Mail Archive Search: <+from:peter.chadwick@Zarlink.Com>

Results:

References: [ +from:peter.chadwick@Zarlink.Com: 335 ]

Total 335 documents matching your query.

41. [Amps] RMS Power (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 11 Nov 2002 14:34:17 -0000; I think the idea of calling it 'rms power' is to distinguish it from 'PEP' or 'Peak power', or from'average power'. In the latter case, it's obvious for a steady carrier, but the 'average' power outp; /archives//html/Amps/2002-11/msg00171.html (7,435 bytes)
42. [Amps] RMS Power (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 11 Nov 2002 14:48:39 -0000; rate I don't really know when this started, but I do remember a guy some 30 years ago who bought reject 3 watt AF amplifier devices from Plessey Semiconductors. These were 3 watts single tone. He sol; /archives//html/Amps/2002-11/msg00172.html (7,804 bytes)
43. [Amps] 4-400A Plate (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 11 Nov 2002 15:24:00 -0000; In the case of a tantalum anode tube, the glow means that the plate is hot enough to absorb gas - a few metals have this property - so tantalum anode tubes are meant to be run so hot. In any case, th; /archives//html/Amps/2002-11/msg00175.html (8,457 bytes)
44. [Amps] Output Safety Choke Value (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 15 Nov 2002 09:15:18 -0000; It is often said in amateur circles that the choke is there to provide a safety ground if the feed capacitor from the plate goes short circuit. In that case, the choke has to be pretty 'hefty' in tha; /archives//html/Amps/2002-11/msg00239.html (7,789 bytes)
45. [Amps] DC On tube filaments (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 14 Oct 2002 08:31:25 +0100; I believe the problem is metal migration - a well known phenomena in semiconductors. There, in order to maintain life at 150 deg C chip temperature, the maximum current density is about 2 to 4mA per; /archives//html/Amps/2002-10/msg00128.html (8,123 bytes)
46. [Amps] AL-1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 23 Oct 2002 13:18:52 +0100; The only reason for Murphy not striking at any particular time is that he's waiting for an even worse time instead! 73 Peter G3RZP; /archives//html/Amps/2002-10/msg00237.html (6,680 bytes)
47. [Amps] Glitch resistors (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 2 Sep 2002 08:33:01 +0100; So out of the following, which would you recommend? 1. 80 ohm, 100 watt carbon rod. About 1 inch diameter 12 inches long. Originally meant as low inductance RF load resistors. 2. 50 ohm, 100 watt wir; /archives//html/Amps/2002-09/msg00009.html (7,320 bytes)
48. [Amps] mounting a vac variable (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 9 Sep 2002 07:56:41 +0100; I assume that the drive mechanism is there. In that case, I've very successfully used ordinary electrolytic capacitor clamps, with thin (20 gauge) copper wrapped around the metal drive housing under; /archives//html/Amps/2002-09/msg00056.html (6,918 bytes)
49. [Amps] JAN CWL-803 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 11 Sep 2002 08:24:27 +0100; Osten asked about the 803. According to the abbreviated details in an older ARRL Handbook: Plate dissipation 125 watts. Max plate volts 2000 Screen dissipation amx 30 watts Screen volts max 600 Max f; /archives//html/Amps/2002-09/msg00071.html (7,136 bytes)
50. [Amps] X-ray dangers from amplifiers? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 30 Sep 2002 08:18:35 +0100; Alan asks: Now the big TWTs running at 150kV are another matter, but you don't find many of those in ham stations! 73 Peter G3RZP; /archives//html/Amps/2002-09/msg00277.html (7,515 bytes)
51. [Amps] Dual 8877 Alpha 77S final query (score: 1): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Aug 1 12:32:41 2003; AND that's going to be an electricity bill! 73 Peter G3RZP; /archives//html/Amps/2002-09/msg00288.html (6,699 bytes)
52. [Amps] Powering 400w mobile amplifier... (score: 1): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Aug 1 07:50:46 2003; It might be a good idea before you start to check the vehicle manufacturer's recommendations on radio fits. Certainly over here, they've had recommendations for maximum power of radios in the vehicle; /archives//html/Amps/2002-09/msg00414.html (6,871 bytes)
53. [Amps] Commander-II 144MHz amp PSU woes (and Tempo 2002A) (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 12 Aug 2002 08:13:38 +0100; Last year, I measured some unused 5% carbon comp resistors that were still in the full military packaging they had been placed in when new in 1964 (complete with NATO stock number on them). That's ea; /archives//html/Amps/2002-08/msg00115.html (8,022 bytes)
54. [Amps] PiL Current ratings? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 15 Jul 2002 16:19:56 +0100; The application of Kirchoff's Law says that, too. However, when sizing the wire, skin resistance should not be forgotten. Additionally, Rich's advice on allowing some cooling air flow is well worth f; /archives//html/Amps/2002-07/msg00204.html (7,017 bytes)
55. [Amps] Muffin Fans and hot exhaust (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 22 Jul 2002 16:37:34 +0100; Am I correct in thinking that hot air is less dense? How does this affect the ability of a given fan at a given rpm to move the weight of air? I am assuming that it's the weight of the air that matte; /archives//html/Amps/2002-07/msg00396.html (9,189 bytes)
56. [Amps] Muffin Fans and hot exhaust/2 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 23 Jul 2002 11:37:30 +0100; This is particularly true for fans with ball, as opposed to plain (sleeve) bearings. Sleeve bearings do need slightly more complex lubrication procedures, though. When the heatsink has been machined; /archives//html/Amps/2002-07/msg00417.html (6,986 bytes)
57. [Amps] Muffin Fans and hot exhaust/3 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 23 Jul 2002 13:40:43 +0100; Ah! A new meaning to the word 'machining'. Bonding is not 'machining' - leastways, not as any of my engineering books understand the word. But how do you measure that flatness? 73 Peter G3RZP; /archives//html/Amps/2002-07/msg00420.html (7,424 bytes)
58. [Amps] Muffin Fans and hot exhaust/3a (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 23 Jul 2002 13:44:45 +0100; Sorry, Alex, your use of English is very different to mine. 73 Peter G3RZP; /archives//html/Amps/2002-07/msg00422.html (8,128 bytes)
59. [Amps] RE: The Great Equalizer (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 23 Jul 2002 15:48:22 +0100; Also Adios to self training in RF, experimentation, operating skill and interest, and any ability to provide emergency communciations. Just super CB! 73 Peter G3RZP; /archives//html/Amps/2002-07/msg00432.html (7,576 bytes)
60. [Amps] Ceramic coil formers etc. (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 26 Jul 2002 08:32:06 +0100; Undoubtedly, Ian, you have a point - this is why there was Frequentite, Isolantite, Stupakoff, to name but a few. There were a number of special ceramics developed for HF use, and some 'half and half; /archives//html/Amps/2002-07/msg00489.html (7,280 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]