Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 6 Oct 2005 17:44:58 +0200 (CEST)
qrz.com or do a Googol search to find pictures of those stations. < My XYL would want to know why we haven't got an antenna installation like those! 73 Peter G3RZP __________________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 6 Oct 2005 17:58:39 +0200 (CEST)
off. Add different lengths of RG-8, the swr varied from 2.5:1 to 5:1. It doesn't seem to be wx related. < I'd suspect common mode currents on the coax outer. Some ferrite rings or clip on sleeves, p
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 19 Oct 2005 12:45:17 +0200 (CEST)
One problem with the L network (single ended or balanced) is that working Q is a function of impedance transformation ratio. Q = ([Rp/ Rs] 1) Every time you double the working Q, you increase the los
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 26 Oct 2005 10:52:38 +0200 (CEST)
I found that the big problem with the GS065 was corrosion of the adjusting screws. I've just changed one after it had been up for 20 years: the adjusting screws (and the attaching screws) were rutsed
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 9 Nov 2005 15:16:36 +0100 (CET)
Further to K9YC's comments on ferrite toroids.. They would probably do OK as chokes with the coax wound around them. I've used old TV line output tranformer cores as 'line isolators' quite successful
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 15 Nov 2005 14:02:54 +0100 (CET)
I'd feed the tower as a vertical. Works for me - to the tune of 78 countries, including VK0 Heard Island. There'd be more if I was ever home from business travel! 73 Peter SM/G3RZP (this week) ______
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 27 Nov 2005 10:26:52 +0100 (CET)
I use 12mm diameter pre-stretched polyester rope, intended for marine use. It's UV proof and rated for just over 4000lbs. That's on a 60 foot crank up. No knots - they effectively half the strength.
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 5 Dec 2005 15:05:50 +0100 (CET)
Terminate the line with a pair of good solid strong insulators - the old fashioned 8 or 10 inch glass or ceramic for preference - and fix the cold ends of those to stout eye bolts attached to the hou
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 13 Dec 2005 21:09:24 +0100 (CET)
Back in 1986, FWIW, I went in for the Bermuda Contest. With 20m open in the afternoon GMT, I found that the 5 ele monobander at 62 feet was FB for the US West Coast, but a G5RV at 30 feet outperforme
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 13 Dec 2005 22:09:01 +0100 (CET)
know of one UK ham who made up a contraption with 2 inch diameter scaffold pipe and 3/8 square elastic. The pipe arms went into the ground and he had a winch arrangement to stretch the elastic.......
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 17 Dec 2005 16:13:18 +0100 (CET)
A downside to the Steppir over a log periodic if you happen to be the military is that it won't allow wide band systems or frequency hopping. If you don't need that facility, it must offer pretty goo
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 24 Dec 2005 10:48:06 +0100 (CET)
Do I gather from the discussion that crank up/foldover towers in the US are generally unguyed? Over here, guying is quite usual on a crank up: my 80 footer is rated to 120mph by the manufacturer when
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 24 Dec 2005 22:56:49 +0100 (CET)
Inquiring minds want to know< Jake, ' Solid state' provides a living for the XYL and myself - she teaches people how to use her company's software to design 'bit freak' (i.e. digital) integrated circ
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 27 Dec 2005 16:05:06 +0100 (CET)
I'd suggest loading the tower as a vertical. Especially if you have beam on top to provide top loading. For me, this approach beats the hell out of the dipole on 80, and goes beautifully on 160 - unl
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 29 Dec 2005 08:06:17 +0100 (CET)
The only times mine comes down is when there's antenna work to be done, or there's plenty of advance warning of major storm conditions. It lived through the 1987 and 1991 storms when the wind speeds
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 31 Dec 2005 09:40:49 +0100 (CET)
Adding to what Mike said: My UK made crank up/ fold over is rated by the manufacturer for 9.9 square feet of antennas at 120mph when guyed. It is rated for 70mph with 9.2 square feet when not guyed.
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 4 Jan 2006 11:16:03 +0100 (CET)
I found the 'EWE' remarkably good, and better than a rotatable tuned loop with 1 meter sides and 2 turns. 73 Peter G3RZP _______________________________________________ ______________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 5 Jan 2006 10:27:50 +0100 (CET)
<I have a lawyer/engineer friend who says that a patent only gives you the right to sue... it doesn't give you the means to do so.< The best use I've found for my patents is that they look good on a
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 7 Jan 2006 17:38:25 +0100 (CET)
Isn't polyethylene rather 'stretchy'? I think you need pre stretched polyester, as is used for sheets on yachts. It's got good UV resistance, too. 73 Peter G3RZP _____________________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 24 Jan 2006 10:24:09 +0100 (CET)
I gather that there's a beam providing top loading? if so, you can have fun things happening in the rotator. I had a 205BA providing top loading and a T2X rotator. The RF current through the capacity