- 1. [AMPS] Q and parasitics. (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Mon, 18 Jun 2001 08:50:13 +0100
- Looking at the 1946 ARRL handbook last night (when I got it at Dayton this year, someone asked if I was modernising the station!) A number of their tx's have parasitic suppressors consisting of air w
- /archives//html/Amps/2001-06/msg00135.html (8,741 bytes)
- 2. [AMPS] Q and parasitics. (score: 1)
- Author: 2@vc.net (2)
- Date: Mon, 18 Jun 2001 08:08:25 -0700
- 1/2 sufficient and miss /\ so it seems, Peter /\ good point. 813s won't osc. with no parasitic suppressor whatsoever. /\ Before I wrote the October, 1988 *QST* article on parasitics, I brainstormed
- /archives//html/Amps/2001-06/msg00137.html (9,350 bytes)
- 3. [AMPS] Q and parasitics. (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Mon, 18 Jun 2001 16:20:45 +0100
- Dunno about that (I've never tried, but I've never had parasitics in an 813 stage, even without stoppers), but most of these designs were for triodes. The odd pentode - HK257 and the like - but mainl
- /archives//html/Amps/2001-06/msg00138.html (8,703 bytes)
- 4. [AMPS] Q and parasitics. (score: 1)
- Author: philk5pc@tyler.net (Phil Clements)
- Date: Mon, 18 Jun 2001 10:36:45 -0500
- Hi Peter, and fellow "Ampers." There was a construction article in the January 1974 issue of Ham Radio Magazine by John R. True, W4OQ entitled "Five-Band Kilowatt Amplifier" which used a single 4-100
- /archives//html/Amps/2001-06/msg00139.html (7,886 bytes)
- 5. [AMPS] Q and parasitics. (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Mon, 18 Jun 2001 16:45:16 +0100
- I think that's the key comment. The 1946 handbook circuits had no resistive loading at all. All the circuits looked slightly dodgy - no screening, quite long leads on neutralising caps, nice open con
- /archives//html/Amps/2001-06/msg00141.html (7,747 bytes)
- 6. [AMPS] Q and parasitics. (score: 1)
- Author: kc4slk@csrlink.net (Mike Sawyer)
- Date: Mon, 18 Jun 2001 17:01:52 -0400
- Dunno about that (I've never tried, but I've never had parasitics in an 813 stage, even without stoppers), but most of these designs were for triodes. The odd pentode - HK257 and the like - but mainl
- /archives//html/Amps/2001-06/msg00146.html (10,093 bytes)
- 7. [AMPS] Q and parasitics. (score: 1)
- Author: 2@vc.net (2)
- Date: Mon, 18 Jun 2001 18:21:18 -0700
- /\ We supply a ferrite VHF attenuator bead in our suppressor retrofit kit for the Henry 2K-4 and 3K-A. The bead helps to isolate the HV-RFC's self resonance near 95MHz from the parasitic osc. at 95M
- /archives//html/Amps/2001-06/msg00148.html (9,246 bytes)
- 8. [AMPS] Q and parasitics. (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Tue, 19 Jun 2001 07:16:15 +0100
- than the You've got me interested with that! How come? What was the mechanism? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative request
- /archives//html/Amps/2001-06/msg00149.html (7,504 bytes)
- 9. [AMPS] Q and parasitics. (score: 1)
- Author: g8gsq@qsl.net (Steve Thompson)
- Date: Tue, 19 Jun 2001 07:49:30 +0100
- 6146s, gate satisfactory. I suspect one of the problems with ferrite beads is the unknown and/or not understood characteristics of so many in circulation, especially when one from the junkbox is used
- /archives//html/Amps/2001-06/msg00150.html (7,687 bytes)
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