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Total 119 documents matching your query.

61. Re: [RFI] [dx-list] South Cook (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 21 Feb 2006 19:59:06 -0600
Nice, evenly spaced dots and dashes on the TV screen; a definite growling sound heard over the local AM Band Class A broadcast stations - I think we have discovered a *new* source of energy. Jim P -
/archives//html/RFI/2006-02/msg00021.html (9,934 bytes)

62. Re: [RFI] Fw: cell phone interference on airplanes (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 1 Mar 2006 19:36:29 -0600
What? I would have to guess that you haven't flown in the last ten years or so; maximum use was made of the back-of-the-seat GTE Airfone service that morning. Doesn't anybody remember the GTE Supervi
/archives//html/RFI/2006-03/msg00002.html (9,762 bytes)

63. Re: [RFI] Fw: cell phone interference on airplanes (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 1 Mar 2006 22:35:59 -0600
I don't believe it. This is the continued making of another pernicious urban legend IMNSHO. The popular account of these events ALWAYS cites 'cell phones'. Balderdash. I don't and won't buy it based
/archives//html/RFI/2006-03/msg00004.html (12,623 bytes)

64. Re: [RFI] Fw: cell phone interference on airplanes (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 2 Mar 2006 20:22:46 -0600
Two words: "Proper engineering" 1) Proper placement of T and R antennas on the outside of the fuselage 2) Control of and proper freq spacing and inter-transmitter isolation with filter and or isolat
/archives//html/RFI/2006-03/msg00009.html (10,458 bytes)

65. Re: [RFI] cellphones on airplanes (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 2 Mar 2006 20:40:02 -0600
Can you say "transmitter intermodulation"? Background: Multiple phones in close proximity can ceate some not so insignificant levels of 3rd and 5th order Imod products; now imagine every fifth perso
/archives//html/RFI/2006-03/msg00010.html (7,905 bytes)

66. Re: [RFI] Noise Help (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sun, 23 Apr 2006 19:25:14 -0500
First impression - This sounds characteristicly like a shorted or 'cycling' doorbell or thermostat transformer (it is that time of year, it is warming up, those transformers in the attic see a really
/archives//html/RFI/2006-04/msg00011.html (9,184 bytes)

67. Re: [RFI] Fan Noise on Repeater (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 9 May 2006 08:39:03 -0500
13) Are there any other sources of RF in the area? (Like commercial FM broadcast, LPTV etc) 14) Is your equipment in a position where it might be seeing your own RF/transmitted signal? (Follow up to
/archives//html/RFI/2006-05/msg00005.html (10,054 bytes)

68. Re: [RFI] Fan Noise on Repeater (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 9 May 2006 21:07:14 -0500
Harmonics through the 2M band? Or, how about a fundamental that creates harmonics through only about 600 KHz (the standard offset for a 2M repeater)? Scenario: 2M xmit energy mixes with wideband has
/archives//html/RFI/2006-05/msg00013.html (10,162 bytes)

69. Re: [RFI] Defibrillator and RF Exposure Query (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 9 May 2006 21:53:03 -0500
haven't Fortunately, the EME folks have fairly focused arrays and only have to worry about 'sidelobes' (i.e. side lobe energy or -ug- radiation) placing energy into areas occupied by humans; unlike o
/archives//html/RFI/2006-05/msg00015.html (7,667 bytes)

70. Re: [RFI] Defibrillator and RF Exposure Query (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Sat, 13 May 2006 23:05:11 -0500
Agreed. Maybe I'm missing something in regards to the caveat: "and operate on the lower HF bands". I am of the understanding that a 1/2 wave or 1/4 wave 'ground plane' (the ground radials *do* form a
/archives//html/RFI/2006-05/msg00017.html (10,286 bytes)

71. Re: [RFI] Defibrillator and RF Exposure Query (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Mon, 15 May 2006 21:52:49 -0500
I think you're overlooking something here Jim, vis-a-vis near-field versus far-field effects (1) as presented by an excited antenna. The effects which I am addressing are the strong non-radiated 'fie
/archives//html/RFI/2006-05/msg00022.html (11,626 bytes)

72. Re: [RFI] Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 8 Aug 2006 20:39:27 -0500
Yeah, it probably is "atmospheric" since everyone seems to attribute the 'blame' that way (but I would ask you or anyone else to cite me "studied work" on the subject to support that contention.) Cha
/archives//html/RFI/2006-08/msg00005.html (8,278 bytes)

73. Re: [RFI] Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 9 Aug 2006 21:58:25 -0500
Jim, Are you saying that you hear power-line (and other non-intentionally generated, incidental) 'noise' (like blenders, brush-type drill motors and the like) originating from far away, e.g. hundreds
/archives//html/RFI/2006-08/msg00007.html (8,761 bytes)

74. Re: [RFI] Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 9 Aug 2006 23:20:26 -0500
I HAVE heard brief, slow rises and falls of broad-band white noise several times in the last couple of years on 10 Meters; the first time I thought the rig had experienced some sort of 'issue'. The n
/archives//html/RFI/2006-08/msg00010.html (11,492 bytes)

75. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Wed, 9 Aug 2006 23:37:54 -0500
Jim, I think I can sum up what you said then thusly: The multiplicity of non-intentinal emitters in the 'skip zone' contributes to the overall observed rise in noise level by the effect of summation
/archives//html/RFI/2006-08/msg00011.html (10,688 bytes)

76. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Thu, 10 Aug 2006 09:14:25 -0500
"But for most sources, the transition from near to far field occurs at roughly 1/6 wavelength" I don't believe sources I cited not a month of two back are in agreement with that statement NOR does it
/archives//html/RFI/2006-08/msg00016.html (9,669 bytes)

77. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Fri, 11 Aug 2006 19:32:14 -0500
Tom, I would believe you, maybe, if it wasn't for evidence and measurements and observations like this made with test equipment: Relative strengths of two alternative l.f. antennas: o E-field antenna
/archives//html/RFI/2006-08/msg00031.html (10,485 bytes)

78. Re: [RFI] [BULK] Re: Ambient Noise Levels (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Fri, 11 Aug 2006 20:56:02 -0500
The noise I heard didn't occur but about three times that I recall and that was weeks to months apart. (After the 1st - or was it the 2nd - time I noticed it I was primed to note the time and observe
/archives//html/RFI/2006-08/msg00034.html (21,081 bytes)

79. Re: [RFI] Towers/Antennas Near 138kV Transmission Lines (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 15 Aug 2006 08:31:32 -0500
Ed penned: "... scrub & bushes growing out in the middle of the mid-Western USA that were directly beneath long expanses of overhead utility lines were noticeably smaller, & less-robust looking, than
/archives//html/RFI/2006-08/msg00049.html (10,253 bytes)

80. Re: [RFI] IN-band Filters (score: 1)
Author: "Jim P" <jvpoll@dallas.net>
Date: Tue, 7 Nov 2006 22:11:58 -0600
Stubs? Low Q? What are you using - RG58? Q, related to cable loss, is much reduced for the larger diameter coaxial cables, with measured Q's of over 1000 obtainable with 'stubs' made of Heliax at Six
/archives//html/RFI/2006-11/msg00022.html (9,306 bytes)

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