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References: [ +from:davek@medphys.ucl.ac.uk: 88 ]

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1. [Amps] Re: [Moon-Net] Looking for GPS-module to keep PC-clock correct. (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Thu, 24 Oct 2002 12:26:37 +0100; I can't talk too much for Microsoft Windoze software, but under Unix at least it is quite possible to arrange the ntp software to either: 1) Get and set the time when you dial up only. This has the s; /archives//html/Amps/2002-10/msg00247.html (10,260 bytes)
2. [Amps] Bird 1000H slug adjustment? (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Wed, 30 Oct 2002 12:35:15 +0000; I don't know for sure, but that sound like it could be a Macom part. http://www.macom.com/ If so, it might be possible to get one, or at least a data sheet -- PLEASE NOTE: If this message was sent to; /archives//html/Amps/2002-10/msg00314.html (8,588 bytes)
3. [Amps] Meter Faces (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Wed, 30 Oct 2002 12:44:03 +0000; I used CorelDraw, measured the dimensions with a ruler, and drew lines in the right place. With CorelDraw you can rotate a line by x degrees, so if like me your meters had an arc of 100 degrees, you; /archives//html/Amps/2002-10/msg00315.html (8,373 bytes)
4. [Amps] NEED PLATE VOLTAGE 5KV METER (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Mon, 23 Sep 2002 17:00:54 +0100; I'd be careful if you do intend scaling any meters for use with high voltages by external multiplier resistors. Should the meter go open circuit for any reason, it puts 4 kV on one of the terminals.; /archives//html/Amps/2002-09/msg00206.html (8,493 bytes)
5. [Amps] X-ray dangers from amplifiers? (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Mon, 30 Sep 2002 12:29:16 +0100; I just spoke to a professor in my department (medical physics), whose speciality is x-rays. He says below 10 kV, he would have no concerns, even when I said the anode current would be several amps. 2; /archives//html/Amps/2002-09/msg00278.html (9,205 bytes)
6. [Amps] Personal insults. (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Mon, 08 Jul 2002 14:35:11 +0100; Is it really necessary for so many people to make such a large number of personal insults about other subscribers on this reflector ? I used to subscribe to 'amps' many years ago, then unsubscribed s; /archives//html/Amps/2002-07/msg00119.html (7,709 bytes)
7. [Amps] Muffin Fans and hot exhaust (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Mon, 22 Jul 2002 10:25:07 +0100; As someone else has said, fans work better when pushing air, rather than pulling it. Assuming a local air pressure of 760 mm of mercury, the greatest pressure drop a fan can possibly produce when suc; /archives//html/Amps/2002-07/msg00391.html (8,741 bytes)
8. [Amps] Muffin Fans and hot exhaust/2 (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Tue, 23 Jul 2002 14:28:51 +0100; One manufacturer of hard drives (Fujitsu if memory servers me correct) has produced what has been billed as a silent drive. Clearly motors can be made very quite. I'm not aware of how to reduce wind; /archives//html/Amps/2002-07/msg00427.html (10,069 bytes)
9. [Amps] Low-noise high-voltage power supplies. (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Thu, 06 Jun 2002 10:35:30 +0100; Some of you might be interested in the following technique, that I see mentioned in a professional electronics journal: P. C. D. Hobbs, "Ultra-Quite High Voltage Source", IEEE Transactions on Instrum; /archives//html/Amps/2002-06/msg00037.html (8,672 bytes)
10. [Amps] "S" parameter (score: 1): Author: davek@medphys.ucl.ac.uk (Dr. David Kirkby); Date: Mon, 17 Jun 2002 09:08:24 +0100; I'd be vary wary of using 'S' parameters, which by definition are small signal parameters. -- Dr. David Kirkby, Senior Research Fellow, Department of Medical Physics, University College London, 11-20; /archives//html/Amps/2002-06/msg00121.html (7,642 bytes)
11. [AMPS] Beryllium in 2C39's and 4CX250fg's? (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 02 Oct 1998 15:14:20 +0100; I dont think either the 4CX250B or the 2C39A have BeO in them, so can be disposed of easily. I think the hazard labels refer to the high-voltages and the heat these things generate (ie they could bur; /archives//html/Amps/1998-10/msg00011.html (9,401 bytes)
12. [AMPS] X-rays from tubes. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 06 Oct 1998 09:26:36 +0100; I once asked some colleagues of mine, who are radiation physicis (all with PhDs), specialising in the use x-ray's in medicine, if there are any possible risks with a tube running at 5kV. Everyone agr; /archives//html/Amps/1998-10/msg00033.html (7,172 bytes)
13. [AMPS] Meter Shunt Calculation (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 06 Oct 1998 10:55:58 +0100; The meter you have has a full scale voltage of V=IR=50x10^-6*1085 = 0.05425 V (I would stick to Ohms, Volts and Amps, and forget about using uA, mA or kOhms) Your current shunt needs to take 0.3 - 0.; /archives//html/Amps/1998-10/msg00037.html (8,778 bytes)
14. [AMPS] Meter Scale (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 12 Oct 1998 13:41:40 +0100; I've done this using CorelDraw (version 5 I think), rather than anyfreebie software, but my experiences might be helpful. I should state its often possible to get early versions of Coreldraw for free; /archives//html/Amps/1998-10/msg00114.html (9,867 bytes)
15. [AMPS] Phase stability of coax cables (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 16 Oct 1998 10:50:10 +0100; Does anyone know of any references (either academic or manufacturers), on the phase stability of coax cables with temperature ? Someone I work with is measuring time delays, to uncertainties of less; /archives//html/Amps/1998-10/msg00213.html (6,889 bytes)
16. [AMPS] Cheap RF power sensor chip. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 19 Oct 1998 10:30:47 +0100; The AD8313 is apparently a new chip from Analog Devices, and is an RF power sensor, useable from 100MHz to 2.5 GHz, with 65 dB dynamic range. The default input is -65 dBm to 0 dBm (about 0.3 nW to 1m; /archives//html/Amps/1998-10/msg00281.html (7,440 bytes)
17. [AMPS] FET Wanted (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 04 Sep 1998 11:28:12 +0100; Its available from Farnell here in the UK, or at least was in the April 98 catalogue, which is the only one within 1 foot of the top of the rubbish pile on my desk. I believe Farnell is known as some; /archives//html/Amps/1998-09/msg00057.html (8,191 bytes)
18. [AMPS] YC156 (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 28 Sep 1998 11:02:35 +0100; Eimac have told me that the YC156 is identical, except for some tests performed at Eimac, to the 3CPX5000A7 (note the P -its a pulsed version). In fact they sent me a 3CPX5000A7 data sheet, and wrote; /archives//html/Amps/1998-09/msg00312.html (7,849 bytes)
19. [AMPS] 3rd order IMD driver/final (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 30 Sep 1998 09:20:54 +0100; To calculate exactly this, you would need to know the phase relationships of the intermodulation products, as the two 3rd order products will combine as a vector, not a scalar. In principle, a poor T; /archives//html/Amps/1998-09/msg00332.html (8,482 bytes)
20. [AMPS] Propeties of plastics at 10 GHz (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 12 Aug 1998 11:03:02 +0100; Sorry this is not stictly about amps, but I guess someone here might know the answer. We have a student working on using a 10 GHz transmitter (burgler alarm type, using a 10GHz Gunn diode) and detect; /archives//html/Amps/1998-08/msg00107.html (8,485 bytes)

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