Mail Archive Search: <+from:ingraham.ma.ultranet@rcn.com>

Results:

References: [ +from:ingraham.ma.ultranet@rcn.com: 10 ]

Total 10 documents matching your query.

1. Re: [Antennaware] Receiving Loop (score: 1): Author: "Andy Ingraham" <ingraham.ma.ultranet@rcn.com>; Date: Sun, 13 Aug 2006 16:05:17 -0600; I would guess this is because it has less capacitance per foot than 50 ohm coax, which raises the self-resonant frequency, and allows a wider tuning range for tuned loops. Andy _____________________; /archives//html/Antennaware/2006-08/msg00003.html (6,851 bytes)
2. Re: [Antennaware] Testing the theory.. (score: 1): Author: "Andrew Ingraham" <ingraham.ma.ultranet@rcn.com>; Date: Thu, 29 Mar 2007 17:28:02 -0500; I also recall near-field/far-field expressed in terms of wavelengths. But I believe it depends on both wavelengths and antenna size. So, it seems appropriate to recommend the larger of (say) 10 time; /archives//html/Antennaware/2007-03/msg00011.html (8,517 bytes)
3. Re: [Antennaware] Electrostatic Shielded Loop Antenna (score: 1): Author: "Andrew Ingraham" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 30 Apr 2007 11:44:22 -0400; If you decide to go ahead with this, I suspect that the velocity factor of the hardline does not figure into your calculation of loop size, because the signal in the shielded loop does not exist betw; /archives//html/Antennaware/2007-04/msg00003.html (7,675 bytes)
4. Re: [Antennaware] homemade coil (score: 1): Author: "Andrew Ingraham" <ingraham.ma.ultranet@rcn.com>; Date: Wed, 9 May 2007 15:25:49 -0400; A reply to an old discussion (mid-March) ... I have no personal experience with verticals (aside from engineering at AM radio stations long ago), but from what I've read elsewhere, even a single radi; /archives//html/Antennaware/2007-05/msg00000.html (7,400 bytes)
5. Re: [Antennaware] radials (score: 1): Author: "Andrew Ingraham" <ingraham.ma.ultranet@rcn.com>; Date: Thu, 10 May 2007 18:02:02 -0400; Actually, there wasn't any argument. Just some questions and answers (in March), and my additional recent comments. As I say, I'm not a 'verticals' guy, so I don't necessarily know the proper nomenc; /archives//html/Antennaware/2007-05/msg00003.html (9,395 bytes)
6. Re: [Antennaware] MFJ-259B question (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Fri, 19 Dec 2008 00:29:16 -0500; If you are measuring cable loss, there must NOT be anything connected to the far end of the cable. If there is any element connected anywhere on the cable that absorbs power (like a dummy load or an; /archives//html/Antennaware/2008-12/msg00009.html (7,699 bytes)
7. Re: [Antennaware] RF relay switching problem (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 29 Dec 2008 10:36:10 -0500; One little thought came to mind. Is it possible that the diode actually makes the problem worse, by rectifying the RF that is picked up by the relay and giving the coil a DC current? Maybe the capac; /archives//html/Antennaware/2008-12/msg00015.html (8,539 bytes)
8. Re: [Antennaware] Electrons (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 16 Feb 2009 11:21:03 -0500; This might be misleading to some, so I thought I'd clarify, on what is my understanding about this. About that "pure energy" ... There is no energy radiating from an electron at rest. But there is a; /archives//html/Antennaware/2009-02/msg00017.html (8,148 bytes)
9. Re: [Antennaware] Electrons, Take 2 (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Fri, 20 Feb 2009 16:20:45 -0500; I will try to add my two cents, maybe it will help, maybe not. Some of what we learn in school is indeed meant to be taken for granted, because there are concepts that our human brains have difficul; /archives//html/Antennaware/2009-02/msg00046.html (16,838 bytes)
10. [Antennaware] Two Boston-area talks about antennas, 5/13/09 (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Sat, 9 May 2009 17:42:08 -0400; This coming Wednesday, 13 May 09, there are two IEEE-sponsored presentations related to antennas in the Boston, MA (USA) area: -- "The Plasma Antenna - Now you see it, now you don't" Dr. Igor Alexeff; /archives//html/Antennaware/2009-05/msg00000.html (12,916 bytes)

Current List: 1 - 10
Page: [1]