Mail Archive Search: <+from:btippett@alum.mit.edu>

Results:

References: [ +from:btippett@alum.mit.edu: 175 ]

Total 175 documents matching your query.

81. [TowerTalk] Vertcal Dipole (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 18 Oct 2004 06:07:33 -0400; K6GT wrote: Isn't everything? What I mean is, isn't that the definition of resonance in this sort of application? Or is there another definition I should know? At resonance, X is not necessarily zer; /archives//html/Towertalk/2004-10/msg00485.html (8,915 bytes)
82. [TowerTalk] Re: Analyzer zero reactance (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 18 Oct 2004 07:30:50 -0400; At 07:19 AM 10/18/04, Tom Rauch wrote: The analyzer is susceptible to external voltages. As little as a few millivolts external voltage can make the analyzer not read zero. Which may explain why my M; /archives//html/Towertalk/2004-10/msg00488.html (9,092 bytes)
83. [TowerTalk] Par Electronics - End-fed 1/2 wl antennas (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 18 Oct 2004 11:43:31 -0400; advertisement but make no mistake about it, the coax is the counterpoise in that antenna. I'm sure that is true, but the current must be quite low. This is probably summarized by AA5TB (not Par) here; /archives//html/Towertalk/2004-10/msg00499.html (9,953 bytes)
84. [Antennaware] MMANA (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sat, 06 Nov 2004 15:39:11 -0500; copy of EZNEC (or ....) and start modeling. A Russian friend recommended MMANA as being much easier than Eznec but using the same NEC-2 engine. Since it is free, it would certainly be worth a try for; /archives//html/Towertalk/2004-11/msg00127.html (7,133 bytes)
85. [TowerTalk] MMANA (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sat, 06 Nov 2004 15:43:11 -0500; I forgot to add the NEC-2 link: http://www.qsl.net/ua3avr/ 73, Bill W4ZV _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather; /archives//html/Towertalk/2004-11/msg00128.html (6,580 bytes)
86. [TowerTalk] LaZV - 4square/spitfire alternative (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 22 Feb 2005 08:45:50 -0500; I use something similar on 160. My driven element is a 180' shunt-fed tower, with a director and reflector made of lazy V's. I only have this configured for NE/SW at the moment, but modeling shows it; /archives//html/Towertalk/2005-02/msg00511.html (7,798 bytes)
87. Re: [TowerTalk] phasing antennas (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 15 Mar 2005 08:23:43 -0500; were an odd 1/4 wavelength to make sure they REALLY were the same length. Gregg, I did exactly that for my 3-stack on 10 meters. If you are using one piece of coax, I doubt you even need to do anythi; /archives//html/Towertalk/2005-03/msg00329.html (8,767 bytes)
88. [TowerTalk] MicroDEM (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 15 Mar 2005 08:48:23 -0500; 200ft hill that gradually rises the +200ft over 2 miles toward EU has a better low angle coverage that the same antenna system on the top of a 50ft hill that gradually falls -50ft over 2 miles toward; /archives//html/Towertalk/2005-03/msg00330.html (7,639 bytes)
89. [TowerTalk] phasing antennas (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 15 Mar 2005 09:23:18 -0500; the pattern is fairly insensitive to slight differences in phase. I recall seeing little difference for ~10 degree phase difference, which is far more error than you would get by simply cutting lines; /archives//html/Towertalk/2005-03/msg00331.html (7,851 bytes)
90. [TowerTalk] phasing antennas (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 15 Mar 2005 11:06:09 -0500; Jim, none of your examples really apply to the case under discussion. 10 degrees phase difference is simply insignificant in a Yagi stack. I just checked the +/- 10 degree case and it only made a 0.0; /archives//html/Towertalk/2005-03/msg00343.html (8,415 bytes)
91. [TowerTalk] Re phasing antennas (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 15 Mar 2005 13:41:37 -0500; K9KL: Open and tune for min Z...OR...short and tune for max Z. Max Z is a sharper peak but is probably off-scale on your MFJ. Therefore, open and tuning for min Z is the better option. 73, Bill W4ZV; /archives//html/Towertalk/2005-03/msg00348.html (6,795 bytes)
92. [TowerTalk] (no subject) (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 16 Mar 2005 05:58:36 -0500; I am posting this for my friend Jack W4OWJ. Please reply direct to Jack at matt4988@bellsouth.net . 73, Bill W4ZV I would appreciate help in determining the correct attachment height for a gin pole c; /archives//html/Towertalk/2005-03/msg00377.html (8,169 bytes)
93. Re: [TowerTalk] How can a SteppIR Perform So Well? (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 17 Mar 2005 07:18:44 -0500; contributor to gain. bandwidth. This allows the antenna to be configured for "optimal" gain at a given frequency with a fixed feed impedance of 22 ohms. It turns out that if you get to optimize the e; /archives//html/Towertalk/2005-03/msg00453.html (9,087 bytes)
94. Re: [TowerTalk] 40 meters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 18 Mar 2005 07:24:59 -0500; doing that on 40 or 80. You're too far east to see it from your area. EU sunset is generally after sunrise here so it doesn't line up right for darkness at each end of the path. From here (NC), long; /archives//html/Towertalk/2005-03/msg00544.html (9,108 bytes)
95. Re: [TowerTalk] 40 meters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 18 Mar 2005 08:33:10 -0500; That makes two of you. :-) 73, Bill W4ZV _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call; /archives//html/Towertalk/2005-03/msg00548.html (8,617 bytes)
96. Re: [TowerTalk] Multiple antennas-- offpointed stacks (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 04 Apr 2005 19:34:21 -0400; had compromised results. I wonder what others have observed. My 10m 3-stack has antennas 1 wavelength apart.More often than not I used 2 in one direction and the third in an orthogonal direction (e.g; /archives//html/Towertalk/2005-04/msg00154.html (8,596 bytes)
97. [TowerTalk] W3CRA's location (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 26 Apr 2005 10:01:51 -0400; While doing a little research on AC5PN (not A51PN who is a different station), I checked my K4RID log entry from 12/11/1960 when I worked Chhawna on my 16th birthday. I got a 579 from him and noticed; /archives//html/Towertalk/2005-04/msg00714.html (7,824 bytes)
98. Re: [TowerTalk] W3CRA's location (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 26 Apr 2005 12:32:25 -0400; If anyone has a USA Callbook from the 60's, please look up W3CRA (Frank Lucas in Canonsburg, PA...not the recent Collins Radio Association trustee) and send me his address (off-list). With Mapquest o; /archives//html/Towertalk/2005-04/msg00718.html (8,011 bytes)
99. [TowerTalk] W3CRA Mystery Solved (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 26 Apr 2005 16:30:31 -0400; http://users.vnet.net/btippett/w3cra.htm 73, Bill W4ZV _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lo; /archives//html/Towertalk/2005-04/msg00723.html (7,176 bytes)
100. [TowerTalk] Lamp cord as antenna feed line (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 27 Apr 2005 08:47:56 -0400; N1LO: to get lossy once you get above 20 meter band. Stay away from lamp cord! ET3PMW tried this on 80 and 160 and it had terrible losses even there. When he switched to ladder line, his signal on 80; /archives//html/Towertalk/2005-04/msg00734.html (6,911 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9]