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Total 26 documents matching your query.

1. [AMPS] PIN diodes (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 29 May 2001 10:25:44 -0700; I'm using vacuum relay QSK for my amplifiers, and I've been happy with it. I have had to replace one vacuum relay and one reed relay over the past few years (I think the reed relay damage was my own; /archives//html/Amps/2001-05/msg00496.html (6,913 bytes)
2. [AMPS] pin diodes (score: 1): Author: phil@vaxxine.com (Phil T. (VE3OZZ)); Date: Tue, 20 Apr 1999 23:04:10; MicroSemi HUM 2020 : max PIV = 2000 V -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@; /archives//html/Amps/1999-04/msg00365.html (10,485 bytes)
3. [AMPS] PIN diodes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 22 Mar 1999 12:36:43 -0000; Further to my comments on the Unitrode UM4900 series, ZS5JF reminds me: CD rom from 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative; /archives//html/Amps/1999-03/msg00544.html (6,774 bytes)
4. [AMPS] PIN diodes (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 12 Jan 1999 15:11:16 -0500; I owned a pair of QSK-1500's many years ago. They could not even handle a 2:1 VSWR on 80M at 1200W. Several contesters also bought that model and blew them up repeatedly at under 1500W. I believe the; /archives//html/Amps/1999-01/msg00162.html (8,746 bytes)
5. [AMPS] PIN diodes (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 8 Dec 1997 15:32:21 -0000; Additionaly, Unitrode Corp did a very good Apps book. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contes; /archives//html/Amps/1997-12/msg00134.html (6,595 bytes)
6. [Amps] Pin Diodes (score: 1): Author: Rob & Terri Sherwood <rob@sherweng.com>; Date: Tue, 07 Mar 2006 22:19:49 -0700; It is interesting that Alpha threw in the towel on PIN diodes with the upcoming 9500. Tech support told me the yield on a batch of diodes was terrible, possibly as low as 30%. That is a shame, as my; /archives//html/Amps/2006-03/msg00184.html (6,906 bytes)
7. Re: [Amps] Pin Diodes (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 8 Mar 2006 06:45:32 -0500; The vacuum relay in my Alpha 70V has lasted 36 years. A vacuum relay with an appropriate accelerator circuit can switch nearly as fast as a PIN diode. Paul, W9AC ____________________________________; /archives//html/Amps/2006-03/msg00187.html (7,027 bytes)
8. Re: [Amps] Pin Diodes (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 8 Mar 2006 08:00:28 -0500; http://www.somis.org/D-a-07B.jpg Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00189.html (7,667 bytes)
9. Re: [Amps] Pin Diodes (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 08 Mar 2006 07:04:36 -0600; Paul, I think your experience with relay lifetimes is pretty typical of amps used on a regular basis in normal operation and is shared by many of us. But I suspect that if an amp is operated in a CW; /archives//html/Amps/2006-03/msg00190.html (8,844 bytes)
10. Re: [Amps] Pin Diodes (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 08 Mar 2006 06:58:08 -0600; Hi, Rob-- I, too, was disappointed to hear that the 9500 was going back to a vacuumrelay-based QSK system since I have been very happy with my Alpha 87As and have never had any problems with PIN diod; /archives//html/Amps/2006-03/msg00191.html (12,627 bytes)
11. Re: [Amps] Pin Diodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Wed, 8 Mar 2006 05:15:59 -0800; Quite true, but 2mS R/T, T/R switching is not exactly lethargic. Does Alpha use a speedup circuit with their vacuum relays? Rich Measures, 805.386.3734, AG6K, www.somis.org __________________________; /archives//html/Amps/2006-03/msg00193.html (8,646 bytes)
12. Re: [Amps] Pin Diodes (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 8 Mar 2006 08:38:49 -0500; John, I agree with your statement. I don't mean that all other factors being equal, a vacuum relay can approach the microsecond switching speeds of the PIN diode. But as a practical matter as used i; /archives//html/Amps/2006-03/msg00194.html (9,411 bytes)
13. Re: [Amps] Pin Diodes (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Mar 2006 09:15:05 -0600; Something that appears to have been missed in this discussion of T/R switching, especially where QSK is involved, is that both transceivers and amps have delay circuits involved that prevent the rig; /archives//html/Amps/2006-03/msg00198.html (8,503 bytes)
14. Re: [Amps] Pin Diodes (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 08 Mar 2006 09:34:02 -0600; Hi, Paul-- I love how my 781s and 87As play together. On CW we can hear the back-scatter echoes and turn the antennas as appropriate. And even on SSB with PTT you can hear a slightly different "kerch; /archives//html/Amps/2006-03/msg00200.html (11,828 bytes)
15. Re: [Amps] Pin Diodes (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 8 Mar 2006 16:22:21 +0000; For a very effective single-band solution using low-cost diodes, see: http://www.sm5bsz.com/pindiode.htm This switch will handle 2.5kW and is fast enough to hear the station's radar echoes: http://ww; /archives//html/Amps/2006-03/msg00202.html (10,145 bytes)
16. Re: [Amps] Pin Diodes (score: 1): Author: "Joe Subich, W4TV" <W4TV@subich.com>; Date: Wed, 8 Mar 2006 11:55:02 -0500; Or one can simply use additional diodes in the receive path that are biased off during transmit and on during receive. The key is to use two or three stages and sufficient negative bias to keep them; /archives//html/Amps/2006-03/msg00205.html (8,849 bytes)
17. Re: [Amps] Pin Diodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Wed, 8 Mar 2006 08:57:40 -0800; The Jennings catalog is another source of speedup circuits. The basic theory behind the technique is to quickly overcome the 0.7H of L in the RJ-1A or HC-1 by applying additional V at turn on in orde; /archives//html/Amps/2006-03/msg00206.html (9,173 bytes)
18. Re: [Amps] Pin Diodes (score: 1): Author: "Joe Subich, W4TV" <W4TV@subich.com>; Date: Wed, 8 Mar 2006 12:05:55 -0500; John, I would be interested in the carrier lifetime measurements on the IN4007 when you get them (or if anyone else has similar numbers). The biggest problem John Sheller had with the QSK1500 in the; /archives//html/Amps/2006-03/msg00208.html (15,080 bytes)
19. Re: [Amps] Pin Diodes (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 8 Mar 2006 17:11:20 +0000; Somebody wrote (sorry, the direct message didn't arrive here): There is also a circuit originated by K1KP, and publicized by K6XX, which does not need a high voltage rail. It works directly from the; /archives//html/Amps/2006-03/msg00209.html (9,321 bytes)
20. Re: [Amps] Pin Diodes (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 08 Mar 2006 09:14:49 -0800; I just want to add my own anecdotal evidence and prejudices here. I had an Alpha 86 (apparently updated) for a couple of years with absolutely no PIN diode problems, and I operate QSK cw exclusively,; /archives//html/Amps/2006-03/msg00210.html (8,966 bytes)

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