Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 4 Feb 2006 18:29:16 +0100 (CET)
A method I've used is to carefully cut the rope with scissors and heat seal the end with a blow torch. Then the rope is fitted around a thimble (is this what you mean by a D ring?) and 'whipped' into
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 10 Feb 2006 18:57:01 +0100 (CET)
Geoff asked: I have successfully used 2 by 2 by 1/4 inch angle iron, and 1-1/2 inch diameter galvanised pipe with a 1/4 inch wall. Let the sections all sit on something solid. 73 Peter G3RZP What is
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 10 Feb 2006 20:56:30 +0100 (CET)
A really good way is to block the tower (I prefer steel to wood myself) and then get someone else to do the climbing! But it should be suitably blocked that there's no tension on the cables. 73 Peter
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 11 Feb 2006 13:21:02 +0100 (CET)
K4FMX said: <A grounded tower is NOT less likely to be hit by lightning. Actually a grounded tower is a little more likely to be hit than a non grounded one.> Somewhere, some years back, I remember s
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 12 Feb 2006 13:01:24 +0100 (CET)
At one time, lightning arrestors with radio active tips were used, the idea being that the extra ionisation would attract the lightning bolt to the arrestor rather than teh building inteneded to be p
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 10 Mar 2006 09:44:49 +0100 (CET)
honest and fair.< I'll second that proposal. 73 Peter G3RZP _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 24 Mar 2006 10:40:34 +0100 (CET)
As Gary said, L-C filters are a better way to go. I'd design bandpass filters for each band. There are various programs around that will design a filter for you, although they can come up with awkwar
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 2 Apr 2006 10:20:07 +0200 (CEST)
My expereince has been (with both those rotators) that for a reason I can't explain, they end up full of filthy black dust, and the balls corrode. When I have occasion to take either tower down (whic
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 1 May 2006 14:55:37 +0200 (CEST)
Noise pick up on long ground leads can be reduced by shielding them. This is a well known technique in professional EMC (and electronic security - TEMPEST) circles. The shield is connected to ground
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 1 May 2006 20:13:24 +0200 (CEST)
extent that some are going out of business rather than putting up with it. < This seems to apply across the Western world these days. While one can understand environmental concerns, one has to wonde
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 13 Jun 2006 10:19:45 +0200 (CEST)
What about the non-magnetic stainless steels? 73 Peter G3RZP _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contestin
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 13 Jun 2006 17:01:27 +0200 (CEST)
Red, So in an Austenitic stainless steel, the only factor (other than frequency) affecting skin depth is the resistivity, and in that respect, stainless steel will be no different to any other non-ma
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 6 Jul 2006 10:37:40 +0200 (CEST)
The advantage of silver soldering is that it happens at around red heat, and you're less likely to get burning of the copper or steel. The last issue of NCJ had a good article on silver soldering, al
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 7 Jul 2006 10:00:56 +0200 (CEST)
Solder will melt when high current goes through it long before the conductor melts.< May be true for 'soft' solder - tin/lead alloys, melting at around 230 deg C. Silver solder - 'hard' solder' - is
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 9 Jul 2006 17:45:57 +0200 (CEST)
One point that may need watching in these environmentally sensitive, PC days. Anything with cadmium that could possibly leach into the ground/ ground water over here is a positive 'no-no'. It's very
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 1 Aug 2006 21:36:01 +0200 (CEST)
Versatower in 80 Km/hr winds. < And me - unguyed, anyway. The heavy duty one certainly is. I have the 4 section heavy duty one, which I've ended up having at 62 feet because I can't get the guys far
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 22 Aug 2006 22:15:23 +0200 (CEST)
The one I saw (and this was about 33 years ago, so I don't remember all the details) was three winding type balun on a piece of ferrite rod about 4 inches or so long and around 1/2 inch diameter. Fro
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 8 Sep 2006 07:13:47 +0200 (CEST)
In the UK, some of them have tried stealing the copper overhead catenary from the railways - even when it's live at 25kV! Some learnt and now they short the line to ground first..... A guy I worked w
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 8 Sep 2006 12:20:04 +0200 (CEST)
that was always getting stolen.< Part of that was that a lot of the lead was very old - first half 19th century or earlier - and so contained a high proportion of silver. Newer lead is better refined
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 9 Sep 2006 09:19:30 +0200 (CEST)
How much more loss is one likely to get from using galvanised wire for radials? My feeling is 'not much', and probably not measurable in an amateur context. But what do others think? 73 Peter G3RZP P