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

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21. [AMPS] Properties of plastics at 10 GHz (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 13 Aug 1998 15:34:07 +0100; Absorption peaks can be very narrow. That's why I asked for data at 10GHz, and did not do as some suggested and stick some plastic in the microwave oven (2.4 GHz). The reason all microwave ovens use; /archives//html/Amps/1998-08/msg00118.html (8,864 bytes)
22. [AMPS] Bleeder Resistor (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 14 Aug 1998 13:10:41 +0100; I would be tempted to put two resistors in parrallel. If one goes, you have a backup. Obviously the larger the resistor(s), the longer it takes to discharge to a safe value. If you start with 4 kV, a; /archives//html/Amps/1998-08/msg00132.html (8,097 bytes)
23. [AMPS] G8WRB's response to Boyd Fulbright's false accusations. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 14 Aug 1998 17:34:14 +0100; Hi all, I hope no one minds me using the AMP's newgroup for this purpose, but Boyd Fulbright (he has used the callsigns W6DSB and N6DMF) has sent two emails to this group (and one to an individual),; /archives//html/Amps/1998-08/msg00137.html (13,883 bytes)
24. [AMPS] 3-phase fan motor - help please (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 25 Aug 1998 09:10:29 +0100; The domestic mains in the UK is single phase, not two phases. The live and neutral have a voltage between them that's 230 V RMS single phase (325 V peak) - having said that, most places I've checked; /archives//html/Amps/1998-08/msg00197.html (9,064 bytes)
25. [AMPS] High isolation RF amplifers. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 28 Aug 1998 12:31:51 +0100; Does anyone know how one goes about designing a wide-band RF amplifer (small signal, say +10 dBm max output) that has high isolation between output and input (ie |S12| is small) ?? Whilst I could eas; /archives//html/Amps/1998-08/msg00233.html (7,114 bytes)
26. [AMPS] Free conduction cooled tubes. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 28 Aug 1998 12:39:03 +0100; I have two or three amplifer modules (ripped out, so only useful for parts). The only possibly useful component is an RCA 8828 conduction cooled tube with base. I have the data on the tubes, and if m; /archives//html/Amps/1998-08/msg00234.html (7,124 bytes)
27. [AMPS] Wanted - data sheet on Eimac Y808 tube. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 13 Jul 1998 15:47:56 +0100; Does anyone have any data on the Eimac Y808. Its conduction cooled, and as far as I am aware, is very similar to the 4CX250B - except the method of cooling. I believe it was supplied to the Cival Ava; /archives//html/Amps/1998-07/msg00065.html (6,965 bytes)
28. [AMPS] Biasing Solid State Amplifiers to Linear Operation (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 13 Jul 1998 16:57:01 +0100; There was a discussion about biasing of FET amps a week or two ago. I just spotted this, while looking for something else, which sounds relevant, and interesting to many hams. Its an application note; /archives//html/Amps/1998-07/msg00066.html (7,386 bytes)
29. [AMPS] UTC Type 837, 180 pF, 5%, 5kV capacitor (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 17 Jul 1998 15:43:48 +0100; I have a cap (doorknob type), marked: TYPE 837 180PF +/- 5% 5KV U.T.C. MADE IN U.K. 8626 Does anyone have any specs on it, or an address for UTC ?? I want to know if it will do as a DC blocking capac; /archives//html/Amps/1998-07/msg00099.html (6,964 bytes)
30. [AMPS] Wanted - info on BR1196F tube (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 20 Jul 1998 13:42:39 +0100; Does anyone know of the BR1196F tube, made I think by EEV ?? It looks to me like a triode, intended for grounded grid use, and judging by the anode size, looks about 3-5 kW dissipation. If anyone doe; /archives//html/Amps/1998-07/msg00104.html (6,778 bytes)
31. [AMPS] Re: Measuring airflow - additions. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 21 Jul 1998 10:39:59 +0100; I mentioned 5 ways of measuring flow, but perhaps I should have eleaborated a bit on one or two of these: Method 1). Pressure goes up with the square of flow, so if the pressure you measure is 2x tha; /archives//html/Amps/1998-07/msg00116.html (7,356 bytes)
32. [AMPS] Please help - data on RCA CR304 high voltage rectifier needed. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 22 Jul 1998 12:13:18 +0100; Does anyone have any data on the RCA high voltage diode, type CR304 ??? Another ham and I disagree about the specs. He says it is 24 kV PIV, but there are 10 diodes in series, each shunted by a capac; /archives//html/Amps/1998-07/msg00129.html (7,719 bytes)
33. [AMPS] MLA-2500 Help (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 29 Jul 1998 17:35:26 +0100; With the caps okay the off-load voltage will be equal to the peak transformer volltage (less a few volts for diode drops). With no capacitance, the voltage will be a series of half-rectified sine wav; /archives//html/Amps/1998-07/msg00203.html (8,470 bytes)
34. [AMPS] Bird Wattmeter Error on 160 Meters (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 01 Jun 1998 10:53:08 +0100; As a student I worked on calibrating Bird 43's. 10% of FSD is not an unusual error. In fact, I purchased a 70 cm slug for myself, and checked it (at 432 MHz) the day after buying it. It was out of sp; /archives//html/Amps/1998-06/msg00001.html (8,143 bytes)
35. [AMPS] Solid State 1kw amp (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 03 Jun 1998 12:02:02 +0100; You probably know this, but Motorola have produced lots of application notes on using their devices for this sort of application. Eg AN758, 'A Two Stage 1kW Solid-State Linear Amplifier'. This uses 8; /archives//html/Amps/1998-06/msg00037.html (9,195 bytes)
36. [AMPS] kW solid state amps (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 05 Jun 1998 16:54:16 +0100; That book was available as a freebie from Motorola. I ordered a copy from their web site. However, I think the freebie offer is now discontinued, but you could try your luck .... G8WRB -- FAQ on WWW; /archives//html/Amps/1998-06/msg00073.html (7,727 bytes)
37. [AMPS] Need Millen HV connectors (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 05 Jun 1998 16:56:17 +0100; Both the MHV and the SHV (somewhat better than MHV in my oppinion) are available from Suhner. They are both rated to 5 kV - even when unmated. G8WRB -- FAQ on WWW: http://www.contesting.com/ampfaq.ht; /archives//html/Amps/1998-06/msg00074.html (7,893 bytes)
38. [AMPS] HV Transformer Secondary Resistance (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 17 Jun 1998 15:59:11 +0100; I suspect the transformer too. It sounds too light, and too resistive. I believe the following argument proves this. 3.3 kV@ 1 A is 3300 W if run into a purely resistive load - upon which most, but n; /archives//html/Amps/1998-06/msg00185.html (9,432 bytes)
39. [AMPS] Wanted: Info on Jennings J1HT 57 capacitor (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 24 Jun 1998 12:48:17 +0100; I have a doorknob cap, Jennings J1HT 57, 200 pF, 7.5 kV, 10 %, N750, that I am contemplating using in an amp. Does anyone know the thread of the tapped holes on the ends of these ?? I expect its an A; /archives//html/Amps/1998-06/msg00226.html (7,083 bytes)
40. [AMPS] Equalising voltages on series connected electrolytics. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 25 Jun 1998 11:04:49 +0100; I'm in the process of putting together an amp (with integral psu) that uses a conduction cooled tube. My hope is to avoid any cooling fan, but it is a tall order, with an anode dissipation of nearly; /archives//html/Amps/1998-06/msg00228.html (8,187 bytes)

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