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Total 1919 documents matching your query.

121. Re: [TowerTalk] Back of desk grounding buss (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sat, 22 Mar 2014 05:41:41 -0500
Agreed. The topic here is "back of the desk grounding", and in that location a massive copper busbar is a big waste of money. Worse still, it may indicate a dangerous lack of understanding. The plac
/archives//html/Towertalk/2014-03/msg00168.html (10,033 bytes)

122. Re: [TowerTalk] AC/DC injection on CATV hardline (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Wed, 15 Jan 2014 11:53:42 -0500
by too kind The story about "molten" CATV cable sounds like someone connected it to the 115/230V AC mains. half you out of Here you go... <http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#0904> To
/archives//html/Towertalk/2014-01/msg00213.html (11,785 bytes)

123. Re: [TowerTalk] RG-149: 50 ohm/70 ohm - does it matter? (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sun, 15 Dec 2013 04:49:28 -0500
That's very close - the cause of the distortion is a non-optimum load line. Most of us are familiar with the idea of drawing a 'load line' on the characteristic Va/Ia curves for a tube amplifier. Ex
/archives//html/Towertalk/2013-12/msg00302.html (14,248 bytes)

124. Re: [TowerTalk] OWA Inventor? (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Fri, 13 Dec 2013 09:48:33 -0500
biggest easier with a edges That tradeoff isn't universally true. It may well be true for HF Yagis because of the relatively small number of design variables (element lengths and spacings) that are a
/archives//html/Towertalk/2013-12/msg00257.html (10,118 bytes)

125. Re: [TowerTalk] OWA Inventor? (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Thu, 12 Dec 2013 18:17:05 -0500
The idea of inserting an extra director very close to the Driven Element has been independently discovered several times. One of the first to specifically recognise that this extra director can help
/archives//html/Towertalk/2013-12/msg00229.html (8,482 bytes)

126. Re: [TowerTalk] SWR variations with power (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Tue, 05 Nov 2013 06:07:46 -0500
I'd agree with K9YC and N6RK that heating of the choke toroids is not the issue... but your remark about "RFI from 6m" raises a warning flag. A yagi on a tower should never be a particularly tough co
/archives//html/Towertalk/2013-11/msg00070.html (14,888 bytes)

127. Re: [TowerTalk] Fwd: Raising 25G with a helicopter (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Fri, 25 Oct 2013 23:46:13 +0100
This is how it should be done, with Swiss precision. <http://tx.mb21.co.uk/gallery/gallerypage.php?txid=840> These are photos of conversion of a British TV tower for digital TV. In Parts 1 through 4,
/archives//html/Towertalk/2013-10/msg00374.html (9,862 bytes)

128. Re: [TowerTalk] Interesting development (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Tue, 1 Oct 2013 13:58:20 +0100
went SteppiIR "home" It could have happened exactly as described. If the signal from the M0 station was arriving in a deep null in the vertical pattern of the higher antenna, then passive coupling w
/archives//html/Towertalk/2013-10/msg00003.html (9,374 bytes)

129. Re: [TowerTalk] Switching Multiple Rotors (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Thu, 5 Sep 2013 08:12:44 +0100
tiny the That's correct. Routeing the RF control signal along the coax will deliver far stronger signals than an over-the-air link, which wastes almost all the signal power in unwanted directions. I
/archives//html/Towertalk/2013-09/msg00074.html (9,554 bytes)

130. Re: [TowerTalk] Coax and control lines in same PVC (Steve Jones)-Option (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Tue, 18 Jun 2013 09:02:24 +0100
For remote control of a Beverage antenna selector, N4ZR has had good success with sending the 300MHz control signals out along the same coax that carries the incoming 160/80m signals. That same coax
/archives//html/Towertalk/2013-06/msg00270.html (11,751 bytes)

131. Re: [TowerTalk] How to apply lube to HDX589 (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sat, 15 Jun 2013 22:40:10 +0100
Sorry, Rick, photographs of the Versatower lock plate on the web seem hard to find. There are verbal descriptions on GM3WOJ's information pages, <http://www.qsl.net/gm3woj/latticetower.htm>. Scroll d
/archives//html/Towertalk/2013-06/msg00233.html (14,248 bytes)

132. Re: [TowerTalk] How to apply lube to HDX589 (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sat, 15 Jun 2013 18:48:27 +0100
would this side of Versatowers have only one locking device, a simple flapper plate at the top of the lowest section. The second section rests on this plate to take the strain off the winch cable af
/archives//html/Towertalk/2013-06/msg00223.html (10,344 bytes)

133. Re: [TowerTalk] How close to salt water is close enough? (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sat, 18 May 2013 20:39:14 +0100
There is a better way to use Coax-Seal, which the makers don't tell us because it uses only a very small amount per connector. The one good place to use Coax-Seal is to fill the small gap between the
/archives//html/Towertalk/2013-05/msg00228.html (11,189 bytes)

134. Re: [TowerTalk] Force 12 B-1/B-1S Baluns (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Wed, 15 May 2013 19:33:53 +0100
other antenna fatal It obviously isn't a fatal problem, but taping a coil of coax directly onto the boom will always UNbalance the antenna, more than balance it. If you use a ferrite balun for the b
/archives//html/Towertalk/2013-05/msg00202.html (9,074 bytes)

135. Re: [TowerTalk] Force 12 B-1/B-1S Baluns (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Tue, 14 May 2013 20:28:54 +0100
All true; and with a well designed ferrite-loaded choke it is exactly the opposite. A common-mode (choking) impedance of several kohms can easily be maintained across a 2:1 frequency ratio. The big a
/archives//html/Towertalk/2013-05/msg00178.html (10,311 bytes)

136. Re: [TowerTalk] Please Help Me Decide on a Tribander or Monobanders (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Sat, 20 Apr 2013 09:11:48 +0100
A fair point :-) But it's also fair to ask: "How long ago did your friends have problems, and which SteppIR antenna was that?" SteppIR have made many improvements in product quality over the past 12
/archives//html/Towertalk/2013-04/msg00261.html (11,672 bytes)

137. Re: [TowerTalk] InnovAntennas contact info (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Wed, 20 Mar 2013 15:28:44 -0500
itself to some zero If these be a warrants the Can it be that some parts of www.g0ksc.co.uk and www.innovantennas.com are failing to load in your browser? These are two different websites. g0ksc.com
/archives//html/Towertalk/2013-03/msg00284.html (11,987 bytes)

138. Re: [TowerTalk] InnovAntennas contact info (score: 104)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Wed, 20 Mar 2013 13:36:24 -0500
know much a largely The radiation pattern of a Yagi is determined by ALL of the elements, including the driven element itself. As a volunteer editor for the German-English VHF/UHF magazine DUBUS, I
/archives//html/Towertalk/2013-03/msg00271.html (13,986 bytes)

139. Re: [TowerTalk] Antenna Recommendation (score: 104)
Author: Jack White <m5pro@hotmail.com>
Date: Thu, 31 Jan 2013 20:35:47 +0000
I like many others was in this situation. After weighing up the pros and cons for what seemed like an age ie: price, performance, wind load, reliability, resale value should I upgrade, longevity and
/archives//html/Towertalk/2013-01/msg00355.html (9,306 bytes)

140. Re: [TowerTalk] The inertia of rest and the tilt over (score: 104)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 22 Jan 2013 21:02:44 +0000
I put my jack under one of the rails, so I am not trying to bend the brace between the rails. PE1BTX used a pair of air balloons from a truck suspension. These could be inflated to give the tower a
/archives//html/Towertalk/2013-01/msg00262.html (9,925 bytes)


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