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1. [AMPS] Re: 6m amp blocking caps (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 6 Dec 2001 22:39:36 -0500; I agree the dipper measures series resonance. You might explain how to find a real parallel resonance in two caps. Nothing comes to mind here...after 30 seconds, anyway. jeff, wa1hco -- FAQ on WWW: h; /archives//html/Amps/2001-12/msg00153.html (10,017 bytes)
2. [AMPS] gettering (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 14 Sep 2001 22:47:09 -0400; < lot's the usual stuff deleted > Actually, we can see that 1000C (1270K) is redhot and yellow/white occurs at about 5000C. Check out http://www.ameritech.net/users/lmammel/scale.html For another rea; /archives//html/Amps/2001-09/msg00258.html (7,705 bytes)
3. [AMPS] Additional Info Voltage Doubler/Filter Capacitance (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 20 Sep 2001 22:32:23 -0400; This is a multi-part message in MIME format. --=_NextPart_000_0017_01C14224.1E361040 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I sent kurt an image of; /archives//html/Amps/2001-09/msg00384.html (14,487 bytes)
4. [AMPS] Disconnected? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sat, 2 Jun 2001 11:32:16 -0400; I got disconnected somehow as well. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contes; /archives//html/Amps/2001-06/msg00012.html (7,132 bytes)
5. [AMPS] 2 x 8877 on 6 meters? (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 10 May 2001 20:33:21 -0400; Probably need to increase Q until Cout, plus strays, plus Ctune minimum value will resonant. If Ctune has too much min C to produce a reasonable Q, the trick is to insert an inductor between anode an; /archives//html/Amps/2001-05/msg00173.html (9,054 bytes)
6. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sat, 26 May 2001 10:35:22 -0400; Several posts have referred to reflected power from a mismatched filter. People have reasoned, "If the output is 3 dB down, then the power has to go somewhere". But, it's also reasonable to consider; /archives//html/Amps/2001-05/msg00446.html (9,563 bytes)
7. [AMPS] Input impedance (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 27 May 2001 19:24:26 -0400; Only the top of the pages download here. Anyone else have the same problem? jeff, wa1hco -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: am; /archives//html/Amps/2001-05/msg00466.html (8,576 bytes)
8. [AMPS] 4-1000A Project (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 5 Apr 2001 01:13:21 -0400; Here's another way to look a Q that I've never seen discussed before. (There's probably a reason for that but maybe is helps someone) You don't have to look at a pi-net as impedance transformation. T; /archives//html/Amps/2001-04/msg00093.html (13,105 bytes)
9. [AMPS] 4-1000A Project (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 5 Apr 2001 21:56:38 -0400; The current circulating in a pi-net tank coil divides between the load capacitor and the coax because they're effectively in parallel. My old ARRL handbook shows (for 3.5MHz) an 875 pf load C for a Q; /archives//html/Amps/2001-04/msg00121.html (17,384 bytes)
10. [AMPS] Zener screen supplies (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 13 Apr 2001 22:29:06 -0400; Sound right to me, Triodes almost never exhibit flashovers the screen. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contes; /archives//html/Amps/2001-04/msg00312.html (9,336 bytes)
11. [AMPS] 3 phase transforers and single phase (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Thu, 19 Apr 2001 21:02:40 -0400; I have an old metal lathe with a three phase motor. In order to get three phase power to drive the motor I got a 5 HP three phase motor from the junk yard. I connected 240 across two of the phases an; /archives//html/Amps/2001-04/msg00442.html (10,415 bytes)
12. [Fwd: [AMPS] 3 phase transforers and single phase] (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 20 Apr 2001 19:22:32 -0400; Note: you don't need a motor generator, just a motor... Start a 3 phase motor on two phases and it will generate the third phase, just by spinning. jeff, wa1hco -- FAQ on WWW: http://www.contesting.c; /archives//html/Amps/2001-04/msg00449.html (7,370 bytes)
13. [AMPS] 3 phase transforers and single phase (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sat, 21 Apr 2001 22:34:54 -0400; Jim... Using a motor as a rotary phase convert is standard, traditional, and works extremely well. See the web site below for more discussion. http://web.wt.net/~hmsc/phconv/phconv.htm None of the di; /archives//html/Amps/2001-04/msg00457.html (12,152 bytes)
14. [AMPS] basic question about dipping the plate (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 22 Apr 2001 00:18:43 -0400; The output network becomes parallel resonant at dip and parallel resonant circuits have their highest impedance at resonance. Off resonance, the tune cap and inductor look like shunts to ground and t; /archives//html/Amps/2001-04/msg00460.html (9,151 bytes)
15. [AMPS] basic question about dipping the plate (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 22 Apr 2001 13:09:41 -0400; I like my answer better. Because it answers a basic question in a basically correct way. Besides, where do you get the idea that an L network at resonance is a dead short? jeff, wa1hco tune work -- F; /archives//html/Amps/2001-04/msg00467.html (10,169 bytes)
16. [AMPS] basic question about dipping the plate (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 22 Apr 2001 14:52:58 -0400; This is a multi-part message in MIME format. --=_NextPart_000_000C_01C0CB3B.EBDFDE00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We need a drawing. Here; /archives//html/Amps/2001-04/msg00473.html (28,861 bytes)
17. [AMPS] Transformer ++ (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sat, 24 Mar 2001 21:57:27 -0500; How about a switch mode power supply that drops 120-0-120 full wave rectified down to 50 volts? This will require a switcher chip, some hefty FET's and a high frequency, high power choke but no trans; /archives//html/Amps/2001-03/msg00241.html (9,075 bytes)
18. [AMPS] Transformer ++ (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 25 Mar 2001 10:48:03 -0500; 5 KW switcher? no. But switching power supply to power digital logic in communication receivers, yes. It's not a trivial task, that's true, but it's not magic either, design works. The primary driver; /archives//html/Amps/2001-03/msg00250.html (11,230 bytes)
19. [AMPS] Transformer ++ (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 25 Mar 2001 12:13:14 -0500; You missed my point. My design receiver consisted of a switching power supply _and_ associated digital logic with wideband A/D running with high dynamic range an a -110 dBm received signal. This shie; /archives//html/Amps/2001-03/msg00254.html (16,043 bytes)
20. [AMPS] Transformer ++ (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Sun, 25 Mar 2001 13:35:40 -0500; Jeesh... Try to make some helpful suggestions and discuss something more advanced than transformers and we get a condescending attitude. Why, exactly, would a switcher have a slow startup time? The o; /archives//html/Amps/2001-03/msg00256.html (9,462 bytes)

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