Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 7 Nov 2006 09:14:55 +0100 (CET)
I find that an electric hot air gun, as used for paint stripping, is ideal. This heats it up enough you can then move to a 40watt Weller with great success. Peter G3RZP ______________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 8 Nov 2006 18:03:13 +0100 (CET)
Plus is a wide impedance match range Minus is that this range is achieved by having a working Q dependent on the antenna impedance, which can lead to high losses under some circumstances. 73 Peter G3
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 29 Nov 2006 14:59:48 +0100 (CET)
Put a 50 ohm load on the balun output. Using low power, measure the SWR at the input. If it's around 1:1, it's a 1:1 balun. If it's around 4:1, it's 4:1 balun. 73 Peter G3RZP ________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 29 Nov 2006 15:02:18 +0100 (CET)
Heat, hit with hammer, attempt to twist. Keep doing this until they part. Cursing might ease your feelings a bit during the exercise, which can be quite lengthy - it won't separate the tubes, though
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Wed, 29 Nov 2006 23:47:34 +0100 (CET)
I've done this a couple of times, and had no problems wih galling when twisting the tubing - but YMMV. Meantime, there's two bits of a 205BA boom lying along side the hedge in my garden waiting for t
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 30 Nov 2006 10:07:57 +0100 (CET)
minimally I just might be able to get them apart.< If they were driven together, I don't have a lot of hopes, although you may be lucky. A lot will depend if there's been any corrosion. Still, when I
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Thu, 4 Jan 2007 16:43:54 +0100 (CET)
A hot air gun, as used for paint stripping, is excellent for heating the body of the 259 up fast. Then a 40 watt Weller is adequate. No problems at all. 73 Peter G3RZP _______________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 16 Jun 2007 07:06:46 +0200 (CEST)
An old 'rule of thumb' for link coupled tuners is the coil should tune with about 1 pF of capacity for every metre of wavelength. This gives the ability to get up to about 5000 ohms with a reasonable
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 17 Jun 2007 06:49:39 +0200 (CEST)
Chuck asked: Unless you're QRP, I'd go for around 2 inch diameter or so. Wire size depending on power. For QRO, use thin tube - model engineer suppliers or refrigeartion or A/C suppliers may be a sou
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 30 Jun 2007 11:36:06 +0200 (CEST)
I've even used straight electrolytics in rotator boxes. Because you aren't running it for very long, it doesn't get hot enough to be a problem. My T2X has had a 50 + 50uF 250 volt dual electrolytic w
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Fri, 5 Oct 2007 23:13:37 +0200 (CEST)
As I understand it, W6AM used telephone/power poles without a problem. Now it may be that having rhombics strung up at the top level modified tyhe vibration/vortex shedding as compared to Yagis. I wo
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sat, 6 Oct 2007 08:15:24 +0200 (CEST)
how to use our slide rules and use our heads to move the decimal point a lot.< That was we learnt in the radio course, not the applied mechanics!!!!! Some of us still use a slide rule on occasion - t
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 8 Oct 2007 14:47:45 +0200 (CEST)
"Yup", they all agreed, "that's right." "Now I've seen everything.", said the young fella, just shaking his head... While I didn't let on, I was pleased to still be able to do something I haven't don
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 29 Oct 2007 06:19:23 +0100 (CET)
I had the same problem with a T2X and stainless bolts - they are 1/4 -20. I did use single coil lock washers, too. My answer, which has served for over 20 years now, is an aluminium plate, 1/16th inc
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 29 Oct 2007 16:28:02 +0100 (CET)
How good is the Loctite at preventing the usual "stainless steel in aluminium" corrosion problem? Bearing in mind the T2X casting is aluminium. There might be some advantage in fitting studs to the b
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 5 Nov 2007 16:22:16 +0100 (CET)
You have considerably more faith in semiconductor reliability than I have, and I've only worked in the semics industry for 28 years. 73 Peter G3RZP _______________________________________________ ___
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 5 Nov 2007 18:51:25 +0100 (CET)
than LED's (0) due to simple burn out in the equipment. < The incandescents I've replaced in the last 20 years were ones run without surge protection in Yaesu equipment, and some in a boatanchor rece
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 5 Nov 2007 19:01:15 +0100 (CET)
Try the book 'Physical Design of Yagi Antennas' by David B. Leeson, W6QHS. ISBN 0-87259-381-9, published by ARRL. 1st editon 1992. Dave is now W6NL. 73 Peter G3RZP. __________________________________
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 5 Nov 2007 21:48:35 +0100 (CET)
infant mortality or induced by external causes?< 1 probably external: no infant mortalities. While a 6L6G my father bought in 1936 for the then equivalent of 50 cents is still going strong as a seri