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1. Re: [Amps] PEP Reading Wattmeter (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Fri, 2 Oct 2009 09:21:11 -0700 (PDT); Hi Dick, Here's a circuit I designed to sense PEP with Bird 43. It may be adaptable to other units. http://wc6w.50webs.com/wc6waccy/index.html?fr40.html 73 & Good morning, Marv WC6W http://wc6w.50web; /archives//html/Amps/2009-10/msg00023.html (9,215 bytes)
2. Re: [Amps] Sunspots gone? (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 24 Sep 2009 09:15:53 -0700 (PDT); The sad story may be seen here: http://www.solarcycle24.com/ 73 & Good morning, Marv WC6W http://wc6w.50webs.com/ * _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2009-09/msg00279.html (7,188 bytes)
3. Re: [Amps] Carbon film or metal oxide film resistors for low-power RF circuits? (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 13 Aug 2009 08:31:48 -0700 (PDT); Hi Jim, I'd suggest using mil type RLR or if you realllly want long term reliabilty use type RNC. Either one will last near forever. No comparison to carbon comp or even film. 73 & Good morning, Marv; /archives//html/Amps/2009-08/msg00311.html (10,177 bytes)
4. Re: [Amps] SGC-Mini Lini (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 12 Aug 2009 09:50:43 -0700 (PDT); Hi Manfred, <snip> I have a PDF somewhere that addresses this problem. I'll dig it out and send it to you I once looked at doing it that way too -- gets a mite ugly. I'm currently building a test bed; /archives//html/Amps/2009-08/msg00288.html (11,410 bytes)
5. Re: [Amps] SGC-Mini Lini (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 10 Aug 2009 14:06:19 -0700 (PDT); Hi Bill, Yes, the delay between the Carrier and the Modulation has to be equalized somewhere... The original Kahn scheme implemented it at a fixed frequency with an LC delay. In the 21st century, one; /archives//html/Amps/2009-08/msg00253.html (12,563 bytes)
6. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 23 Jul 2009 08:41:57 -0700 (PDT); Hi Bill, The device I've proposed is located in the plate supply line between the PS filter caps and the tube. It is NOT on the primary side of the supply. 73 & Good morning, Marv WC6W http://wc6w.50; /archives//html/Amps/2009-07/msg00304.html (9,431 bytes)
7. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 23 Jul 2009 08:24:24 -0700 (PDT); Hi Bill, Same application; 21st Century solution. Damage is avoided by shutting off the power, veryyyy quickly, rather than by shunting it. My post was in reply to the one that suggested using a crow; /archives//html/Amps/2009-07/msg00302.html (9,820 bytes)
8. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 22 Jul 2009 17:30:28 -0700 (PDT); Hi Bill, Since it turns off in one uS, the filter cap(s) stay charged. The total let through power is on the order of one Joule. 73 & Good afternoon, Marv WC6W http://wc6w.50webs.com/ _______________; /archives//html/Amps/2009-07/msg00292.html (9,185 bytes)
9. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 22 Jul 2009 14:17:34 -0700 (PDT); IGBT's have evolved to the point where one can build an Electronic Circuit Breaker that will disconnect the load in a microsecond or so. This approach avoids dumping all the energy from the filter ca; /archives//html/Amps/2009-07/msg00280.html (7,399 bytes)
10. Re: [Amps] Relay Reglulator / Driver (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Tue, 21 Jul 2009 19:02:53 -0700 (PDT); Hi Mike, First a couple of suppositions. 1. I presume that the "cut off voltage" is negative. & 2. It has enough extra current capability for the relays. You can use a LM337 with a preregulator. Take; /archives//html/Amps/2009-07/msg00257.html (8,928 bytes)
