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301. Re: [Amps] Pi-L values (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 2 Sep 2006 20:45:39 -0400; Ken, You are on the right track. Then that is what it should be. It is quite possible to have that value in a Pi-L. Then they allowed for the stray C in their design, which is what we should expect.; /archives//html/Amps/2006-09/msg00047.html (8,500 bytes)
302. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 4 Sep 2006 19:12:52 -0400; 1.) Every circuit has R in the L and in the C branch. The inductor is especially problematic for component Q limitations 2.) Resonance has several equally correct or commonly used definitions 3.) Re; /archives//html/Amps/2006-09/msg00083.html (8,475 bytes)
303. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 5 Sep 2006 05:00:08 -0400; I have a newer Agilent FFT spectrum analyzer, and it is certainly correct on it. Mine has the optional fast ADC (option 101) high bandwidth FFT and the FFT function only works to 10MHz. The FFT is p; /archives//html/Amps/2006-09/msg00092.html (9,116 bytes)
304. Re: [Amps] bandswitch wiper connection (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 5 Sep 2006 11:41:48 -0400; Voltage breakdown. That's almost always the weakest spot. Why? The best place for the wiper contact is loading cap in any network. No, but the extra tank components that are shorted do. 73 Tom _____; /archives//html/Amps/2006-09/msg00100.html (7,116 bytes)
305. Re: [Amps] SPAM (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 6 Sep 2006 18:02:33 -0400; Don't know if it is related but for some reason amps is coming in on an email address I haven't subscribed to "amps" on. That's pretty weird. It just started doing that today. 73 Tom _______________; /archives//html/Amps/2006-09/msg00133.html (7,212 bytes)
306. Re: [Amps] NOS 4CX1000A test and reconditioning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 8 Sep 2006 20:35:09 -0400; I worked at three stations and consulted for dozens more and none of them had the filaments on all the time. What I've seen agrees with what you have seen. 73 Tom ___________________________________; /archives//html/Amps/2006-09/msg00146.html (8,117 bytes)
307. Re: [Amps] amp tubes (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 9 Sep 2006 14:20:44 -0400; Hi Mike and Carl, I wonder what Carl's amplifier plate current is? The "Svetlana" 572B didn't have any more gain than any other 572 I tested. It actually had a bit less gain. With Cetron tubes my AL5; /archives//html/Amps/2006-09/msg00155.html (9,175 bytes)
308. Re: [Amps] amp tubes (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 10 Sep 2006 21:14:22 -0400; Will, Since you made calculations, you must have known the core material used. How did you learn the type of core material Heath used? How did you know the core material used in the other transforme; /archives//html/Amps/2006-09/msg00179.html (7,738 bytes)
309. Re: [Amps] 572B bias FL2100 (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 11 Sep 2006 14:45:31 -0400; Actually that relay speed up circuit has nothing to do with the Svetlana mod. The Svetlana mod in the standard FL2100 (not the later 2100Z) converts a NOMINAL 15 volt dc supply to around 30 volts by; /archives//html/Amps/2006-09/msg00184.html (9,041 bytes)
310. Re: [Amps] Fw: Step Start on a 3KA Amp (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 21 Sep 2006 09:07:59 -0400; Hal, Unfortunately a zero crosser does not do anything for inrush. It is good for the switch, but that's all. To limit inrush you have to add series resistance so current is limited over some time p; /archives//html/Amps/2006-09/msg00259.html (7,459 bytes)
311. Re: [Amps] amplifier design (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 21 Sep 2006 09:12:09 -0400; Amplifiers are pretty simple parts of communications systems, but I agree with other comments. You might just want to get your feet wet building a few proven designs instead of doing something from; /archives//html/Amps/2006-09/msg00260.html (7,745 bytes)
312. Re: [Amps] Price Help (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 21 Sep 2006 09:25:50 -0400; Dan, Tubes are worth whatever you can get for them. Myself, I'd be very reluctant to pay anything for an as-is power grid glass tube without knowing for sure it runs. The reason is the seals always; /archives//html/Amps/2006-09/msg00261.html (8,480 bytes)
313. Re: [Amps] Fw: Step Start on a 3KA Amp (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 21 Sep 2006 20:34:04 -0400; If your supply fully and smoothly charges in one quarter cycle and only draws 20 amps while doing it that is a miracle Jeff. You either have a supply with horrible ESR or you are missing something.; /archives//html/Amps/2006-09/msg00277.html (8,578 bytes)
314. Re: [Amps] Fw: Step Start on a 3KA Amp (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 22 Sep 2006 22:04:20 -0400; Hi Jeff, I get about six amps peak current in the diodes with a 1 amp load, and a start up current starting at zero of 23 amps into the cap. That 23 amps has to come from the power line, and is incre; /archives//html/Amps/2006-09/msg00288.html (10,141 bytes)
315. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 24 Sep 2006 18:22:27 -0400; Of course we all know, or at least we should know, that SWR is affected only by the ratio of load impedance to line impedance unless: 1.) The meter's zero SWR impedance is not the same as the impeda; /archives//html/Amps/2006-09/msg00295.html (8,354 bytes)
316. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 24 Sep 2006 21:12:59 -0400; Jim, I'd look closely at three things: 1.) The null setting of the Titan Bridge 2.) The way they wired things between the bridge and the antenna relay on the output. You can't really have more than; /archives//html/Amps/2006-09/msg00299.html (7,672 bytes)
317. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 25 Sep 2006 05:38:54 -0400; out jack. That is in a lot of amps, if the relay was after the meter If a relay contact was so dirty as to change SWR reading, it would be melting. There is no way to change SWR by a bad series conne; /archives//html/Amps/2006-09/msg00305.html (8,824 bytes)
318. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 25 Sep 2006 05:42:20 -0400; I doubt that. By ground loops I meant ground loops on the SWR detector board causing the reading to vary with frequency. External loops that affect the meters unequally with power would never occur.; /archives//html/Amps/2006-09/msg00306.html (8,594 bytes)
319. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 25 Sep 2006 17:02:32 -0400; ...and that suggestion was what? The Titan's I have worked on use a transistor bias switch. When it fails the power out and anode current is very low, almost like soft tubes. I use different transis; /archives//html/Amps/2006-09/msg00313.html (10,227 bytes)
320. Re: [Amps] *** SPAM *** Re: Titan 425 Reflected Power (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 26 Sep 2006 06:00:34 -0400; Hi Peter, This can easily be seen on paper. He had external meters that all agreed. He had an internal meter that NO meter wiring external to the cabinet that disagreed. That rules out all external; /archives//html/Amps/2006-09/msg00315.html (8,758 bytes)

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