Search String: Display: Description: Sort:

Results:

References: [ +from:xdavid@cis-broadband.com: 950 ]

Total 950 documents matching your query.

141. Re: [TowerTalk] Capacitors To Tune 160 Vertical (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 29 Nov 2007 12:15:26 -0700
I don't understand that comment. Murphy's Law has nothing to do with it ... Ohms Law does. As N6RK said, where high voltage DC is present, capacitors in series are typically bridged by high value par
/archives//html/Towertalk/2007-11/msg00533.html (10,138 bytes)

142. Re: [TowerTalk] Irrigation pipe vertical (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 01 Dec 2007 14:17:03 -0700
It probably depends somewhat on your radial/ground system, but I get about 7.84 MHz with EZNEC. Dave AB7E _______________________________________________ _____________________________________________
/archives//html/Towertalk/2007-12/msg00022.html (8,070 bytes)

143. Re: [TowerTalk] Crank-Up Tower Base Question (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sun, 02 Dec 2007 13:37:01 -0700
That doesn't really qualify as undisturbed soil, and is pretty much what the manufacturer does not want you to do. Here at my QTH, where I have rocks and sand with just the right amount of clay, if I
/archives//html/Towertalk/2007-12/msg00034.html (9,708 bytes)

144. Re: [TowerTalk] Capacitors To Tune 160 Vertical (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Wed, 05 Dec 2007 14:02:31 -0700
I don't think you get it yet. Normally I'd let it go but you're going to mislead a lot of people here if I do. The original question involved capacitors in the range of 1000 pf, which at 1.8 MHz have
/archives//html/Towertalk/2007-12/msg00092.html (9,889 bytes)

145. Re: [TowerTalk] W6NL 40-2CD => Moxon Conversion (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 08 Dec 2007 09:22:45 -0700
Agreed, and the tip coupling configuration is fairly critical to the performance. Antenna and modeling guru L.B. Cebik, W4RNL, has written a complete book (I bought it) as well as several design and
/archives//html/Towertalk/2007-12/msg00154.html (10,284 bytes)

146. [TowerTalk] More Moxon Stuff (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 08 Dec 2007 10:32:18 -0700
AC6LA wrote a cool little application based upon W4RNL's design algorithms to calculate 2 element Moxon dimensions for any frequency. The neat thing is that it will output a file in .ez format for di
/archives//html/Towertalk/2007-12/msg00156.html (6,837 bytes)

147. Re: [TowerTalk] push on pl 259's (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 08 Dec 2007 17:38:06 -0700
Here's a couple of places I found with a Google search: http://www.therfc.com/uhf.htm (about 3/4 of the way down the page) http://www.pl-259.com/page1.html There is also a guy on eBay who sells them:
/archives//html/Towertalk/2007-12/msg00166.html (9,421 bytes)

148. Re: [TowerTalk] push on pl 259's (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 08 Dec 2007 19:02:56 -0700
The part number on the RF Connection website is RFC83-55PA, which sounds suspiciously like the number you remember ;) I would guess it is Amphenol as well. 73, Dave AB7E _____________________________
/archives//html/Towertalk/2007-12/msg00168.html (11,832 bytes)

149. Re: [TowerTalk] EZ Master OOOPS! (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 10 Dec 2007 01:14:26 -0700
I could be wrong, but I don't think K7LXC reviews and screens the TowerTalk postings ahead of time. He probably wouldn't have the time to do it on a real time basis even if he wanted to. Dave AB7E __
/archives//html/Towertalk/2007-12/msg00183.html (9,047 bytes)

150. Re: [TowerTalk] RF Relay QUestion (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 15 Dec 2007 22:50:44 -0700
It depends upon what your requirements are. If you don't care about isolation between selections and are switching at a point that always has low voltage (maybe at the base of a vertical or something
/archives//html/Towertalk/2007-12/msg00243.html (7,932 bytes)

151. Re: [TowerTalk] Drilling tubing (180 deg) (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Fri, 28 Dec 2007 17:44:23 -0700
Here are some places to find various new ones, and they appear to be all different. Not $10, but the one from Harbor Freight might do the job and it's only $20. http://secure.data-comm.com/GL/Detail.
/archives//html/Towertalk/2007-12/msg00417.html (10,562 bytes)

152. Re: [TowerTalk] concrete (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 31 Dec 2007 10:40:14 -0700
Even the manufacturers of various fibers (glass, nylon, polypropylene, steel, kevlar, spun carbon ... in approximate order of strength and cost) refer to them as "secondary reinforcement" and specifi
/archives//html/Towertalk/2007-12/msg00512.html (9,117 bytes)

153. Re: [TowerTalk] shrink tubing & coax connectors (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Wed, 02 Jan 2008 20:47:22 -0700
There is a guy with an eBay storefront who sells all kinds of heat shrink tubing in several sizes, including 3M adhesive lined. I've bought stuff from him before and he's quick and extremely fair. Th
/archives//html/Towertalk/2008-01/msg00046.html (9,543 bytes)

154. Re: [TowerTalk] Maine Weather (WEBCAM) (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 15 Jan 2008 09:59:13 -0700
Thanks for researching that. I'm in the process of putting up a tower with a couple of HF yagis on it (finished digging the hole yesterday), and I've been thinking of mounting a webcam on the undersi
/archives//html/Towertalk/2008-01/msg00292.html (8,635 bytes)

155. [TowerTalk] Exothermic Connections (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 15 Jan 2008 13:52:16 -0700
I'm in the process of putting up a tower and need to make lots of Cadweld connections (tower to rebar cage, tower to lightning radials, lightning radials to ground rods, common ground point at entran
/archives//html/Towertalk/2008-01/msg00297.html (11,106 bytes)

156. [TowerTalk] HAARP Test (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Fri, 18 Jan 2008 14:42:58 -0700
A few folks here previously commented that they would have liked to participate in the last HAARP receiving test. I just saw this posting that says there will be another one this evening and tomorrow
/archives//html/Towertalk/2008-01/msg00370.html (8,615 bytes)

157. Re: [TowerTalk] Optimum yagi stacking distance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 19 Jan 2008 10:24:33 -0700
HFTA is a terrific program but it has a known error when analyzing stacked antennas. It gives you good guidance for deciding the heights of stacked antennas to optimize the pattern for your particula
/archives//html/Towertalk/2008-01/msg00407.html (9,884 bytes)

158. Re: [TowerTalk] Optimum yagi stacking distance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 19 Jan 2008 19:26:56 -0700
Hi, Bill. I didn't state that very well. I was trying to say that 30 feet SPACING was as little as I would use for the tribanders. I wasn't referring to the height. By the way, I do have that that so
/archives//html/Towertalk/2008-01/msg00419.html (11,127 bytes)

159. [TowerTalk] Digital Angle Gauge (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 21 Jan 2008 01:18:49 -0700
There was a message thread here a few weeks ago about how to plumb a tower, with several suggestions ranging from using a plumb bob to a laser level to a transit. I've been installing the base for my
/archives//html/Towertalk/2008-01/msg00431.html (7,877 bytes)

160. Re: [TowerTalk] Digital Angle Gauge (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 21 Jan 2008 10:37:49 -0700
<<Plumb bobs are pretty much useless except indoors or over very short distances.>> Yes, I agree. I suppose a heavy bob hung from thin line and immersed in a pail of water for dampening would get you
/archives//html/Towertalk/2008-01/msg00441.html (8,676 bytes)

Current List: 141 - 160
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
This search system is powered by Namazu