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References: [ +from:jvpoll@dallas.net: 119 ]

Total 119 documents matching your query.

101. Re: [RFI] Power Lines (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 23 Dec 2007 17:33:03 -0600
Now, imagine your 'power mains' are 400 Hz 115V 3 phase - those are the kinds of systems I've had more experience with (off-line switchers powering HV supplies for TWT and Magnetron-based pulse 'tran
/archives//html/RFI/2007-12/msg00054.html (8,693 bytes)

102. Re: [RFI] Corona Noise Profile? (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 6 Jan 2008 08:23:32 -0600
Kelly, I think you are pretty close to the answer. The noise blankers on the old GE (and Motorola) low-band VHF radios used a separate TRF (Tuned RF) receiver to amplify the 'noise' - and the last s
/archives//html/RFI/2008-01/msg00009.html (7,945 bytes)

103. Re: [RFI] RF quiet wired routers (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 6 Jan 2008 08:50:43 -0600
??? Is this a plug-in ETHERNET card, a router or a switch? If this is router/switch is there a bit somewwhere in the LAN/ETHERNET protocol that specifies OS (I don't think so)? I'd like to see the R
/archives//html/RFI/2008-01/msg00010.html (8,847 bytes)

104. Re: [RFI] Wired vs Wireless Routers for RFI (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 9 Jan 2008 19:37:32 -0600
The noisy little switcher on my Linksys switch I replaced (for awhile) with a big old linear lab supply ... ran hot as the dickens because the Linksys only wanted 3.3V on the input from the switcher
/archives//html/RFI/2008-01/msg00020.html (10,019 bytes)

105. Re: [RFI] RFI Frustration (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 14 Feb 2008 19:23:45 -0600
Hmmm ... We can work with this. Any ham who is tying to track down 'noise' should have at his disposal a battery-operated AM radio for the utility of its highly directional ferrite 'loopstick' antenn
/archives//html/RFI/2008-02/msg00029.html (10,857 bytes)

106. Re: [RFI] Evils (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 14 Feb 2008 20:00:46 -0600
Old TV IF freqs:: Video 41.25 MHz Audio 45.75 MHZ 2nd IF Audio 4.5 MHz Ham bands? ??? Jim P // WB5WPA // -- Original Message -- From: "rick darwicki" <n6pe@yahoo.com> To: <rfi@contesting.com> Sent: T
/archives//html/RFI/2008-02/msg00031.html (7,187 bytes)

107. Re: [RFI] Evils (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Fri, 15 Feb 2008 23:19:07 -0600
It appears that a lot of people missed the point in all this. Original poster posited: Had 'they' wanted to kill off HR 'they' would have stuck with the 21 MHz freq, but, such has not been the case (
/archives//html/RFI/2008-02/msg00041.html (14,396 bytes)

108. Re: [RFI] 15 meter RFI problem - Super documentation (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 20 Apr 2008 14:35:37 -0500
Wow ... and how timely. I believe I have a spectral 'display' of one of those; it has been bugging me for awhile in my part of the world. Maybe post it a little later ... The key part was this: "The
/archives//html/RFI/2008-04/msg00034.html (8,342 bytes)

109. Re: [RFI] Router RFI (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sat, 26 Apr 2008 12:19:14 -0500
For me, my wired router has a very noisy switching power supply; run it from a large 3.3V linear supply and I have no issue ... YMMV, however. JimP // WB5WPA // _____________________________________
/archives//html/RFI/2008-04/msg00043.html (7,615 bytes)

110. [RFI] HF - 80M - Line Nosie Tracking Expedition in Allen, TX (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sat, 3 May 2008 12:29:10 -0500
It has been awhile since I had anything really worth noting, but about two weeks ago I had a doozy; it was after the big windstorm we had in the DFW area and specifically in the Plano/Allen area. On
/archives//html/RFI/2008-05/msg00000.html (8,716 bytes)

111. Re: [RFI] HF - 80M - Line Nosie Tracking Expedition in Allen, TX (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sat, 3 May 2008 19:50:36 -0500
David, I flagged down a repair crew that afternoon while doing photo recon ... let them know, but as the pole was a riser for a lot with a now-removed structure (was an old house) he didn't want to s
/archives//html/RFI/2008-05/msg00002.html (11,351 bytes)

112. Re: [RFI] Microwave RFI - radiated (?) (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 8 May 2008 13:28:04 -0500
Dale, My old analog-timer "MINUTEMASTER" by Litton (yes, Litton; the manufacturer of magnetrons, etc) produces a lot of RFI that affects 80 Meters for instance, and it is a straight transformer desig
/archives//html/RFI/2008-05/msg00006.html (10,384 bytes)

113. Re: [RFI] DTV and Powerline RFI (score: 1)
Author: jvpoll@dallas.net
Date: Mon, 6 Oct 2008 09:52:00 -0500
I second what Jim says; I've seen screen freezes and pixelation (partial screen or image update) are what I've seen when the S/N ratio reaches the point where FEC (forward error correction) gives up
/archives//html/RFI/2008-10/msg00021.html (8,914 bytes)

114. Re: [RFI] Kenwood TM-D700 (score: 1)
Author: jvpoll@dallas.net
Date: Wed, 29 Oct 2008 21:45:51 -0500
I would like to get a count of how many active 'loops' (feedback or closed loops, also phase-locked loops) there may exist in a transceiver of modern design such as the TM-D700. Figure two or three d
/archives//html/RFI/2008-10/msg00088.html (11,466 bytes)

115. Re: [RFI] DirecTV to ground or not to ground (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 23 Dec 2008 01:35:53 -0600
I'm going to relate this story, because, it underscores the need for a 'static-electricity drain path' to earth; the NEC may be seeking in their usual round-about way to provide this, albeit without
/archives//html/RFI/2008-12/msg00063.html (10,430 bytes)

116. Re: [RFI] DirecTV to ground or not to ground (score: 1)
Author: jvpoll@dallas.net
Date: Wed, 24 Dec 2008 21:04:26 -0600
Just two points in response, Jim: a) I have endeavored to learn the reason why the NEC 'calls out' certain specific methods and have decidely not found the underlying rationale solely based in the 't
/archives//html/RFI/2008-12/msg00071.html (10,195 bytes)

117. Re: [RFI] DirecTV to ground or not to ground (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 24 Dec 2008 21:03:42 -0600
Just two points in response, Jim: a) I have endeavored to learn the reason why the NEC 'calls out' certain specific methods and have decidely not found the underlying rationale solely based in the 't
/archives//html/RFI/2008-12/msg00096.html (10,313 bytes)

118. Re: [RFI] DirecTV to ground or not to ground (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 30 Dec 2008 16:03:22 -0600
Jim, first of all, thank you for your response. You are a valuable asset on the list. I would also stress that there is one more reason for 'grounding' of equipment, esp. anything that has exposure t
/archives//html/RFI/2008-12/msg00101.html (13,278 bytes)

119. [RFI] VLF interference Re: CFLs and LEDs (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 1 Feb 2009 22:06:07 -0600
I've noticed they 'do a number' on the VLF and LF spectrum; the band around 60 kHz WWVB comes alive with a number of carriers when running CFLs (as well as other SMPS!) JimP // WB5WPA // system if __
/archives//html/RFI/2009-02/msg00037.html (9,003 bytes)

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