11. [Amps] FS: Parts that may be of some use in Amplifiers (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Sun, 19 Jul 2009 14:02:45 -0700 (PDT); 1N2804A 6.8V 50 Watt Zener Diodes, TO-3 NOS -- $10 each Stancor Transformer P-6461 117 VAC Primary / 10VCT @ 10 A Secondary, used -- $25 Triad Transformers -- 115V 60CPS Primary F21A 6.3VCT @ 10A Sec; /archives//html/Amps/2009-07/msg00217.html (8,998 bytes)
12. Re: [Amps] monitoring tube seal temps (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 6 Jul 2009 09:07:27 -0700 (PDT); Hi Alex, Those parts won't suffice in this application. They work by summing the signal across multiple (2 or more) areas of the chip and don't produce an absolute output; Essentially an AC device. 7; /archives//html/Amps/2009-07/msg00124.html (8,557 bytes)
13. Re: [Amps] monitoring tube seal temps (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Sun, 5 Jul 2009 14:45:17 -0700 (PDT); Hi Larry, There are a couple manufacturers (names escape from my moldy old mind this afternoon) making complete sensors, with lenses and signal processing, in a transistor sized case covering up to 3; /archives//html/Amps/2009-07/msg00119.html (8,849 bytes)
14. Re: [Amps] 4-1000A in LK2000 (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Sat, 4 Jul 2009 09:45:12 -0700 (PDT); Hi Dick, The LK2000 was designed to be compatible with the 4-1000A; All the grids are grounded. A 4-1000A, in strapped GG, doesn't have quite the gain of a 3-1000Z. An experimental fellow might add a; /archives//html/Amps/2009-07/msg00092.html (10,861 bytes)
15. Re: [Amps] 4-1000A in LK2000 (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Fri, 3 Jul 2009 20:26:01 -0700 (PDT); Hi Kevin, The input impedance of a 4-1000A in "strapped" grounded grid is circa 110 ohms. A 3-1000Z runs around 65 ohms. Some input network tweaking will be necessary with a transistorized driver. 73; /archives//html/Amps/2009-07/msg00085.html (7,812 bytes)
16. Re: [Amps] Amp ideas needed (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 2 Jul 2009 09:22:17 -0700 (PDT); Hi Bill, 25 dB is a lot to expect from a single stage but... Perhaps, you should consider the 4CX350FJ. It only takes 20V peak RF drive. A swamped grid input, with a suitable parallel L to cancel the; /archives//html/Amps/2009-07/msg00042.html (8,361 bytes)
17. Re: [Amps] Question: Ship Vacuum Variables at minimum or maximum? (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 10 Jun 2009 12:23:23 -0700 (PDT); Hi Bob, Per the Jennings catalog, vacuum variables should be shipped at min. C. 73 & Good afternoon, Marv WC6W http://wc6w.50webs.com/ _______________________________________________ Amps mailing lis; /archives//html/Amps/2009-06/msg00047.html (8,709 bytes)
18. [Amps] Slightly OT: 250 degree panel meters (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 8 Jun 2009 09:14:22 -0700 (PDT); Just curious... Anyone happen to know how a 250 degree (deflection, not temperature!) panel meter is implemented? Goooglizing it doesn't seem to turn up any inside info... 73 & Good morning, Marv WC6; /archives//html/Amps/2009-06/msg00026.html (6,543 bytes)
19. [Amps] FS: Parts that may be of some use in Amplifiers (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 1 Jun 2009 08:55:32 -0700 (PDT); 1N2804A 6.8V 50 Watt Zener Diodes, TO-3 NOS -- $10 each Stancor Transformer P-6461 117 VAC Primary / 10VCT @ 10 A Secondary, used -- $25 Triad Transformers -- 115V 60CPS Primary F21A 6.3VCT @ 10A Sec; /archives//html/Amps/2009-06/msg00000.html (9,639 bytes)
20. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 28 May 2009 10:29:03 -0700 (PDT); Hi Dick, <snip> <snip> A good "rule of thumb" is 4X the tune capacitance. The value is not at all critical. 100pF, or thereabouts, will be fine for 6 meters with your pair of 3-500's. There are some; /archives//html/Amps/2009-05/msg00245.html (8,320 bytes)

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