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101. [AMPS] re 4-250 A (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 18 Jul 1997 15:16:00 +0100; Rich, I didn't make it at all clear. It's a funny filament arrangement, in that there is a 5 - 0 - 5 volt filament xfmr, with the two fils in series across it, with the centre point of the two fils c; /archives//html/Amps/1997-07/msg00125.html (7,825 bytes)
102. [AMPS] arcs (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 18 Jul 1997 15:55:00 +0100; in Rich, do you think it possible that the increase in voltage at LF is due to the fact that at low frequencies, the arc gets the chance to extinguish during the zero crossing, while at HF, the plasm; /archives//html/Amps/1997-07/msg00128.html (7,652 bytes)
103. [AMPS] re:4-250A (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 18 Jul 1997 16:37:00 +0100; Rich comments; configuration. Rich, there's a body of opinion that doesn't agree with you. For example, see the curves of IMD against grid volts in The Care and Feeding of Power Grid Tubes. My copy i; /archives//html/Amps/1997-07/msg00131.html (8,628 bytes)
104. [AMPS] 4-250s etc (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 25 Jul 1997 12:38:00 +0100; Hi guys, I think Rich is rather extending my comments on grid current. I do not say that more grid current is better, merely that, IN A SUITABLY DESIGNED SYSTEM, grid current to certain amounts is no; /archives//html/Amps/1997-07/msg00208.html (8,710 bytes)
105. [AMPS] re: IMD Measurement (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 28 Jul 1997 09:44:00 +0100; Rich, What receiver IF bandwidth do you use for these tests? 73 G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@conte; /archives//html/Amps/1997-07/msg00254.html (6,708 bytes)
106. [AMPS] Linear Amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 28 Jul 1997 09:47:00 +0100; Can someone answer a naive question, please? What is the difference between audio amplification and linear RF amplification? Don't both require a linear amplifier, with the same transfer characterist; /archives//html/Amps/1997-07/msg00255.html (7,913 bytes)
107. [AMPS] IMD Measurement (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 28 Jul 1997 13:58:00 +0100; By tuning the rx away LF of the carrier for a USB xmission by 3.6KHz, do you mean that the carrier frequency of the rx is 3.6KHz away, and is the rx in USB or LSB? (all for a transmitted USB signal ); /archives//html/Amps/1997-07/msg00258.html (6,775 bytes)
108. [AMPS] linear amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 28 Jul 1997 14:00:00 +0100; Rich, transformer. amplifiers in So what about push - pull RF amplifiers? Can you explain exactly what you mean by 'coherent' and 'non-coherent' waveforms? 73 Peter G3RZP -- FAQ on WWW: http://www.co; /archives//html/Amps/1997-07/msg00259.html (8,271 bytes)
109. [AMPS] RE:Linear Amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 29 Jul 1997 09:12:00 +0100; Rich will doubtless forgive me when I say that I find this an interesting and unusual definition of 'coherent' and 'non-coherent' waveforms. It certainly isn't the definition used in such journals a; /archives//html/Amps/1997-07/msg00269.html (8,127 bytes)
110. [AMPS] out of band (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 29 Jul 1997 14:53:00 +0100; Interesting point, in that according to ITU regs, occupied bandwidth is the bandwidth where 99% of the energy is concentrated, and in our licence 99% of the power has to be within the allocated band.; /archives//html/Amps/1997-07/msg00275.html (7,614 bytes)
111. [AMPS] linear amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 29 Jul 1997 15:46:00 +0100; it used relatively connect Which shows how inaccurate English can be as a language - Rich means one thing, I mean another, and we are both correct within our meanings. But if we talk about amateur r; /archives//html/Amps/1997-07/msg00279.html (8,733 bytes)
112. [AMPS] splatter (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 10 Jun 1997 11:07:00 +0100; Hi guys, Been following the discussion for some time. I'll start by being controversial - when you run grid current in AB1, it's not AB1 anymore, it's AB2. AB1 is defined as 'no grid current', so you; /archives//html/Amps/1997-06/msg00150.html (12,697 bytes)
113. [AMPS] splatter (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 10 Jun 1997 17:20:00 +0100; Rich: Have a look in The care and Feeding of Power Grid tubes: there's a set of curves of IMD against input as you get into grid current. Provided that the grid (and screen, if applicable) stay at co; /archives//html/Amps/1997-06/msg00157.html (10,126 bytes)
114. [AMPS] splatter etc (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 12 Jun 1997 09:51:00 +0100; Carl said: >Getting even others to join in would be enjoyable; Peter is a pleasant Carl, you've never met me, or you wouldn't say that!! Rich asks why Eimac, Svetlana etc don't suggest regulated supp; /archives//html/Amps/1997-06/msg00196.html (8,550 bytes)
115. [AMPS] AB1/2 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 12 Jun 1997 12:40:00 +0100; Hi guys transistors. virtually Secondary breakdown is a funny thing, and you can't always rely on the curves in the data sheet.. Quite a few years ago now, John, GW4FRX did an article in RadCom (repr; /archives//html/Amps/1997-06/msg00199.html (9,680 bytes)
116. [AMPS] splatter (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 16 Jun 1997 10:25:00 +0100; Tom, I think that the confusion on 'maximum plate current at zero grid volts' occurs because the statement should say ' maximum plate current in the RF cycle flows at at zero grid volts.' The RCA Tub; /archives//html/Amps/1997-06/msg00225.html (10,881 bytes)
117. [AMPS] AB1/2 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 16 Jun 1997 17:01:00 +0100; Tom, OK, I see what you mean. I made the unwarrantable assumption that one automatically drives the grid up to zero volts to get the most swing - but you don't have to, although that seems to be the; /archives//html/Amps/1997-06/msg00231.html (7,962 bytes)
118. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 16 Jun 1997 14:49:00 +0100; Rich comments;- a Then my spectrum analyser is a liar. I get better linearity in AB2 from the 4-250s than in AB1 - probably because of the IMD cancellation with grid current, as stated by Bruene, and; /archives//html/Amps/1997-06/msg00232.html (9,458 bytes)
119. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 17 Jun 1997 09:32:00 +0100; Joe, KM1P asks: apart I'd say 'it all depends'. If you want to evaluate your entire SYSTEM under two tone test conditions (and I'd say that's a useful, but not an infallible guide), then that's a goo; /archives//html/Amps/1997-06/msg00242.html (10,215 bytes)
120. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 17 Jun 1997 13:28:00 +0100; Tom said in respect of noise testing: The original paper was in Marconi Instrumentation, sometime in 'the early 70's. Whether or not there's a library that has them, I don't know. Marconi Instrumenta; /archives//html/Amps/1997-06/msg00244.html (10,343 bytes)

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