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1. [TowerTalk] Equinox Day (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Sun Mar 16 00:50:21 2003; No. It's due to the non-zero angular diameter of the sun plus atmospheric refraction... See: <http://aa.usno.navy.mil/faq/docs/equinoxes.html> Michael Keane K1MK k1mk@alum.mit.edu; /archives//html/Towertalk/2003-03/msg00204.html (7,302 bytes)
2. [Towertalk] yagis in trees (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Sun, 08 Sep 2002 22:26:23 -0400; While trees aren't covered by zoning or building regulations and there may be no specific rules governing ham-antenna-in-trees, it doesn't necessarily mean that placement of an antenna in a tree is s; /archives//html/Towertalk/2002-09/msg00310.html (9,120 bytes)
3. [Towertalk] yagis in trees (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 09 Sep 2002 07:26:37 -0700 (PDT); True enough. Sometimes... and at other times it can be totally demoralizing to be forced into pulling down all of one's hard work. There are many ways to skin a cat. But, as with the rules that might; /archives//html/Towertalk/2002-09/msg00326.html (8,522 bytes)
4. [Towertalk] SWR & Speed of Light? (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 26 Sep 2002 04:53:44 -0700 (PDT); students I'm with Dave, there's much less here than meets the eye. It's a cute physics lab demo, but what it's doing is making use of dispersion to do pulse shaping. The applied pulse width & shape i; /archives//html/Towertalk/2002-09/msg00852.html (8,622 bytes)
5. [Towertalk] Models and real world --oops (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 11 Jul 2002 08:49:52 -0700 (PDT); says Dr. Leeson wrote "... EXPERIMENT always trumps theory." http://lists.contesting.com/_towertalk/1997-March/003381.html There be a vast world of difference between experience and experiment, which; /archives//html/Towertalk/2002-07/msg00291.html (8,960 bytes)
6. [Towertalk] Models and real world --oops (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 11 Jul 2002 12:22:21 -0700 (PDT); Jim, Does it now 'NNC, I wonder why? Maybe because we were prowling opposite banks away back when. Love that muddy water? ;-) Yes. And just as suicidal as unquestioningly believing everything that we; /archives//html/Towertalk/2002-07/msg00295.html (9,932 bytes)
7. [Towertalk] Rohn 25G rating (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Wed, 22 May 2002 23:02:04 -0400; With great, great care. Those pressures probably represent the peak pressure on a flat surface and the tower was old enough that capacities are based upon EIA RS-222-C (or earlier); "Zone A" under RS; /archives//html/Towertalk/2002-05/msg00622.html (10,374 bytes)
8. [Towertalk] Rohn 25G rating (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 23 May 2002 00:02:45 -0400; Sea level at a nominal temperature and relative humidity. The density of the air is down by 15% (3% per 1000'), but the dynamic pressure goes like rho*v^2 A wind speed of 92 mph @ 5000' is the pressu; /archives//html/Towertalk/2002-05/msg00627.html (8,705 bytes)
9. [Towertalk] Re: Tower Comparisons (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 23 May 2002 04:36:03 -0700 (PDT); twice. For anyone analyzing their own designs, the sobering point of Ford's and others TowerTalkians' experiences should be to underscore that gusts of 80 MPH and higher are absolutely to be expected; /archives//html/Towertalk/2002-05/msg00639.html (7,348 bytes)
10. [Towertalk] Windload "partway up" (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 23 May 2002 09:13:24 -0700 (PDT); The point is not that there are changes in the distribution and magnitudes of the loads and moments but that "add it all up" provides an answer which is to first order accurate for guyed towers and e; /archives//html/Towertalk/2002-05/msg00652.html (8,015 bytes)
