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References: [ +from:Peter_Chadwick@mitel.com: 967 ]

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1. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 12:32:54 +0100; We usually think of g-g as being AB2 with triodes or triode connected tetrodes/pentodes. Does it have to be? I've never seen an AB1 grounded grid design, but is there any reason why one couldn't driv; /archives//html/Amps/2001-06/msg00047.html (9,058 bytes)
2. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 13:36:06 +0100; /\ no. the Collins 30S-1 is AB1 cathode driven. I'd forgotten that one. Not sure you can really call it grounded grid, though, since the grid is grounded through 220pF so that feedback can be applied; /archives//html/Amps/2001-06/msg00050.html (8,768 bytes)
3. [AMPS] 4cx250* amp building plans (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 6 Jun 2001 13:51:56 +0100; I bought copies of the 1946 and 1953 ARRL Handbooks at Dayton for my collection. G3XTT asked if I was looking to update the station equipment......actually, just the oeprator. 73 Peter G3RZP -- FAQ o; /archives//html/Amps/2001-06/msg00052.html (8,584 bytes)
4. [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)
5. [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)
6. [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)
7. [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)
8. [AMPS] Review of Antenna Tuner from Dayton (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 20 Jun 2001 08:31:47 +0100; Leaving aside the comments on bread (you haven't tried UK sliced white bread for yukkiness!), my experience is that if you design the tuner for the antenna, there are few situations where problems oc; /archives//html/Amps/2001-06/msg00178.html (10,162 bytes)
9. [AMPS] Filament voltage/bad advice (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 21 Jun 2001 07:35:34 +0100; Is this strictly true IF (and it's a big IF) the emission demands are such that the emission is still space charge limited? I'm thinking here of some equipment I've seen where admittedly receiving tu; /archives//html/Amps/2001-06/msg00218.html (8,176 bytes)
10. [AMPS] Review of Antenna Tuner from Dayton (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 21 Jun 2001 07:40:48 +0100; Come off it, Rich, it's not semi obvious. It's standing-there-shouting-glaring-one-in-the-face obvious! Even with ferrite baluns, it works - and extremely well, too. The technique has been around a l; /archives//html/Amps/2001-06/msg00219.html (9,051 bytes)
11. [AMPS] Review of antenna tuner from Dayton (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 21 Jun 2001 07:55:12 +0100; Here we definitely agree. Starting from the R + jX you need to match, a dedicated tuner can be designed to have the lowest operating Q for a particular impedance transformation ratio. Just how well b; /archives//html/Amps/2001-06/msg00221.html (9,319 bytes)
12. [AMPS] balanced ant tuners (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 22 Jun 2001 08:12:48 +0100; Ron asked The classic way is the one that's been in the ARRL handbook for at least 50 years. A parallel or series (depending) tuned circuit, link coupled to the coax line. Historically, you used a sw; /archives//html/Amps/2001-06/msg00246.html (8,772 bytes)
13. FW: [AMPS] balanced ant tuners (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Jun 2001 06:55:59 +0100; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2001-06/msg00272.html (9,191 bytes)
14. [AMPS] re: Board Decorum (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Jun 2001 07:11:02 +0100; Only if you have a somewhat perverse sense of humour! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contestin; /archives//html/Amps/2001-06/msg00273.html (7,507 bytes)
15. [AMPS] SB 220 on 6 meter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 May 2001 15:20:59 +0100; Leaving aside the fact that I know the expression as 'teats on a bull', doesn't this comment appear to apply to nearly all, if not all, ALC systems? The ones in amplifiers mostly seem to work on the; /archives//html/Amps/2001-05/msg00024.html (7,779 bytes)
16. [AMPS] ALC (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 May 2001 16:53:22 +0100; I suppose one way to improve matters would be to make the ALC closer to AGC, with a fairly high gain, and a voltage delay. The older rigs with 6146s which derived ALC from the onset of grid current w; /archives//html/Amps/2001-05/msg00026.html (7,462 bytes)
17. [AMPS] SB 220 on 6 meter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 May 2001 17:56:46 +0100; This is what I meant by the 'phase response' - I suspect that usually they've got the group delay problems, so have tpo slow down the ALC to try and keep it stable. Aye, there's the rub!! You only ha; /archives//html/Amps/2001-05/msg00028.html (7,865 bytes)
18. [AMPS] ALC (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 3 May 2001 07:45:14 +0100; There's general agreement amongst the group that all ALC circuits currently around in production equipments are non-ideal. It seems we all have our own approaches to deal with our own requirements. P; /archives//html/Amps/2001-05/msg00041.html (7,520 bytes)
19. [AMPS] YC-156 Cathode/Filament question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 8 May 2001 08:24:05 +0100; Unless you live in California! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-a; /archives//html/Amps/2001-05/msg00112.html (7,732 bytes)
20. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 10 May 2001 15:19:24 +0100; Read Dilbert - where you can see the reflection of management doing that all the time! It's done even more by politicians - of whatever party/nationality/race/creed etc. 73 Peter G3RZP -- FAQ on WWW:; /archives//html/Amps/2001-05/msg00175.html (9,437 bytes)

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