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121. [Amps] FW: Re: tank coil heating (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 16 May 2006 12:22:46 +0200 (CEST); == Chuck asks: One problem you can have is being able to get thick enough wire on to the core. At 1500 watts, you can have a lot of current in that coil, so you need a hefty conductor. You also need; /archives//html/Amps/2006-05/msg00108.html (7,939 bytes)
122. [Amps] Historical question-probably OT (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 26 May 2006 20:45:00 +0200 (CEST); At Dayton, I got a 1960 ARRL Handbook ( got to update the station!) for my collection. It has an interesting HF amplifier in it, using a pair of 4X250, (NOT 4CX) running, it is claimed AB2 passive gr; /archives//html/Amps/2006-05/msg00391.html (7,627 bytes)
123. Re: [Amps] multi-tube amplifiers (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 26 May 2006 20:54:40 +0200 (CEST); Years ago, I designed a marine transmitter that had 3 6146B's in parallel. The available output power at a given IMD level ranged over about 3dB, because of variations in exciter IMD, power supply vo; /archives//html/Amps/2006-05/msg00392.html (8,225 bytes)
124. Re: [Amps] Historical question-probably OT (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 26 May 2006 22:23:13 +0200 (CEST); This ARRL Handbook is in pretty good shape - the cover is a bluey green. But it does go back to the days when a certain degree of technical knowledge was required, and the '20 year appliance operator; /archives//html/Amps/2006-05/msg00397.html (7,743 bytes)
125. Re: [Amps] 813's (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 31 May 2006 10:58:25 +0200 (CEST); Not only did Collins (amongst many others) run 813s in the horizontal position, there was even a Collins civil aircraft TX of the late 40s, early 50s which used an 813 at an angle of about 60 degrees; /archives//html/Amps/2006-05/msg00541.html (8,108 bytes)
126. Re: [Amps] Step Start And Transformer Surge Current (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 31 May 2006 11:39:44 +0200 (CEST); Surely one advantage of step start, regardless of transformer type, is that you reduce the surge charging current into the filter capacitors? Presumably, with choke input and a suitable transformer m; /archives//html/Amps/2006-05/msg00546.html (7,556 bytes)
127. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 31 May 2006 18:30:29 +0200 (CEST); Provided that the grid parasitic tuned circuit is resonant at a higher frequency than the anode parasitic tuned circuit, the amplifier will be stable. Unless Terman got it wrong........ This suggests; /archives//html/Amps/2006-05/msg00560.html (9,157 bytes)
128. Re: [Amps] 8877 stability in PAs TSPA (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 1 Jun 2006 21:16:04 +0200 (CEST); What has your shed done to deserve an electric chair? Or is it a different type of electric chair to that used in Sing Sing? If so, how does your shed use an electric chair? 73 Peter G3RZP __________; /archives//html/Amps/2006-06/msg00008.html (7,050 bytes)
129. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 1 Jun 2006 21:31:44 +0200 (CEST); Looking back through my old ARRL Handbooks, I see that the parasitic suppressors varied somewhat. Some were the parallel L-R combination used generally today, others were an actual trap ( which seems; /archives//html/Amps/2006-06/msg00010.html (7,951 bytes)
130. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 3 Jun 2006 12:36:38 +0200 (CEST); I wonder if the carbon comp resistor value change is due to absorbed moisture. I would expect moisture to send the value down, not up, which is what one normally sees. The other year, I took a 4k7, 1; /archives//html/Amps/2006-06/msg00052.html (8,901 bytes)
131. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Jun 2006 10:26:26 +0200 (CEST); close to resonance. Low-pass Pi-networks resonate a bit lower than the operating freq and high-pass Pi-networks resonate above it.< If it isn't resonant i.e. volts and amps are in phase, then you won; /archives//html/Amps/2006-06/msg00083.html (9,355 bytes)
132. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Jun 2006 10:45:59 +0200 (CEST); In my innocence, something puzzles me. Is the indexing on the SB220 bandswitch very weak, or are the capacitors very stiff? I would have thought that the resistance to turning of the bandswitch would; /archives//html/Amps/2006-06/msg00084.html (8,565 bytes)
133. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Jun 2006 19:47:53 +0200 (CEST); Resonance is best defined as the voltage and current applied to the circuit are in phase: thus what happens in any branch is immaterial. Using that definiton, you have a definition that applies to bo; /archives//html/Amps/2006-06/msg00106.html (9,274 bytes)
134. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Jun 2006 19:59:39 +0200 (CEST); years, with or without a parasitic suppressor, and an arc occurs< Personally, I'd be more inclined to suspect something in the tubes - although it is perfectly possible that the parasitic suppressor; /archives//html/Amps/2006-06/msg00108.html (8,824 bytes)
135. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 5 Jun 2006 08:49:54 +0200 (CEST); Only when X = 0. However, because resonance is defined as X = 0 for a circuit, claiming X = 0 for all circuits means the term resonance can be misleading. It's a bit like saying 'all dogs have four l; /archives//html/Amps/2006-06/msg00111.html (8,372 bytes)
136. Re: [Amps] resonance (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 5 Jun 2006 20:20:16 +0200 (CEST); The only definition that holds up for both parallel and series cases (and multi branch cases, too) is that the applied V and I are in phase, i.e. the input to the circuit looks resistive. This defini; /archives//html/Amps/2006-06/msg00132.html (7,448 bytes)
137. Re: [Amps] emtron dx-1??? for a couple hundred bucks? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 6 Jun 2006 08:45:30 +0200 (CEST); at 1KW was $0.80 a watt. The best< My homebrew pair of 4-250A can give a kW and cost me 10cents US per watt. I wonder how many cents per watt Rich's homebrew wooden box amp cost? Not much, I would gu; /archives//html/Amps/2006-06/msg00154.html (8,327 bytes)
138. Re: [Amps] SB-220 Plate Tuning Capacitor (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 6 Jun 2006 18:03:56 +0200 (CEST); 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00167.html (7,887 bytes)
139. Re: [Amps] SB-220 Plate Tuning Capacitor (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 7 Jun 2006 12:51:42 +0200 (CEST); at sea-level. At 390v peak output into 50-ohms, the actual potential across open bandswitch contacts is c. 2600v-pk.< And what is the manufacturer's rating? For some reason I don't understand, things; /archives//html/Amps/2006-06/msg00191.html (7,424 bytes)
140. Re: [Amps] copper strap (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 8 Jun 2006 15:58:41 +0200 (CEST); If the stuff isn't nice and flexible, it can be useful to anneal it. Get it red hot, and let it cool - usually, dropped into cold water, to save time. Then clean it up with steel wool. If you're usin; /archives//html/Amps/2006-06/msg00226.html (6,979 bytes)

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