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81. [Amps] TS-440S Update (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 15 Apr 2002 12:47:30 +0100; There are times when one has to wonder about technological 'progress' - or maybe I'm a bit too cynical. Some 'miracle' cures for every ill, such as ALC for example, do leave me a bit dubious. 73 Pete; /archives//html/Amps/2002-04/msg00356.html (8,072 bytes)
82. [Amps] TS-440S Update (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 15 Apr 2002 15:01:43 +0100; Hmm, I'm not sure that is the only answer. NFB, yes, (despite what the audiophools would have us believe!), but there are methods using transformer feedback which have certain advantages. Although an; /archives//html/Amps/2002-04/msg00359.html (8,678 bytes)
83. [Amps] TS-440S Update (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 15 Apr 2002 15:30:19 +0100; Something similar has been said about pencil and paper as a wondrous new non volatile low power storage medium! Many years ago, I worked for a guy who said that if you couldn't do it with a twin trio; /archives//html/Amps/2002-04/msg00362.html (7,989 bytes)
84. [Amps] RF Ground for 2nd Floor (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 16 Apr 2002 07:49:58 +0100; Interestingly, a 'power engineer' I knew who was heavily involved professionally in electrical installations for the supply company told me that he had had more than a few occasions where burying the; /archives//html/Amps/2002-04/msg00381.html (8,826 bytes)
85. [Amps] RF Ground for 2nd Floor (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 17 Apr 2002 07:36:48 +0100; A technique used by the police radio people in Northern Ireland (and maybe elsewhere) is to put a 2 inch diameter aluminium scaffold pole on top of the tower. That gets the hits and gradually erodes; /archives//html/Amps/2002-04/msg00397.html (8,141 bytes)
86. [Amps] Recommendation? (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 19 Apr 2002 07:08:00 +0100; .Circle M Ranch's trademark(s). Otherwise known in the industry as 'Batwing' 73 Peter G3RZP; /archives//html/Amps/2002-04/msg00465.html (7,502 bytes)
87. [Amps] Solid State HF amps and kits (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Fri, 19 Apr 2002 07:27:44 +0100; When you do the sums on the kVAR involved at 1500 watts, it's pretty awesome. Then when you consider the effects of SWR too - I normally figure on being able to operate into a 2:1SWR. One trick that; /archives//html/Amps/2002-04/msg00466.html (7,409 bytes)
88. [Amps] 240 VOLT SW (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 30 Apr 2002 07:49:25 +0100; switch in Look at Fair Radio. http://www.fairradio.com/ They have the 6 way tap switches from the BC375 for $3.95 each, 10 for $32. That should do it - you can leave every other position blank. 73 Pe; /archives//html/Amps/2002-04/msg00593.html (6,736 bytes)
89. [Amps] SV572 vs 811A (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 30 Apr 2002 11:52:07 +0100; I read somewhere that the 30L1 dvelopment 'happened' because some ham at Collins knocked up an amplifer with 4 811A tubes in in a S line case as a 'home office project', and it was seen at a time whe; /archives//html/Amps/2002-04/msg00594.html (7,719 bytes)
90. [Amps] SV572 vs 811A (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 30 Apr 2002 14:36:21 +0100; I know a number of teens that would cause less problem given car keys and whisky than would gov't bureaucrats given power! Just thank your lucky stars that you guys in the US haven't got anything lik; /archives//html/Amps/2002-04/msg00596.html (7,417 bytes)
91. [Amps] SV572 vs 811A (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 30 Apr 2002 15:51:32 +0100; and from knowing that Tupperware plastic boxes have a standardised size throughout Europe! (published in the Official Journal, too). 73 Peter G3RZP; /archives//html/Amps/2002-04/msg00600.html (7,322 bytes)
92. [Amps] SB-200 Problem (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 5 Mar 2002 08:49:54 -0000; I would be inclined to do the first sets of tests with a 50 ohm load on the output, and the transceiver connected to the input (transceiver in transmit, but delivering NO power). That way, the amp is; /archives//html/Amps/2002-03/msg00073.html (8,850 bytes)
93. [Amps] Blowers (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 5 Mar 2002 10:47:07 -0000; My sentiments,too, but a couple of years back, somebody here said that he'd worked at a broadcast station where the blower revs had been turned up and tube life went for a chop because of overheating; /archives//html/Amps/2002-03/msg00074.html (8,046 bytes)
94. [Amps] SB-200 Problem (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 5 Mar 2002 15:05:46 -0000; I wouldn't say 'never', but it's certainly a much modified impedance. The filter effect won't be that much of course, since it's only two octaves up. The load could be useful in helping stability at; /archives//html/Amps/2002-03/msg00086.html (8,027 bytes)
95. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 11 Mar 2002 08:42:41 -0000; One point about receive antenna directivity is the Murphy factor - the peak noise source is always in the same direction and polarisation as the wanted signal. 73 Peter G3RZP; /archives//html/Amps/2002-03/msg00223.html (7,897 bytes)
96. [Amps] Air Chimneys for 3-500Z and Anode Dissipation (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 11 Mar 2002 08:55:17 -0000; The classic problem comes with the heat reducing the spring tension which increases the resistance which increases the heat........ Admittedly, not with 3-500s, but with QY4-250 and QY4-400, which ha; /archives//html/Amps/2002-03/msg00224.html (8,238 bytes)
97. [Amps] 10 Meters (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 14 Mar 2002 07:45:02 -0000; This is the heart of the matter. There's no other radio service that so consistently runs with the low signal to noise and high signal to interference levels that the amateur service does. (I don't c; /archives//html/Amps/2002-03/msg00283.html (9,000 bytes)
98. [Amps] 10 Meters (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 14 Mar 2002 13:00:16 -0000; For some reason, too, actually giving a callsign seems to be unacceptable these days. YJ0AOW the other day didn't give his call in 23 QSO's, and he's not the only one...... The habit even seems to ha; /archives//html/Amps/2002-03/msg00293.html (8,553 bytes)
99. [Amps] Useful parts (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 14 Mar 2002 14:15:08 -0000; Has anyone ever tried using the microwave oven with a pulse position modulator (or even pulse width modulation) to make a high power 2.4GHz tx? Would appear to be a cheap approach: of course, the pow; /archives//html/Amps/2002-03/msg00295.html (7,259 bytes)
100. [Amps] Useful parts (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Thu, 14 Mar 2002 14:52:21 -0000; I remember the Rf Design magazine article. Didn't seem to get taken up. Injection locking might be a possibility, but I don't know how well it would work. Be interesting to see such a beast. Would no; /archives//html/Amps/2002-03/msg00298.html (7,000 bytes)

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