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1. [Amps] High voltage MOSFETs (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Wed, 3 May 2017 19:23:31 +0000; For those interested, MIcrosemi has a line of relatively high voltage RF MOSFETs: https://www.microsemi.com/existing-parts/parts/81771 One intriguing possibility with these is direct coupling (throug; /archives//html/Amps/2017-05/msg00044.html (7,237 bytes)
2. Re: [Amps] High voltage MOSFETs (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 3 May 2017 15:52:05 -0400; Only on 160 meters for 750 Watts output. By the time one gets to 27 MHz the optimum output impedance is down around 5 Ohms ... it would be a real trick to design a broadband output. The best approach; /archives//html/Amps/2017-05/msg00045.html (7,755 bytes)
3. Re: [Amps] High voltage MOSFETs (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Wed, 3 May 2017 23:09:35 +0100; I think most of these are products inherited when they took over APT. There's a number of app notes to go with them - they were originally designed for narrow band saturated cw use and one common the; /archives//html/Amps/2017-05/msg00046.html (7,798 bytes)
4. Re: [Amps] High voltage MOSFETs (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Thu, 4 May 2017 08:26:24 +0200; Tokyo High Power used a pair of ARF1500 in their HL2.5KFX. http://www.ab4oj.com/dl/thp/hl2_5kfx/manual_hl2_5kfx_complete_schematics.pdf Two amps with those transistors were built in Germany: https://; /archives//html/Amps/2017-05/msg00047.html (8,356 bytes)
5. [Amps] High voltage MOSFETs (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 4 May 2017 06:18:38 -0700; or non linear, low duty cycle, pulsed modes. Drop the po in half, imd improves, but eff drops to 35%. po way up, and improved cooling techniques for high duty cycle modes. Then leave the real job of; /archives//html/Amps/2017-05/msg00052.html (8,174 bytes)
6. Re: [Amps] High voltage MOSFETs (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 04 May 2017 23:29:59 +0000; Bill, One intriguing possibility with these is direct coupling (through an LP filter and DC isolation of course) to 50 ohm coax. Forget the low Q lowpass filter. This transistor is rated for 300pF ou; /archives//html/Amps/2017-05/msg00059.html (15,104 bytes)
7. [Amps] High voltage MOSFETs (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 5 May 2017 10:11:00 -0700; of these proposed configurations ?? I just cant fathom manually tuning up a SS amp..... unless you were really careful, and pulse tuned it with a low 3-10 % duty cycle, and also starting with low dri; /archives//html/Amps/2017-05/msg00068.html (9,117 bytes)
8. Re: [Amps] High voltage MOSFETs (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 05 May 2017 22:17:37 +0000; Jim, of these proposed configurations ?? I have often tuned up solid state amps. While I have never so far seen one that has tune and load controls on the front panel, or anything like that, many sol; /archives//html/Amps/2017-05/msg00077.html (14,181 bytes)

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