Mail Archive Search: <+from:Peter

Results:

References: [ +from:Peter_Chadwick@mitel.com: 967 ]

Total 967 documents matching your query.

41. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 07:57:33 +0100; One point about the spark gap surge arrestors is that the breakdown voltage is dependent upon the rise time of the applied voltage. For example, the 90volt Siemens types used for protecting telephone; /archives//html/Amps/2001-04/msg00377.html (9,912 bytes)
42. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 07:59:00 +0100; What for Rich? Is this a warning that you are going to pontificate rubbish yet again? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative; /archives//html/Amps/2001-04/msg00378.html (8,276 bytes)
43. [AMPS] EL-38 Tubes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 08:07:20 +0100; Bill asked: You can get data at: http://www.mif.pg.gda.pl/homepages/frank/index.html Probably the best replacement would be EL509 from Svetlana. I've always found that sweep tube amps do best with a; /archives//html/Amps/2001-04/msg00379.html (6,969 bytes)
44. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 11:03:10 +0100; Incidentally, whatever the advantages or disadvantages of using zener diodes to regulate the screen, if you are going to drive an amp from a TS2000, it wouldn't appear to matter what you do from the; /archives//html/Amps/2001-04/msg00382.html (9,763 bytes)
45. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 11:57:29 +0100; 23/64, while 13/32 of 1.0 earwigs is 1 woodlouse...... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesti; /archives//html/Amps/2001-04/msg00385.html (9,021 bytes)
46. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 19 Apr 2001 06:55:21 +0100; Only: "The radio is nicely styled and easy to to use......." "It is fitted with a bright, clear and easy-to-read display with an exceptionally wide viewing angle for an LCD." UK price is around ?1700; /archives//html/Amps/2001-04/msg00430.html (8,253 bytes)
47. [AMPS] Zener screen supplies (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 19 Apr 2001 07:19:21 +0100; I expect this only applies at HF, not VHF. But the question remains as to how long it takes for the capacitor to break down. Similar to the question on how long it takes for a semiconductor to break; /archives//html/Amps/2001-04/msg00431.html (8,049 bytes)
48. [AMPS] 3 phase transforers and single phase (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 19 Apr 2001 07:29:49 +0100; Bill asked: The model engineering people running 3 phase motors use either capacitive splits (so not true 3 phase) or inverters, or (a very few), motor generators. My inverter (for the mill and the l; /archives//html/Amps/2001-04/msg00432.html (8,426 bytes)
49. [AMPS] 3 phase transforers and single phase (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 19 Apr 2001 16:17:08 +0100; The inverter I've got is a 'pseudo sinewave' with, if I remember, 4 steps per half cycle. Of course, when feeding an induction motor without too much slip, it doesn't look too bad. Maybe the motor ge; /archives//html/Amps/2001-04/msg00441.html (8,388 bytes)
50. [AMPS] basic question about dipping the plate (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 25 Apr 2001 08:42:35 +0100; It depends on how you define resonance. A parallel tuned circuit can be defined as resonant when 1. XL = XC, OR 2. when the voltage across C is maximum OR 3. when the current through L is maximum OR; /archives//html/Amps/2001-04/msg00518.html (9,978 bytes)
51. [AMPS] basic question about dipping the plate (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 25 Apr 2001 11:48:05 +0100; I think that Mauri means that the 'equivalent XL and XC' are the values that exist because of the effects of resistance in either or both the capacitive and inductive branches. So we can say effectiv; /archives//html/Amps/2001-04/msg00521.html (9,249 bytes)
52. [AMPS] basic question about dipping the plate (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 25 Apr 2001 15:15:27 +0100; Agreed, Rich. I don't think you can get an L network to do an impedance transformation with XC = XL, unless (remember we're talking theoretically) the output load is either zero or infinity (dependin; /archives//html/Amps/2001-04/msg00526.html (9,040 bytes)
53. [AMPS] Triton - Glass tubes ?? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 30 Apr 2001 07:29:54 +0100; Not totally convinced that means that they do better spot welds, though! It might help avoid the more obvious mistakes. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: a; /archives//html/Amps/2001-04/msg00577.html (8,356 bytes)
54. [AMPS] k2riw 2m amp! (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 09:15:20 -0000; that the quality on SSB is so bad that describing it as a 'crap' would be flattering it. Rich is obviously used to quality, identifying the KW-1 as a Collins type number! They are beautiful, high cla; /archives//html/Amps/2001-03/msg00004.html (6,844 bytes)
55. [AMPS] IC-PW1 Acom2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 09:17:37 -0000; I think you mean '90 second warm up', not 90 minutes! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contestin; /archives//html/Amps/2001-03/msg00005.html (7,772 bytes)
56. [AMPS] IC-PW1 Acom2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 09:54:51 -0000; Well, nice for me if the competition had to wait so long! I am old fashioned, and have been working in the semiconductor industry too long. As a result, I prefer tube amplifiers. One advantage of the; /archives//html/Amps/2001-03/msg00007.html (8,491 bytes)
57. [AMPS] RE: IC-PW1 Acom2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 10:38:15 -0000; ?????????????? I am referring to damage to the amp caused by lightning inducing an electro magnetic pulse (EMP) into the antenna/power or control leads. The solid state amp is likely to be less robu; /archives//html/Amps/2001-03/msg00010.html (7,303 bytes)
58. [AMPS] IC-PW1 Acom2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 10:50:52 -0000; I think that certainly explains why! the high Q network reduces the EMP energy enormously, and of course, helps prevent intermodulation and cross modulation. But I expect modern amplifiers have plent; /archives//html/Amps/2001-03/msg00012.html (8,076 bytes)
59. [AMPS] IC-PW1 Acom2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Mar 2001 12:26:53 -0000; That can be the problem - protection can cost as much as the rest of the amplifier! Mauri is quite correct in what he says, and the longer term future is definitely all solid state. Again, Mauri is r; /archives//html/Amps/2001-03/msg00013.html (8,438 bytes)
60. [AMPS] Xray levels (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 12 Mar 2001 08:54:58 -0000; When I did the RF Radiation Hazard course, they said that you didn't need to worry for plate voltages under 15kV. On the other hand, for klystrons at 180kV, you did need to worry - big time! They lea; /archives//html/Amps/2001-03/msg00096.html (7,180 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]