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

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101. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 15 Jan 2001 13:28:07 -0000; I've done a fair number of reviews myself. One item I went to some trouble doing was internal spurs in receivers - which are rarely mentioned. Trouble is, measurement techniques differ - even in prof; /archives//html/Amps/2001-01/msg00359.html (10,848 bytes)
102. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 15 Jan 2001 16:46:49 -0000; No they don't. See the paper by Danielli of UCLA in IEEE (I think is it was Circuits and Systems) back some ten years or so. They are predictable, although it's complicated to do it. They tend to be; /archives//html/Amps/2001-01/msg00365.html (9,767 bytes)
103. [AMPS] Receiver tests in the past........ (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 07:50:20 -0000; Tom, go wash your mouth out! You're not supposed to ask awkward questions like that! Generally, the close in (2kHz) IMD specs are set by in channel IMD requirements, where AGC is supposed to prevent; /archives//html/Amps/2001-01/msg00373.html (8,070 bytes)
104. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 07:51:37 -0000; Tom, how do you define Blocking Dynamic Range? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com P; /archives//html/Amps/2001-01/msg00374.html (7,707 bytes)
105. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 14:21:57 -0000; Not entirely so - if the bandpass filtering is Gaussian in transfer function, no ringing occurs on application of a step function. Generally, Gaussian filters aren't a lot of use for our 'narrow' poi; /archives//html/Amps/2001-01/msg00378.html (9,982 bytes)
106. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 15:18:50 -0000; Bet they do. It's case of 'How much do they ring?', and in a good filter, (by which I mean one designed to fit the system requirements) it's not noticeable. Does the MP1000MKV spike? The only one I'v; /archives//html/Amps/2001-01/msg00383.html (9,229 bytes)
107. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 15:50:32 -0000; So it's a sort of mixture of phase noise performance and gain compression. Needs a good signal generator to measure - or do it at 21.4MHz minus a few kHz with a 21.4MHz filter cleaning up the sig gen; /archives//html/Amps/2001-01/msg00390.html (8,516 bytes)
108. [AMPS] Receiver tests in the past........ (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 16:01:07 -0000; is that a tube PTO, running relatively high power? They tend to be pretty good. One of the quietest signal generators I've come across is the pre war Marconi TF144G. That has a triode with about 200v; /archives//html/Amps/2001-01/msg00391.html (7,575 bytes)
109. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 17 Jan 2001 07:58:47 -0000; I did a lot of work on IMD in crystal filters back in the mid 1970's. The ferrite transformer business I found interesting, since I was never able to find a filter where the ferrite transformer was t; /archives//html/Amps/2001-01/msg00404.html (10,038 bytes)
110. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 17 Jan 2001 10:37:24 -0000; Differential group delay does occur in one variety of digital filter - if I remember correectly, the FIR (Finite Impulse Response) design has differential group delay, while the IIR (Infinite Impulse; /archives//html/Amps/2001-01/msg00407.html (10,299 bytes)
111. [AMPS] Two XFMR in parallel (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 17 Jan 2001 13:16:56 -0000; I agree totally with Phil. One thought occurs though: if each transformer feeds its own bridge rectifier, you could parallel the resulting DC outputs. In order to get proper load share between the tr; /archives//html/Amps/2001-01/msg00411.html (8,921 bytes)
112. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 08:33:07 -0000; That generally (but not always) goes with heat in the core, too. Of course, tiny cores can saturate at powers so low you don't notice the heat. I worked on a project once with transformers that didn'; /archives//html/Amps/2001-01/msg00452.html (8,930 bytes)
113. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 08:44:44 -0000; Well, I did say 'If I remember'! I'm still dubious about all this 'bit freak' stuff, anyway! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administ; /archives//html/Amps/2001-01/msg00453.html (7,898 bytes)
114. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 08:47:52 -0000; I know some antenna professionals who think that, too. I think it's because there's two definitions in the text books for radiation resistance - one that's right all the time, and one that's right un; /archives//html/Amps/2001-01/msg00454.html (8,524 bytes)
115. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 12:07:22 -0000; There was an article by Ulrich Rohde in Ham radio about time, in which there was front end described using an XF9B. I wrote to Ulrich, pointing out that there was a problem with the filter: he wrote; /archives//html/Amps/2001-01/msg00457.html (8,355 bytes)
116. [AMPS] Re: Two XFMRs Parallel... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 19 Jan 2001 11:30:14 -0000; What about Scott connection? or is that getting quadarture voltages from 3 phase? the memory is fading.......K5PRO can probably answer..... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ; /archives//html/Amps/2001-01/msg00490.html (8,289 bytes)
117. [AMPS] Clipperton L amplifier (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 22 Jan 2001 08:05:04 -0000; The original comment was about shielding the screen supply...... hardly applicable to 3-500Zs. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admin; /archives//html/Amps/2001-01/msg00550.html (9,068 bytes)
118. [AMPS] Fertility (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 30 Jan 2001 11:19:59 -0000; It may be purely coincidental, but back in the 60's, it was noticeable that all the engineers in high power transmitter lab at Marconi's had daughters - and that had tended to be the case for some ye; /archives//html/Amps/2001-01/msg00705.html (8,122 bytes)
119. [AMPS] tube brand question... IMPORTANT (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 31 Jan 2001 09:02:47 -0000; Silly question, I guess, but where are the Cetron 572s made? RCA show neutralisation on grounded grid 811s, too. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@con; /archives//html/Amps/2001-01/msg00752.html (6,890 bytes)
120. [AMPS] Fertility+ (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 31 Jan 2001 09:23:16 -0000; tvi - yes. causes women? Moot point - as I met my XYL at the radio club shortly after she got her licence! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contestin; /archives//html/Amps/2001-01/msg00753.html (6,802 bytes)

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