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Total 17 documents matching your query.

1. [RFI] RFI Question (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Sun, 24 Jun 2012 20:32:34 -0700; Hi, I have a question for all you RFI folks... I found a Cable Line Amp which is putting out Ultrasonic sounds, but no detectable RF on 125 MHz... Is this normal? It is a trunk amp hanging from the c; /archives//html/RFI/2012-06/msg00043.html (8,220 bytes)
2. [RFI] RFI question (score: 1): Author: "Kenneth G. Gordon" <kgordon2006@frontier.com>; Date: Wed, 12 Nov 2014 14:48:22 -0800; Can someone suggest a company or person who would be able to service a neon light at a local pharmacy which is causing MAJOR interference? The venue would be Moscow, Idaho. Lewiston, Idaho is nearby,; /archives//html/RFI/2014-11/msg00015.html (6,705 bytes)
3. Re: [RFI] RFI question (score: 1): Author: D C _Mac_ Macdonald <k2gkk@hotmail.com>; Date: Wed, 12 Nov 2014 17:03:14 -0600; If it's that bad, Ken, I'd suggest contacting FCC! * * * * * * * * * * * * 73 - Mac, K2GKK/5 * * (Since 30 Nov 53) * * k2gkk hotmail com * * Oklahoma City, OK * * USAF & FAA (Ret.) * * * * * * * * *; /archives//html/RFI/2014-11/msg00017.html (7,798 bytes)
4. [RFI] RFI QUESTION (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 22 Dec 2020 00:02:29 +0000; I'm out of ideas on this one! Where does the raspy modulation come from on the harmonics which changes with position in my radio room on a battery operated receiver? Situation: transmit on 7.010 MHz; /archives//html/RFI/2020-12/msg00099.html (7,516 bytes)
5. [RFI] RFI Question (score: 1): Author: Tony <73guddx@gmail.com>; Date: Fri, 12 Feb 2021 02:02:16 -0500; All: The question below came up in a recent conversation: If a device that generates RFI at a consistent level across the HF spectrum were connected to a wire that was 1/2 wavelength at a given HF fr; /archives//html/RFI/2021-02/msg00005.html (6,643 bytes)
6. Re: [RFI] RFI Question (score: 1): Author: Christopher Wawak <kc2ieb@wawak.org>; Date: Fri, 12 Feb 2021 08:09:58 -0500; I put my vote on the resonance causing the RFI to be stronger at that frequency. Are you thinking other reflections/etc might cancel out the spike at the resonant frequency? _________________________; /archives//html/RFI/2021-02/msg00006.html (7,481 bytes)
7. Re: [RFI] RFI Question (score: 1): Author: Dan K2YWE <dan.k2ywe@gmail.com>; Date: Fri, 12 Feb 2021 09:34:06 -0500; Almost that simple IMHO. Given the hypothetical device can drive the impedances at all frequencies equally, the radiated patterns will have the characteristics of the antenna at those frequencies, so; /archives//html/RFI/2021-02/msg00007.html (9,619 bytes)
8. Re: [RFI] RFI Question (score: 1): Author: Al Groff via RFI <rfi@contesting.com>; Date: Fri, 12 Feb 2021 08:36:31 -0600; Tony, All RF energy presented to the wire is radiated ( disregarding losses ). The radiation pattern will be different at different frequencies ( location of peaks and nulls or the radiated energy c; /archives//html/RFI/2021-02/msg00008.html (8,876 bytes)
9. Re: [RFI] RFI Question (score: 1): Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>; Date: Fri, 12 Feb 2021 14:39:30 +0000; Based on my experience, I'm also in the "stronger signal" camp. One example, when I had tracked down a touch lamp noise that was strongest on 20meters several years ago, I found the noise strongest i; /archives//html/RFI/2021-02/msg00009.html (9,344 bytes)
10. Re: [RFI] RFI Question (score: 1): Author: Christopher Wawak <kc2ieb@wawak.org>; Date: Fri, 12 Feb 2021 09:41:37 -0500; I can't be the only one who read this and made a mental note to check for extension cords around the house. hihi! Thank you for sharing! 73 kc2ieb chris ______________________________________________; /archives//html/RFI/2021-02/msg00010.html (8,032 bytes)
11. Re: [RFI] RFI Question (score: 1): Author: Mike Martin <mike@rfiservices.com>; Date: Fri, 12 Feb 2021 10:12:12 -0500; Hey Eddie that's a great story, one I have repeated many times over the years. Happy 2021, Mike Get BlueMail for Android _______________________________________________ RFI mailing list RFI@contestin; /archives//html/RFI/2021-02/msg00011.html (8,924 bytes)
12. Re: [RFI] RFI Question (score: 1): Author: Ray LaRue <w4byg@att.net>; Date: Fri, 12 Feb 2021 16:33:57 +0000; I think you are right, it's not as simple as that. The output impedance of the generating device would seem to be significant. In many cases it would not be easy to ascertain that output impedance, o; /archives//html/RFI/2021-02/msg00012.html (9,049 bytes)
13. Re: [RFI] RFI Question (score: 1): Author: "Gary Peterson" <kzerocx@rap.midco.net>; Date: Fri, 12 Feb 2021 11:16:03 -0700; This reminds me of a broadband noise that appeared on 75 meters. It would come and go suddenly, happened at about the same time every day and sounded like the rhythm of an old, Maytag washing machine; /archives//html/RFI/2021-02/msg00013.html (8,284 bytes)
14. Re: [RFI] RFI Question (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 12 Feb 2021 18:46:34 +0000; The phenomenon is well known as resonant excitation. Hit a bell with the clapper. The impulse of the clapper hitting the inside wall of the bell theoretically contains all frequencies. The structure; /archives//html/RFI/2021-02/msg00014.html (9,781 bytes)
15. Re: [RFI] RFI Question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 12 Feb 2021 11:33:21 -0800; That feeling is correct. Simple way to study it. Build a simple NEC model and compute the response for a range of frequencies, one after another. Write down the field strength at the same horizontal; /archives//html/RFI/2021-02/msg00015.html (9,103 bytes)
16. Re: [RFI] RFI Question (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Fri, 12 Feb 2021 14:43:28 -0600; This works in both directions, of course. I once had a neighbor with a wall-mounted telephone with a long coiled handset cord. The usual filters just couldn't keep the RF out of that phone, unless I; /archives//html/RFI/2021-02/msg00016.html (10,440 bytes)
17. Re: [RFI] RFI Question (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 12 Feb 2021 21:02:11 +0000; I'll cease with this last example. Having once played the pipe organ, the organ pipe is also a good example of resonant excitation. The wind blown into the bottom of each pipe is pretty much white, a; /archives//html/RFI/2021-02/msg00017.html (12,836 bytes)

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