 1): Author: "Frank Haas KB4T" <kb4t@arrl.net>; Date: Sun, 12 Jul 2009 17:22:32 -0400; Chris: The random nature of your pulsing interference means you will have to invest more time to find the source. It's not going to be easy and will likely be very time consuming because of its inter; /archives//html/RFI/2009-07/msg00005.html (11,402 bytes)
9. [RFI] I will have you arrested (score: 1): Author: "Frank Haas KB4T" <kb4t@arrl.net>; Date: Tue, 9 Feb 2010 17:31:14 -0500; I am an interference investigator for a large electric utility in Florida. If I see someone hitting a power pole with a sledge hammer (or anything else) I call the police and have that person arreste; /archives//html/RFI/2010-02/msg00012.html (12,563 bytes)
10. Re: [RFI] I will have you arrested (score: 1): Author: "Frank Haas KB4T" <kb4t@arrl.net>; Date: Wed, 10 Feb 2010 02:38:54 -0500; I can only speak to what happens in Florida but I suspect the process is more or less the same in most states. The first step is to contact the utility's customer care call center and request an inte; /archives//html/RFI/2010-02/msg00018.html (13,635 bytes)
11. Re: [RFI] 12 meter QRM - please help identify (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Fri, 12 Feb 2010 17:06:54 -0500; Kirk: Any number of things could be causing the interference you recorded. I presume this occurs continuously. If so, it should be fairly easy to locate. Grab the battery-operated receiver with a sig; /archives//html/RFI/2010-02/msg00064.html (11,198 bytes)
12. Re: [RFI] Frustrating White Noise (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Fri, 19 Feb 2010 15:34:29 -0500; "Gentle Readers??? Here???? Over what portion of the spectrum does the noise appear to be copyable? At what frequencies does its signal strength seem to peak? Take a portable receiver with a signal s; /archives//html/RFI/2010-02/msg00105.html (8,850 bytes)
13. Re: [RFI] 30m noise problem (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Thu, 22 Apr 2010 15:56:31 -0400; I had exactly the same problem. My source turned out to be the switching power supply that powered the battery charger in my next door neighbor's mobility scooter or power chair. I used a simple AM/F; /archives//html/RFI/2010-04/msg00051.html (11,119 bytes)
14. Re: [RFI] RFI Digest, Vol 96, Issue 3 (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Sun, 2 Jan 2011 21:03:37 -0500; Grow lights may indeed be the #1 source of ham RFI complaints received by the ARRL. But all RFI issues endured by Hams are not reported to the League. As an Interference Investigator for a large elec; /archives//html/RFI/2011-01/msg00027.html (8,818 bytes)
15. Re: [RFI] distance to rfi source? (score: 1): Author: "Frank Haas KB4T" <kb4t@arrl.net>; Date: Fri, 7 Jan 2011 00:29:28 -0500; I am an Interference Investigator for an electric utility in Florida. Others on this list have more experience than I do and I have no argument with statements made here on this topic. I will share m; /archives//html/RFI/2011-01/msg00074.html (12,559 bytes)
16. [RFI] HF DF Antenna recommendations (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Mon, 17 Jan 2011 21:17:45 -0500; As some of you know, I am an interference investigator for a large Florida electric utility. I am fortunate that my employer has provided me with the best tools available to locate and pinpoint real; /archives//html/RFI/2011-01/msg00159.html (8,710 bytes)
17. Re: [RFI] HF DF Antenna recommendations (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Thu, 20 Jan 2011 19:08:29 -0500; I want to thank everyone who wrote me both publicly on this list and privately with suggestions and comments on this subject. I have been reviewing literature for about a dozen different loop style a; /archives//html/RFI/2011-01/msg00171.html (11,340 bytes)
18. Re: [RFI] HF DF Antenna recommendations (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Thu, 20 Jan 2011 21:49:08 -0500; The National RF HF DF products do not cover the spectrum between 2 and 8 MHz. I spoke with the engineer at National RF about the 80 meter band. He told me that they had started working on a loop for; /archives//html/RFI/2011-01/msg00174.html (10,159 bytes)
19. Re: [RFI] MFJ-805 RFI detector - Any good? (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Wed, 9 Mar 2011 16:29:01 -0500; Save your money. Remember...it's made by MFJ. If you are searching for real power line noise, consider using a handheld receiver/transceiver with wideband coverage and a 3 to 5 element yagi and a pie; /archives//html/RFI/2011-03/msg00018.html (8,856 bytes)
20. [RFI] National RF HFDF Vector Gun now in hand (score: 1): Author: "Frank N. Haas KB4T" <kb4t@arrl.net>; Date: Wed, 9 Mar 2011 17:29:38 -0500; Back in January I solicited recommendations for DFing antennas that work well down to 3 MHz. There simply isn't much to choose from. I discovered through Internet searching that NationalRF.com offers; /archives//html/RFI/2011-03/msg00020.html (11,776 bytes)

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