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Total 1919 documents matching your query.

181. Re: [TowerTalk] FW: low band antenna without good ground (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 25 Sep 2011 19:55:00 +0100
The RF conductivity of the steel is irrelevant, because its high magnetic permeability forces almost all the RF current outward into the skin of zinc (even if the thickness of the plating is less tha
/archives//html/Towertalk/2011-09/msg00325.html (11,057 bytes)

182. Re: [TowerTalk] low band antenna without good ground (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 24 Sep 2011 07:54:09 +0100
Not wasting your time at all. When you are limited to short distances from the base of the antenna, a roll of mesh is equivalent to a large number of individual radials - with the advantage that you
/archives//html/Towertalk/2011-09/msg00306.html (9,923 bytes)

183. Re: [TowerTalk] low band antenna without good ground (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 23 Sep 2011 08:53:57 +0100
With so little ground area, you'll need to try much harder than that - but believe me, it WILL be worth it. Broad strips of radial material will definitely be better. Probably the key reference is st
/archives//html/Towertalk/2011-09/msg00288.html (10,328 bytes)

184. Re: [TowerTalk] Heavy Duty Rotor (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 7 Sep 2011 07:27:42 +0100
You Know You're A Ham, If: You see an old Superfortress in full flying condition and you think, "Hmmm... four prop pitch motors." Roger, stop doing that - it hurts! -- 73 from Ian GM3SEK http://www.i
/archives//html/Towertalk/2011-09/msg00067.html (10,102 bytes)

185. [TowerTalk] Inverted vee mounted above HF Yagi (score: 104)
Author: Jack White <m5pro@hotmail.com>
Date: Wed, 17 Aug 2011 19:31:58 +0000
Hi Guys I have a standard 60ft Versatower with a Yaesu G-1000 and bearing mounted at the top, and just above this I have a Cushcraft A3WS (pic on QRZ). I want to extend the stub mast about 20ft above
/archives//html/Towertalk/2011-08/msg00184.html (7,538 bytes)

186. [TowerTalk] TV tower collapse (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 16 Jul 2011 12:05:52 +0100
The 1000ft TV tower serving the northern part of the Netherlands caught fire and collapsed yesterday: <http://www.youtube.com/watch?v=VdMLiL4vlHc> -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek
/archives//html/Towertalk/2011-07/msg00237.html (6,819 bytes)

187. Re: [TowerTalk] Copper Pipe Ground Rods - Driving them in - How ? (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 25 May 2011 19:30:07 +0100
For SDS+ you can also buy a 0.5in sq socket adapter (eg www.screwfix.com/p/sds-plus-nut-driver/16662). The flat end makes a good hammer for driving rods, and you can add a socket of just the right si
/archives//html/Towertalk/2011-05/msg00426.html (10,336 bytes)

188. Re: [TowerTalk] book Tribander comparison test (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 3 Mar 2011 07:41:52 +0000
[...] What do you mean by "95% efficient for the total boom length"? -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ _____________________________
/archives//html/Towertalk/2011-03/msg00039.html (8,413 bytes)

189. Re: [TowerTalk] compression PL259 (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 21 Jan 2011 19:44:44 +0000
Ah... dreadful sorry :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ _______________________________________________ TowerTalk mailing list To
/archives//html/Towertalk/2011-01/msg00365.html (9,343 bytes)

190. Re: [TowerTalk] compression PL259 (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 21 Jan 2011 19:44:06 +0000
Yes, the N series from Greenpar were probably the first of that improved 'compression sleeve' type... must be well over 30 years ago now. The PL-259 variant is a relatively recent introduction, while
/archives//html/Towertalk/2011-01/msg00364.html (9,375 bytes)

191. Re: [TowerTalk] compression PL259 (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 21 Jan 2011 18:36:06 +0000
The drawing seems correct but the photograph shows the variant with a slimmer body for RG58. I will add one to the Farnell order planned for Monday (can always use another '259) so will confirm for s
/archives//html/Towertalk/2011-01/msg00358.html (10,259 bytes)

192. Re: [TowerTalk] compression PL259 (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 21 Jan 2011 17:40:00 +0000
The design originated with a British company called Greenpar, which was bought by MA/COM, which in turn is now part of the Tyco empire. Other manufacturing licences may have been granted (eg to the M
/archives//html/Towertalk/2011-01/msg00349.html (8,715 bytes)

193. Re: [TowerTalk] compression PL259 (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 21 Jan 2011 15:57:42 +0000
The RFU-503 is -NOT- the type of connector that I was describing and recommending. I have tried the RFU-503 type and they are far inferior to 'European' design. The anchoring strength of the RFU-503
/archives//html/Towertalk/2011-01/msg00346.html (9,982 bytes)

194. Re: [TowerTalk] Compression-type PL-259s (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 20 Jan 2011 23:05:26 +0000
Highly recommended. I used the compression sleeve N type for years, and was very happy when they also became available in a PL259. Cable prep consists of one flush cut through the jacket, braid and i
/archives//html/Towertalk/2011-01/msg00328.html (9,025 bytes)

195. Re: [TowerTalk] current balance in ladder line? (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 19 Jan 2011 09:04:14 +0000
But there aren't only two terminals at the output from a transmitter/ATU into a "balanced" feedline. There are always three terminals - the third being the transmitter's ground terminal. It is the gr
/archives//html/Towertalk/2011-01/msg00290.html (11,040 bytes)

196. Re: [TowerTalk] Fwd: WHOLE HOUSE SURGE SUPRESSORS (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 4 Jan 2011 08:25:37 +0000
We don't truly mean "equalize" and "same potential" here. When MOVs conduct, they do not crowbar their two terminals together to equalize the voltages. They act more like bidirectional zener diodes,
/archives//html/Towertalk/2011-01/msg00076.html (8,562 bytes)

197. Re: [TowerTalk] 80/40 coax trap dipole design (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 17 Dec 2010 13:27:09 +0000
Yes, it will. The point you are missing is that the mode of resonance changes between the two bands. On the lower band, the mode of resonance is a conventional shortened half-wave; the current has th
/archives//html/Towertalk/2010-12/msg00301.html (9,963 bytes)

198. Re: [TowerTalk] Breaking all the tower climbing rules at an amazingheight... (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 2 Dec 2010 08:08:07 +0000
Don't argue about safety with anyone who is prepared to die for his beliefs :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ __________________
/archives//html/Towertalk/2010-12/msg00044.html (9,766 bytes)

199. Re: [TowerTalk] Tuners (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 30 Nov 2010 07:51:11 +0000
When calculating tuner losses we need two separate parameters, Rs (the loss resistance) and X (the effective reactance, with capacitive effects *included*). Combining these into a single "Q" value is
/archives//html/Towertalk/2010-11/msg00510.html (10,766 bytes)

200. Re: [TowerTalk] Fulton K-1550 winch (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 21 Oct 2010 07:29:16 +0100
Please tell us how, for future reference. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ _______________________________________________ TowerTal
/archives//html/Towertalk/2010-10/msg00245.html (8,092 bytes)


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