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101. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 26 Mar 2005 15:45:09 +0000; yes no -- Dr. David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if you live in Essex http://www.southminster-branch-line.org.uk/ _______________________________________________ Amps maili; /archives//html/Amps/2005-03/msg00578.html (10,732 bytes)
102. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 26 Mar 2005 17:03:40 +0000; The confusion seems to be more about average power and RMS power. The average voltage of a sine wave is 0. Some of us know that. Some don't seem able to appreciate it. The top of this page http://www; /archives//html/Amps/2005-03/msg00581.html (15,357 bytes)
103. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 00:04:59 +0000; I must agree with your Gary, that is well written, in a way that is pretty easy for anyone with a very modest knowledge to understand. You don't need calculus knowledge as you do to fully understand; /archives//html/Amps/2005-03/msg00590.html (10,389 bytes)
104. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 02:31:58 +0100; Well you are not amongst the 99%, but the 1%, as most people are not aware that you only need to sample at twice the *bandwidth* of the signal, and not twice the highest frequency. Ask many engineers; /archives//html/Amps/2005-03/msg00594.html (10,000 bytes)
105. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 13:33:56 +0100; John and Mary Powell wrote in a different thread: I'm not keen on a thread being split up for no good reason. Someone started this thread with the title 'Measuring RF Power' and so why ZL1BHQ starts; /archives//html/Amps/2005-03/msg00599.html (12,935 bytes)
106. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 16:32:56 +0100; It's just childishness to hang on to an argument if you know you are wrong. There is nothing wrong with not knowing that RMS power and mean power were the same. I have freely admitted that I'd never; /archives//html/Amps/2005-03/msg00602.html (15,304 bytes)
107. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 18:00:28 +0100; I would have at one time thought they were totally worthless to in the individual that obtained them. But I see on the TV recently of someone writing a book about some diet. She had no medical traini; /archives//html/Amps/2005-03/msg00605.html (11,583 bytes)
108. Re: [Amps] meter shielding (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 23:33:15 +0100; One thing to note is that feedthrough caps only work if they have a source impedance that is sufficiently high. If the source impedance is low, then they are ineffective. The figures you see for atte; /archives//html/Amps/2005-03/msg00616.html (8,770 bytes)
109. Re: [Amps] Solid State HF High power linear amps (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Mon, 28 Mar 2005 12:13:41 +0100; Same here There are still made. There are numerous manufacturers still in business, with Eimac the best known, and probably the largest. One issue I see is that for very high power you are going to n; /archives//html/Amps/2005-03/msg00625.html (9,130 bytes)
110. Re: [Amps] Measuring RF Power (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Mon, 28 Mar 2005 18:19:28 +0100; Looking back over the archives I see it has come up before as you say, although not very often. The ratio of discussions on parasitic oscillations must outnumber it 1000:1, with very much the same ar; /archives//html/Amps/2005-03/msg00631.html (10,867 bytes)
111. Re: [Amps] RMS VS Peak VS Average power and the Bird 43 wattmeter (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Tue, 29 Mar 2005 06:42:50 +0100; My first thought is to wonder whether the electrical output terminals of the element are capable of responding quickly? The element will no doubt consist of a diode to rectify the RF, a resistor to d; /archives//html/Amps/2005-03/msg00657.html (10,515 bytes)
112. [Amps] Useful chip for power supply and relay sequencing (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Thu, 31 Mar 2005 14:48:01 +0100; Maxim have a couple of interesting chips (MAX6870 MAX6871), which are designed for monitoring and sequencings requirements in multi voltage systems. You could perhaps use one to check the anode suppl; /archives//html/Amps/2005-03/msg00743.html (7,908 bytes)
113. Re: [Amps] 4CX350 distortion products? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 02 Apr 2005 18:55:35 +0100; There are spec sheets on my web site http://www.g8wrb.org/ for several of the 4CX250 and 4CX350 series tubes. There are huge differences. There are of course various models, but briefly one might sta; /archives//html/Amps/2005-04/msg00039.html (7,841 bytes)
114. Re: [Amps] Coherent Laser parts info? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Mon, 04 Apr 2005 21:54:33 +0100; Coherent are still very much in business, so I expect they will tell you (at least you might get an unofficial answer anyway). My experience of their engineers has been very good, although we paid se; /archives//html/Amps/2005-04/msg00087.html (9,660 bytes)
115. Re: [Amps] [Moon-net] 2C39 (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Thu, 07 Apr 2005 08:44:07 +0100; There's are data sheets for the 2C39A (both Eimac and Philips),2C39B , 2C39WA and 3CX100A on my web site http://www.g8wrb.org/, but not for the BA variant. -- Dr. David Kirkby, G8WRB Please check out; /archives//html/Amps/2005-04/msg00134.html (7,747 bytes)
116. Re: [Amps] ebay and amps (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Tue, 12 Apr 2005 20:23:00 +0100; eBay's insurance is next to useless, as I found out to my cost. Read why here: http://groups.google.co.uk/groups?hl=en&lr=&frame=right&th=71cc420fe4fc6571&seekm=3837D313.9D3F1BA%40medphys.ucl.ac.uk#l; /archives//html/Amps/2005-04/msg00230.html (10,069 bytes)
117. Re: [Amps] article in Nature, modified Aurora via HF tspa (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 16 Apr 2005 02:19:55 +0100; An intereting paper. I downloaded the PDF from the Nature site, where of course you can see the graphs and pictures. It does give some credability to the people like Rich who has said he has observed; /archives//html/Amps/2005-04/msg00304.html (8,536 bytes)
118. Re: [Amps] article in Nature, modified Aurora via HF tspa (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 16 Apr 2005 15:16:36 +0100; But if you rely on S-meter calibration, you can't draw any valid conclusions. PERIOD. Rich has given a more detailed analysis, based on the use of calibrated attenuators. I still feel he is wrong, an; /archives//html/Amps/2005-04/msg00308.html (8,517 bytes)
119. Re: [Amps] Led display problem (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Tue, 19 Apr 2005 00:46:04 +0100; Personally I don't think bargraphs are as useful as analogue meters, but, if that is what you want, there are few options. 1) You can easily use a small transformer to power the circuit. Rectify the; /archives//html/Amps/2005-04/msg00380.html (8,001 bytes)
120. [Amps] Help - anyone in UK with accurate frequency standard? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Wed, 20 Apr 2005 01:49:20 +0100; Sorry this is off-topic, but I'm hoping someone reading this might be able to help. I have (or soon will have) an HP 5370B time/interval/frequency counter, like this http://www.tucker.com/java/jsp/do; /archives//html/Amps/2005-04/msg00406.html (8,934 bytes)

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