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

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341. [AMPS] ssr's in qro amps (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 28 Jun 2000 08:52:45 +0100; It's interesting that back in the 'good ole days', (i.e. AM and CW only) removing the HV from the tx when in receive was not uncommon. Some marine tx's did not, but that was because they had to be ab; /archives//html/Amps/2000-06/msg00461.html (9,550 bytes)
342. [AMPS] Choke input supply (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 28 Jun 2000 10:22:41 +0100; Yes, but......you need to make sure that the two DC resistances are the same, or the current will divide unequally. 'Identical' chokes may well have different DC resistances. They need to be mounted; /archives//html/Amps/2000-06/msg00464.html (7,347 bytes)
343. [AMPS] ssr's in qro amps (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 28 Jun 2000 13:53:58 +0100; Well, if you go back far enough, there was keying the AC supply..........usually when running the power oscillator with raw AC on the plates.....must have been a pretty broad band signal. 73 Peter G3; /archives//html/Amps/2000-06/msg00470.html (8,273 bytes)
344. [AMPS] ssr's in qro amps (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 28 Jun 2000 15:43:26 +0100; Back in the '60s, we had an old Marconi tx at the radio club. It ran 6 807's in push parallel, driven by 2 in parallel, and modulated by 4 in push-pull parallel. That had a VOCSU 'Voice Operated Carr; /archives//html/Amps/2000-06/msg00475.html (8,016 bytes)
345. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 07:20:47 +0100; One not too expensive device is the Almost All Digital Electronics L-C meter. It's cheap, pretty accurate, and comes as a kit that took me under an hour to build. It is worth changing the 5 volt regu; /archives//html/Amps/2000-05/msg00016.html (8,385 bytes)
346. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 14:22:55 +0100; the Previously, Rich has defined resonance as the frequency where XL = XC. In low Q networks, this isn't necessarily so, and further, the only definition that holds correctly for both series and para; /archives//html/Amps/2000-05/msg00019.html (9,236 bytes)
347. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 16:31:09 +0100; That is yet another definition of resonance. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/2000-05/msg00025.html (8,772 bytes)
348. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 2 May 2000 17:00:29 +0100; Call it what you will - that 'resonant frequency' is a different one to that achieved by other definitions. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@cont; /archives//html/Amps/2000-05/msg00027.html (8,505 bytes)
349. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 3 May 2000 06:36:47 +0100; Rich, you sound like Humpty Dumpty - 'Words mean what I want them to' First you defined resonance as where XL = XC. Now it's where the dip meter finds it. For circuits with low Q, they aren't the sam; /archives//html/Amps/2000-05/msg00034.html (8,945 bytes)
350. [AMPS] Practical PI Nets (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 4 May 2000 06:52:26 +0100; Larry, Are you taking into account the output capacitance of the tube? That means that the tank on its own will look inductive; the complete circuit will look resistive. 73 Peter G3RZP -- FAQ on WWW:; /archives//html/Amps/2000-05/msg00041.html (8,034 bytes)
351. [AMPS] QSK5 Unit (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 22 May 2000 15:22:08 +0100; Although higher voltages are available, they aren't cheap. I'm not totally convinced of the reliability under ham conditions at any power either - I once lost the PIN in the XYL's 2 m 25 watt mobile; /archives//html/Amps/2000-05/msg00255.html (8,473 bytes)
352. [AMPS] 12.5CM transmitter using microwave oven tube query (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 24 May 2000 09:37:24 +0100; Bob asked: tubes? Some years back, there was an article in Communications Quarterly, if my memory serves, on making an ATV tx from an oven. As I remember it, it was FM, and being wide band, stability; /archives//html/Amps/2000-05/msg00268.html (7,739 bytes)
353. [AMPS] SELL: 8877 RF Deck Components (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 26 May 2000 09:30:00 +0100; Sounds more like one of those mediaeval devices, like a ducking stool........ Of course, a 'clamp' is also something you store potatoes and turnips and swede (rutabaga) in...so why not anodes? 73 Pet; /archives//html/Amps/2000-05/msg00293.html (7,203 bytes)
354. [AMPS] Emtron DX1 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 26 May 2000 09:40:55 +0100; Unfortunately, they are also noisy. Quiet blowers producing lots of air flow have large wheels, go slowly, but don't necessarily work well under the back pressure requirements (I guess if it was big; /archives//html/Amps/2000-05/msg00294.html (8,692 bytes)
355. [AMPS] SB-200 very strange behavior (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 30 May 2000 09:47:26 +0100; Don't agree there Phil - there always seems to be some new problem creeping out of the woodwork. And Murphy keeps up to date with technology! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/a; /archives//html/Amps/2000-05/msg00337.html (7,537 bytes)
356. [AMPS] Dope question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 25 Apr 2000 17:20:52 +0100; Phil asks; You can. As the PEP is 4 times the carrier power for 100% modulation, a linear rated at 1600w PEP out should only be driven to 400 watts of carrier. You also need to make sure that the rat; /archives//html/Amps/2000-04/msg00133.html (8,503 bytes)
357. SV: [AMPS] Inrush Current (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 26 Apr 2000 07:58:13 +0100; heater I presume you mean 'ground to RF'. Interestingly enough, back in the dawn of pre-history when the the old Command transmitters were designed, they used a Hartley oscillator at only a few watts; /archives//html/Amps/2000-04/msg00152.html (9,501 bytes)
358. SV: [AMPS] Inrush Current (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 26 Apr 2000 15:08:38 +0100; Do I understand you as advising a bifilar filament choke, and tying one side of the heater and cathode together? That stops the heater cathode insulation getting punctured with a B+ to ground short;; /archives//html/Amps/2000-04/msg00154.html (9,030 bytes)
359. [AMPS] Misc. Oscillations (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 6 Mar 2000 11:52:09 -0000; happened? One reason I saw advanced ( I can't remember where, but it was a respectable source) was that the grounded lightning conductor provided a degree of discharge of the atmosphere, thus prevent; /archives//html/Amps/2000-03/msg00226.html (9,215 bytes)
360. [AMPS] Design of Plate RF Choke (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 6 Mar 2000 12:05:07 -0000; band. Rich, you didn't add: ' Every one comes with a $50 bill wrapped it around for packing.' 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Adm; /archives//html/Amps/2000-03/msg00227.html (7,396 bytes)

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