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81. [Amps] MOSFET amp article (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 11 Jan 2005 14:32:08 +0000; Thanks to Conrad G0RUZ, George K8BRW, Peter OZ1PIF and Joe K4IK for various reduced size versions of the articles. I'll upload one or more options later today. No more versions needed now, thanks! 73; /archives//html/Amps/2005-01/msg00200.html (6,655 bytes)
82. Re: [Amps] MOSFET amp article (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 11 Jan 2005 15:15:05 +0000; Two smaller versions now uploaded to www.eltac.co.uk/amp_article/amp.htm - both pdfs. From the original QST CDROMs, about 550kb, and also a conversion of my .bmp files, about 5.5Mb (this has slightly; /archives//html/Amps/2005-01/msg00201.html (7,229 bytes)
83. Re: [Amps] MOSFET amp article (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 12 Jan 2005 09:12:37 -0000; You'll almost certainly kill any transistor that bias point connects to. As an aside, I've alwys thought the 723 bias circuit used in the Motorola apps to be needlessly complex, and an invitation for; /archives//html/Amps/2005-01/msg00228.html (8,574 bytes)
84. Re: [Amps] OT: Anyone know of any RF Speech Processor Kits? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 15 Jan 2005 16:59:39 -0000; Don't know of any kits, but (very) many years ago I built a processor from a design (I think) in Ham Radio. Rather than RF, it split the audio into four bands, clipped each one then filtered out the; /archives//html/Amps/2005-01/msg00276.html (9,226 bytes)
85. Re: [Amps] Dentron MLA-2500 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 16 Jan 2005 08:31:49 -0000; I experimented half heartedly with the same idea but it didn't progress. While I didn't succeed, someone with more resolve will probably do better. A decent 2m tank circuit needs much better screenin; /archives//html/Amps/2005-01/msg00289.html (8,475 bytes)
86. Re: [Amps] OT: RF Speech Processor Kits - Final Final (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 16 Jan 2005 09:41:04 -0000; Just for the record, can I mention that the split band audio clipper I referred to isn't a simple compressor/clipper that generates lots of harmonic distortion and splatter. By splitting the audio in; /archives//html/Amps/2005-01/msg00293.html (7,812 bytes)
87. Re: [Amps] Dentron MLA-2500 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 16 Jan 2005 15:57:15 -0000; I think this 4CX800/GU74B design would fit, and the PSU voltage suits the tube: http://216.87.144.102/svetlana/TechBulletins/technoteNo42.asp Whatever happened to www.svetlana.com? I've had very good; /archives//html/Amps/2005-01/msg00299.html (8,886 bytes)
88. Re: [Amps] OT: RF Speech Processor Kits - Final Final (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 16 Jan 2005 22:06:25 -0000; I'm sorry, but I don't understand what you're getting at here. An infinite spike of what? Am I wrong in thinking that, in a SSB tx, an infinite spike in amplitude out needs an infinite spike of ampli; /archives//html/Amps/2005-01/msg00311.html (11,165 bytes)
89. Re: [Amps] OT: RF Speech Processor Kits - Final Final (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 17 Jan 2005 10:29:16 +0000; There's always something for me to learn from Pappenfus, Breune & Schoenike. The infinite spike requires infinite bandwidth - in practice the highest harmonic is likely to be 9th (2700 from 300 x 9); /archives//html/Amps/2005-01/msg00317.html (9,485 bytes)
90. Re: [Amps] OT: RF Speech Processor Kits - Final Final (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Mon, 17 Jan 2005 19:05:15 -0000; I found my copy of the Ham Radio article, which uses four bands. The heart of it is just two quad opamps. I'd imagined that the pro units used more bands, but DSP can be clever stuff.... 'Look ahead'; /archives//html/Amps/2005-01/msg00322.html (10,342 bytes)
91. Re: [Amps] OT: RF Speech Processor Kits - Final Final (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Mon, 17 Jan 2005 22:17:58 -0000; The SL1626 is 'alc' before the clipper - you can leave it out and adjust the input setting manually. Depending on the mic you might need to add a straight gain stage. The auto gain adjust is useful i; /archives//html/Amps/2005-01/msg00327.html (8,880 bytes)
92. Re: [Amps] Tornado 100 need info (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 18 Jan 2005 16:46:21 +0000; I can't help with the circuit details, but MRF455 is rated for 60W output, so 250W pep (output) is not realistic. My guess is that the 2-30MHz is also a lie - the amp was probably designed for 27MHz; /archives//html/Amps/2005-01/msg00349.html (6,989 bytes)
93. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Tue, 18 Jan 2005 19:40:25 -0000; I can understand how dc on a directly heated tube might introduce some effects, but I can't see that it makes any difference on the heater of an indirectly heated cathode (maybe hum issues in an audi; /archives//html/Amps/2005-01/msg00355.html (8,218 bytes)
94. [Amps] Data sheets (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 22 Jan 2005 16:59:05 +0000; I'm sure I have 4CX1500A full data somewhere. I'll hunt for it next week. I suspect I'm the only person in the world with some of the tubes. Steve _______________________________________________ Amps; /archives//html/Amps/2005-01/msg00452.html (7,188 bytes)
95. Re: [Amps] What is it called? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 23 Jan 2005 08:37:43 -0000; There are many different flavours of Tufnol with different fillers and reinforcing. At least some of them (if not all) are hygroscopic, so beware. Steve ______________________________________________; /archives//html/Amps/2005-01/msg00476.html (9,158 bytes)
96. Re: [Amps] 8171 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 27 Jan 2005 09:05:51 -0000; If it's a problem, I'd echo the suggestions G8TIC made in a reply to your previous posting - consider something other than a pi-tank. You might find some useful stuff in this description of a working; /archives//html/Amps/2005-01/msg00532.html (7,064 bytes)
97. Re: [Amps] Plate choke magic? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 29 Jan 2005 08:07:50 -0000; It might, although I think you're looking for low loss not high loss in the core material. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2005-01/msg00555.html (7,988 bytes)
98. Re: [Amps] please help with weird problem (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 29 Jan 2005 08:41:33 -0000; output stage of the rig, maybe some combination of rig and amplifier. If it was due to rf feedback, the feedback got in after the point where ALC is applied in the rig. Any amplifier (in this case th; /archives//html/Amps/2005-01/msg00557.html (8,732 bytes)
99. Re: [Amps] Choices for valve linear project 1st timer! (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Mon, 31 Jan 2005 22:32:46 -0000; I've always admired that one too - although the live chassis version is not for the faint hearted! Leave the ht low on '250s, run them at 150-200W out and the problems and vices go away. It's not as; /archives//html/Amps/2005-01/msg00655.html (9,625 bytes)
100. Re: [Amps] Datong ASP (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 02 Feb 2005 11:47:57 +0000; I have circuits and alignment details for the original 'diecast box' version if they're of any help. Steve _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2005-02/msg00021.html (6,585 bytes)

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