11. [Towertalk] Low-Angle Scattering (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 01 Apr 2002 08:35:39 -0800 (PST); Pete, No it isn't. Scattering by itself might be expected to partially fill in the nulls, reducing their depth. If the models predict a greater intensity near zero elevation than in the peak of the p; /archives//html/Towertalk/2002-04/msg00009.html (7,487 bytes)
12. [Towertalk] Explain this! (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Thu, 25 Apr 2002 05:09:06 -0700 (PDT); St. Elmo's Fire? Michael Keane K1MK k1mk@alum.mit.edu ________________________________________________ PeoplePC: It's for people. And it's just smart. http://www.peoplepc.com; /archives//html/Towertalk/2002-04/msg01013.html (7,991 bytes)
13. [Towertalk] limitations of stacking (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 25 Mar 2002 13:01:36 -0800 (PST); Non sequiturs about short antennas, loading, Qs, and losses not withstanding, application of that conceptual picture to the specific problem that was presented fails to make physical sense. In this c; /archives//html/Towertalk/2002-03/msg00633.html (12,976 bytes)
14. [Towertalk] limitations of stacking (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 25 Mar 2002 22:19:14 -0500; Really. Is it such a radical concept? Because the two antennas would have to possess different radiative resistances. Add to that the century and a half of physics subsequent to James Clerk Maxwell t; /archives//html/Towertalk/2002-03/msg00655.html (9,244 bytes)
15. Re: [TowerTalk] BBC report on bird kills at towers (score: 1): Author: "Michael Keane, K1MK" <k1mk@alum.mit.edu>; Date: Sat, 23 Aug 2003 01:16:13 -0400; At 06:25 PM 8/22/03, Tom Champlin wrote: How would you know that? Have you counted the "cat kills" ?? Or are you just running your big mouth and showing your ignorance??? Tom http://migratorybirds.fw; /archives//html/Towertalk/2003-08/msg00773.html (9,810 bytes)
16. RE: [TowerTalk] BBC report on bird kills at towers (score: 1): Author: "Michael Keane, K1MK" <k1mk@alum.mit.edu>; Date: Sat, 23 Aug 2003 02:19:20 -0400; At 02:09 PM 8/22/03, David Robbins K1TTT wrote: I find more birds dead under my big windows than I find around the base of any of the 6 towers here. Not a surprising observation since according to Ma; /archives//html/Towertalk/2003-08/msg00775.html (10,804 bytes)
17. Re: [TowerTalk] Bird Kill Towers? (score: 1): Author: "Michael Keane, K1MK" <k1mk@alum.mit.edu>; Date: Sat, 23 Aug 2003 03:44:37 -0400; At 12:46 AM 8/23/03, Bgsalesmel@cs.com wrote: I think this "reporter" just had a case of the "what do I write today" blues. Likely true. But the timing of the story so closely following the press rel; /archives//html/Towertalk/2003-08/msg00778.html (7,757 bytes)
18. Re: [TowerTalk] Calculations (score: 1): Author: Michael Keane K1MK <k1mk@alum.mit.edu>; Date: Sun, 12 Sep 2004 09:06:14 -0400; At 03:58 AM 9/12/04, WarrenWolff@aol.com wrote: And once a fellow gets a set of 90 MPH calculations for $250 or so, why, o' why should any future sales of the same calculations cost the next fellow t; /archives//html/Towertalk/2004-09/msg00204.html (8,397 bytes)
19. Re: [TowerTalk] installing monster masts intowers(and ?twothrustbearings?) (score: 1): Author: Michael Keane K1MK <k1mk@alum.mit.edu>; Date: Fri, 10 Jun 2005 12:16:20 -0400; Well, some of the generalizations about about what's typical have left me confused. I do recognize the above description as something more familiar, the Thrust Bearings that Rohn sells, the TB3 & TB4; /archives//html/Towertalk/2005-06/msg00253.html (10,974 bytes)
20. Re: [TowerTalk] Pad and Pier for ROHN SSV. Pad and Pier Foundations (score: 1): Author: Michael Keane K1MK <k1mk@alum.mit.edu>; Date: Tue, 12 Jul 2005 12:00:02 -0400 (EDT); One would expect to be able to find something about the assumed soil conditions somewhere in the drawing notes, typically in the notes to the foundation drawing(s). Normal soil usually has a specific; /archives//html/Towertalk/2005-07/msg00279.html (11,791 bytes)

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