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41. [TowerTalk] [Fwd: Protected Land Area] (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 27 Jun 1998 12:09:57 +0000; a commonly used first approximation is that a tall structure protects a radius equal to its height. but lightning is very unpredictable and can hit objects directly under a taller structure. To: <tow; /archives//html/Towertalk/1998-06/msg00955.html (9,687 bytes)
42. [TowerTalk] Mismatch loss is REAL loss (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 27 Jun 1998 17:57:26 +0000; I'll see your two cents and up you a nickle. RG-8 in the relatively short lengths used by most amateurs for decently matched antennas is as lossless as anyone will ever need. Consider 300 baud rtty o; /archives//html/Towertalk/1998-06/msg00960.html (14,729 bytes)
43. [TowerTalk] more - Precip static (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 02 May 1998 00:08:58 +0000; they are two different things. the sharp points will enourage corona at lower field strengths and create the 'charge cloud' that reduces the field below it. the questions with these are: is any coron; /archives//html/Towertalk/1998-05/msg00035.html (9,921 bytes)
44. [TowerTalk] more - Precip static (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sun, 03 May 1998 19:51:11 +0000; a rounded object above the antenna would most likely do nothing at all. the smooth object would not induce any extra corona that would create the charge cloud that would reduce the field strength bel; /archives//html/Towertalk/1998-05/msg00100.html (10,396 bytes)
45. [TowerTalk] more - Precip static (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Tue, 05 May 1998 00:00:08 +0000; is that why so many people used to replace car whips with coat hangers? did the 'quad' design of the coat hanger work better? or am i starting to mix up my threads again???? -- David Robbins K1TTT (e; /archives//html/Towertalk/1998-05/msg00150.html (10,402 bytes)
46. [TowerTalk] more - Precip static (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Tue, 05 May 1998 00:03:23 +0000; i'll agree with this, but more later. true, but exactly what is the spectrum of this noise. if you know of a good reference or paper on this i would like to get it. the key words are 'the same genera; /archives//html/Towertalk/1998-05/msg00151.html (13,630 bytes)
47. [TowerTalk] Cushcraft Lightning Arrestor (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Fri, 08 May 1998 23:53:48 +0000; WRONG! unless you consider a rise time from zero to maybe tens of thousand of amps in a couple microseconds DC. DC blocking would only help in blocking a slow build up of static such as occurs before; /archives//html/Towertalk/1998-05/msg00298.html (8,494 bytes)
48. [TowerTalk] BP filters against power line noise (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Tue, 12 May 1998 23:35:48 +0000; yes, there are regulations governing radio noise from power lines. i don't have the references here, but could dig them up at work. i believe the best regulations are the fcc's, but they are of cours; /archives//html/Towertalk/1998-05/msg00365.html (9,489 bytes)
49. [TowerTalk] Dealing with Lightning and MCI (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Wed, 13 May 1998 00:28:58 +0000; don't forget the integral of the electric field along the path. this is especially important in this case where the electric field can be very strong under a cloud. in the strong field under the char; /archives//html/Towertalk/1998-05/msg00367.html (11,353 bytes)
50. [TowerTalk] True, True North (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Thu, 02 Apr 1998 23:48:42 +0000; those of us who line up with true north could care less, beam headings won't change and the north star will still be close enough to true north. those of you still trying to figure out which directi; /archives//html/Towertalk/1998-04/msg00053.html (8,160 bytes)
51. [TowerTalk] Pier Pin Installation (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sun, 26 Apr 1998 00:38:59 +0000; a drawing in my rohn catalog shows a 4" projection on a pier pin. -- David Robbins K1TTT (ex KY1H) k1ttt@berkshire.net or robbins@berkshire.net http://www.berkshire.net/~robbins/k1ttt.html -- FAQ on; /archives//html/Towertalk/1998-04/msg00721.html (8,368 bytes)
52. [TowerTalk] junk search--but special junk (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Thu, 30 Apr 1998 00:26:14 +0000; yes, but what alloy are they? i acquired some very nice aluminum tubing from a local place up here some years ago, but it has never been used for anything bigger than a 2m fox hunt beam because they; /archives//html/Towertalk/1998-04/msg00943.html (12,456 bytes)
53. [Fwd: [TowerTalk] precip static (was402-CD vs. EF-240X)] (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Fri, 01 May 1998 01:13:21 +0000; This is a multi-part message in MIME format. --5838B8F410CEEDC4FDEAED77 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit -- David Robbins K1TTT (ex KY1H) k1ttt@berkshire.net; /archives//html/Towertalk/1998-04/msg01020.html (11,464 bytes)
54. [TowerTalk] Ice on guy wires (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Tue, 17 Mar 1998 00:35:39 +0000; up here i put large cable clamps over the ends of the preform grips. on long guy wires (like the top 3 sets on 150' tower) i also put a cable clamp about 1/2 way up the guy. its amazing to watch the; /archives//html/Towertalk/1998-03/msg00288.html (8,153 bytes)
55. [TowerTalk] FIlters (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Thu, 29 Jan 1998 00:32:01 +0000; check out my analysis on quarter wave shorted stubs at: http://www.berkshire.net/~robbins/technote/techref.html#filters this location also has some other references and previous messages on stubs. --; /archives//html/Towertalk/1998-01/msg00473.html (9,695 bytes)
56. [TowerTalk] FIlters (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Fri, 30 Jan 1998 00:17:55 +0000; it depends on your definitions. my stubs are 1/4 wave shorted at the frequency i want to pass. at the second harmonic that i want to get rid of they are 1/2 wave shorted. -- David Robbins K1TTT (ex K; /archives//html/Towertalk/1998-01/msg00489.html (9,561 bytes)
57. [TowerTalk] Re: Filters (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 31 Jan 1998 01:08:56 +0000; check out: http://www.berkshire.net/~robbins/technote/k2trstub.html these are the combinations of stubs that i use here. they are all after the amps. between the radios and the amps i use the ice ban; /archives//html/Towertalk/1998-01/msg00509.html (7,949 bytes)
58. [TowerTalk] Cushcraft 40 meter Beam ??? (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Wed, 12 Nov 1997 23:21:13 +0000; if it is hooked up right and set per the book then plug it in to a radio and try it with a conventional swr meter. you are probably seeing some interference on the analyzer. -- David Robbins K1TTT (e; /archives//html/Towertalk/1997-11/msg00285.html (8,314 bytes)
59. [TowerTalk] 80 meter wire beam (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 01 Nov 1997 00:24:49 +0000; i have one based on the on4un two loop reversable design. it uses a 1/4 wave feed line to the inverted v element with a capacitor at the end... transform the capacitor through the 1/4 wave and you ar; /archives//html/Towertalk/1997-10/msg00002.html (10,669 bytes)
60. [TowerTalk] Re: [DX] Some Thoughts (score: 1): Author: k1ttt@berkshire.net (David Robbins); Date: Sat, 01 Nov 1997 02:17:46 +0000; some of the low data rate digital methods used to communicate with nuclear missile submarines will out perform cw all the time. same with the methods used to retrieve data from planetary probes. ther; /archives//html/Towertalk/1997-10/msg00005.html (7,963 bytes)

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