Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 26 Dec 2009 17:43:22 +0000
But like any insulator, it still have some conductivity. According to http://en.wikipedia.org/wiki/Self-ionization_of_water the self-ionisation of water gives a conductivity of 0.055 micro Siemens pe
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 27 Dec 2009 03:39:28 +0000
There's plenty of tube info at http://www.g8wrb.org/ and now thanks to MegaGate, who are hosting that for free, it is quite fast now. (For about 9 months I had to host it on my own computer network,
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Thu, 14 Jan 2010 03:50:14 +0000
IIRC PET 100's are not like BNCs. PET 100s screw on. MHV and SHV are more BNC-like, though they don't mate with BNC of course. Dave _______________________________________________ Amps mailing list A
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 16 Jan 2010 12:38:28 +0000
Having looked over KK5DR's site, it would appear that all pages should be linked under: http://www.kk5dr.com/stories.htm I too have chosen my words carefully! Dave G8wRB _____________________________
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 17 Jan 2010 05:16:54 +0000
It's amusing how much time the guy has devoted to writing about things he knows little about. It would be a bit like me writing about brain surgery, concrete, glues, flower arranging, or anything els
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 17 Jan 2010 19:49:12 +0000
It was a lot worst - I have cleaned it up a bit myself. But there are diagrams showing the spacing as being 0.1 lambda, then the text says 0.25 lambda. Nothing about physical length being less than e
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Thu, 21 Jan 2010 13:14:59 +0000
With all due respect, using SO239/PL259 seems about the silliest suggestion I have ever heard. I'm not saying the insulation may be insufficient on some models made in the USA when they are mated, bu
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 02 Feb 2010 12:58:47 +0000
I recall reading somewhere that in the RAE exam (or whatever it might be called now in the UK), X % of the candidates did not know how to wire a 13 A plug. The pass mark was Y %. I can't recall X or
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 02 Feb 2010 17:00:11 +0000
As a school kid, I used to work in Tandy, before I went of to do an EE degree. I recall one guy coming in to by some fuses - we sold them in packs of 3. A few days later, he come back, and bought som
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Fri, 12 Feb 2010 17:55:30 +0000
The theory is non-trivial, and unless you have a reasonable understanding of complex maths, you will struggle to *really* understand this. The closest I've seen for an explanation was in some old RSG
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Tue, 23 Feb 2010 09:52:34 +0000
It would depend on what your standing current is. If the standing current is X Amps, and your HT is 4000 V, then the 'resting plate watts' as you call it would be 4000 * X. Pop over to http://www.g8w
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 06 Mar 2010 02:53:25 +0000
That is not correct. The *vector* sum of them will be 240 V, but due to the inductance of the primary, the voltage across the primary and the voltage across the resistor, as measured on a DVM, do not
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 06 Mar 2010 22:05:27 +0000
Yes, I know that, but the poster referred to the use of DVMs. I was not disputing a DVM could do this, but it would have to be a laboratory instrument, rather than a handheld unit. __________________
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 15 Mar 2010 22:41:07 +0000
I'd double-check the relative permittivity of PTFE - I don't think it is as high as 10. I don't say this reference can be trusted, but http://www.microwaves101.com/encyclopedia/permittivity.cfm says
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Mon, 29 Mar 2010 03:29:22 +0100
A 5 kW tube run at 1.5 kW could be made more linear than something run closer to it's maximum. As the tube ages, the drop of emmision would be less of an issue than with a tube run closer to it's max
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Fri, 02 Apr 2010 16:11:18 +0100
looking at the threads on LCR meters, I see * LCR meter * LCR mteter * More LCR mters and meaurements. * lcr meter * LCR meter/review They seem pretty much related, and even copy/paste bits from the
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 03 Apr 2010 08:58:53 +0100
Which is rarely the case. For example, the question about "Powering up after several years" was changed to "Powering up 3K". While the original poster had a Henry 3K Premier, the fact remains that th
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sat, 03 Apr 2010 15:21:40 +0100
Sorry, you are correct Jim, the > sign is used. Why the switch to ## I will never know. Dave _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 04 Apr 2010 00:04:32 +0100
If you look at the header, you will see I am using Thurderbird, though not on any common operating system. One can certainly create filers, and I assume one can turn sound on, though I've never fanci
Author: "Dr. David Kirkby" <david.kirkby@onetel.net>
Date: Sun, 04 Apr 2010 00:11:18 +0100
I don't know how you arrive at 1 W, but just by looking at it one should be immediately possible to see it will be 1.5 W. No need for a calculator. dave ______________________________________________