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1. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 12:25:08 -0700; Compared to poor regulation, yes. Compared to a well-engineered zener shunt screen regulator, probably not a significant improvement. To arrive at good linearity with a 4cx250B/R/BC/7203, load for le; /archives//html/Amps/2002-07/msg00006.html (8,103 bytes)
2. [Amps] choke resonances (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 12:49:47 -0700; Choke design is not rocket science. One needs a dipmeter and some kind of a winder. I use a hand crank drill, Winding HV-RF chokes is described on my Web site. One reason for making gaps in the wind; /archives//html/Amps/2002-07/msg00011.html (7,572 bytes)
3. [Amps] choke resonances (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 12:49:52 -0700; Confirming that gaps do not work as advertised might be useful. I do not believe this because I have been there. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00012.html (7,371 bytes)
4. [Amps] choke resonances++ (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 12:59:31 -0700; They exist at series resonances. I have seen choke fires. The trick is to park 'em on WWV frequenciess or other out of the way spots at least 6% away from ham (or CB) frequencies. redistribution max; /archives//html/Amps/2002-07/msg00015.html (9,431 bytes)
5. [Amps] Defibrulator Caps as Filter Caps (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:22:02 -0700; The worst scenario is that the cap. shorts and the CB opens the primary. To test ripple current handling ability, apply 60Hz at whatever V it takes to produce the expected ripple current, run it for; /archives//html/Amps/2002-07/msg00020.html (8,204 bytes)
6. [Amps] Fair Pric? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:22:04 -0700; What would be a fair price for an amplifier similar to the 8170/8171 amplifier on my Web site? - Specs: 160m - 15m, (no CB), 20db gain SSB, drive power required, 170Wpep, 110kg complete. - R. L. Meas; /archives//html/Amps/2002-07/msg00021.html (6,231 bytes)
7. [Amps] TL922A Band Switch (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:22:05 -0700; Trio-Kenwood still sells the bandswitch for c. $80. There is an article on my Web site that addresses bandswitch arcing in the 922. See Figure 15. A 922 bandswitch should be able to withstand 5000vd; /archives//html/Amps/2002-07/msg00022.html (6,722 bytes)
8. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:33:49 -0700; ** Would you trust a stock buy recommend from a brokerage that gave salesmen a commission on stock sold? ** A two-tone imd test is about as useful for evaluating splatter as teats on a boar hog. - R; /archives//html/Amps/2002-07/msg00024.html (8,624 bytes)
9. [Amps] choke resonances (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:44:32 -0700; ** I have done it with two chokes mounted at right angles. 15MHz is a good parking spot. ** good point ** True but more L is needed for 160m operation using a tube with handles. - R. L. Measures, a.; /archives//html/Amps/2002-07/msg00027.html (8,216 bytes)
10. [Amps] Drake L7 PS questions update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:44:34 -0700; Yes, if you like to repair amps. The PS chapter of the newer Handbooks explains why equalizer resistors unequalize the reverse currents in a string of diodes and increase the chance of diode failure; /archives//html/Amps/2002-07/msg00028.html (8,129 bytes)
11. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 18:06:02 -0700; ** I built a 2 x 4cx250 2m AB1 amplifier with a conservatively run zener shunt screen regulator. It was as clean as Eimac claimed. // It means that foxes should probably not be entrusted with hen-ho; /archives//html/Amps/2002-07/msg00030.html (9,040 bytes)
12. [Amps] winding chokes (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 18:10:53 -0700; My Stanley hand-crank drill does the job and it has way fewer transistors and ICs. . - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00031.html (7,034 bytes)
13. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 19:25:07 -0700; 1. Because most designers assume that a 5w zener can work well at 5w. 2. A spectrum analyzer is not the right measurement tool. 3. Such a test should measure p-p screen V - with voice-mod - vs total; /archives//html/Amps/2002-07/msg00035.html (11,909 bytes)
14. [Amps] Drake L7 PS questions update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 19:25:12 -0700; I read it again, Jeff. Which capacitors are you talking about at "adding capacitance gives me some extra filtering cushion"? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measur; /archives//html/Amps/2002-07/msg00036.html (9,804 bytes)
15. [Amps] winding chokes (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 19:25:15 -0700; The hand drill has a c. a 4 to 1 stepup gear ratio and a 3/8" chuck capacity. Drilling anything harder than wood using a 3/8" bit is best left to Popeye or Bluto. cheers, Conrad - R. L. Measures, a.; /archives//html/Amps/2002-07/msg00037.html (7,593 bytes)
16. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 2 Jul 2002 05:52:38 -0700; good question, Frank cheerz - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00043.html (7,853 bytes)
17. [Amps] Drake L7 PS questions (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 2 Jul 2002 05:52:41 -0700; Given the working V in an L7 filter, an extra 450v filter cap would be guilding the lilly. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00044.html (7,264 bytes)
18. [Amps] RF choke selection (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 2 Jul 2002 17:25:57 -0700; Measuring resonances without making a connection to the RFC is good.. A dip-meter does this - although coupling two coils that can not be put parallel to each other is a hurdle. Use a dipmeter to lo; /archives//html/Amps/2002-07/msg00051.html (8,143 bytes)
19. [Amps] RF choke selection (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 2 Jul 2002 17:58:15 -0700; sounds good Do you sell an extinguisher that is safe for puttin' out choke fires? thanks, Phil - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00052.html (7,375 bytes)
20. [Amps] 4-250A question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 4 Jul 2002 06:38:36 -0700; The emissive life of a thoriated tungsten cathode/filament varies as [e1/e2]^23.4. Or, in other words, each 3% increase in fil. V over what is needed to produce normal emission, reduces emissive lif; /archives//html/Amps/2002-07/msg00058.html (7,750 bytes)

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