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1. [Amps] Sequencing an Alpha 87a (score: 1): Author: jsternmd <jsternmd@earthlink.net>; Date: Tue, 22 May 2007 17:18:11 -0400 (GMT-04:00); Hi All, Recently there have been reports of a number of PA failures in recent manufactures of the ICOM IC-7800. Reasons are unclear but one concern is poor sequencing when the IC-7800 may be keying a; /archives//html/Amps/2007-05/msg00177.html (7,335 bytes)
2. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 22 May 2007 19:44:24 -0400; Timing is always a concern between any amp and amplifier. However, I key my 7800 from its MOSFET switching transistor into an old Alpha 70V with a vacuum relay speed-up circuit, and an Alpha 77Dx. N; /archives//html/Amps/2007-05/msg00180.html (8,775 bytes)
3. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 22 May 2007 19:45:55 -0400; Okay, I'll correct myself...should read "between any rig and amplifier." Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2007-05/msg00181.html (6,855 bytes)
4. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Dick Green" <wc1m@msn.com>; Date: Wed, 23 May 2007 21:50:20 -0400; I had some off-reflector discussion with Larry and found that his concern isn't with the 87A T/R switching. After all, the 87A uses PIN diodes and should be able to switch fast enough to not require; /archives//html/Amps/2007-05/msg00185.html (10,528 bytes)
5. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 23 May 2007 22:05:48 -0400; Dick, I can speak only of my own experience with the 7800 and to date, I have not run into any PA issues. Over the past few days, there's been a related discussion on the Yahoo 7800 group. Over a ~; /archives//html/Amps/2007-05/msg00186.html (8,105 bytes)
6. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 24 May 2007 04:43:01 -0400; I remember very well how I measured a new production rig of another brand and it had terrible sequencing. Despite seeing it with my own eyes an engineer at the company kept telling me it was fine an; /archives//html/Amps/2007-05/msg00187.html (8,134 bytes)
7. Re: [Amps] Sequencing an Alpha 87a (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 24 May 2007 07:05:39 -0400; I believe QST's expanded product reviews cover the transmit delay time and transmit receive turnaround time, but an actual scope representation of the full sequence would be a welcome addition. I us; /archives//html/Amps/2007-05/msg00190.html (8,751 bytes)

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