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1. [Amps] HV MOSFETs for RF (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 5 May 2017 10:46:53 -0600; Its been really interesting reading comments on this subject. Up to now, most of the innovation posted on line has been using nonlinear classes like E for homebrew AM transmitters (another topic!) an; /archives//html/Amps/2017-05/msg00066.html (7,585 bytes)
2. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Fri, 5 May 2017 17:51:16 +0000 (UTC); This is one reason hams are always challenged in the amplifier area. The commercial users are heavily focused on FM, with its 100% duty cycle but lack of any requirement for linearity. The modes hams; /archives//html/Amps/2017-05/msg00070.html (8,659 bytes)
3. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 5 May 2017 13:56:33 -0400; excellent linearity?" The cellular and broadband/CATV industries to name two. Paul, W9AC -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _____; /archives//html/Amps/2017-05/msg00071.html (7,074 bytes)
4. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Fri, 5 May 2017 18:06:37 +0000 (UTC); What components do they typically use for their final output, high-power devices? Could hams use the same approach? How do they get around the efficiency and cooling problems we've been discussing? 7; /archives//html/Amps/2017-05/msg00072.html (8,204 bytes)
5. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "Jeff DePolo" <jd0@broadsci.com>; Date: Fri, 5 May 2017 14:17:54 -0400; Most definitely - just about any multi-carrier system. But let's separate "modulation modes" from the requirement that an *amplifier* be ideally linear. In the non-amateur world (including broadcast; /archives//html/Amps/2017-05/msg00073.html (9,022 bytes)
6. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Fri, 5 May 2017 11:22:22 -0700; Cellphone audio is just plain terrible, and with digital compression, cable tv has lost a lot of their picture quality. I used to get an OTA network Football telecast and switch over to the cable bro; /archives//html/Amps/2017-05/msg00074.html (8,925 bytes)
7. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "Mike & Becca Krzystyniak" <k9mk@flash.net>; Date: Fri, 5 May 2017 13:28:16 -0500; Hi Cathy, NXP/Freescale, and several others have devices in the cellular bands. Yes, this includes high power devices but I never had the pleasure of using something in the 1.5KW class, mostly restri; /archives//html/Amps/2017-05/msg00075.html (9,125 bytes)
8. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 05 May 2017 23:26:20 +0000; Cathy, To your list of other services needing linear amps you can add analog TV transmitters (where still used), digital TV transmitters, certain medical equipment, marine and aeronautical HF communi; /archives//html/Amps/2017-05/msg00079.html (11,168 bytes)
9. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Shane Youhouse <kd6vxi@gmail.com>; Date: Fri, 5 May 2017 17:28:22 -0700; It has been done. - 50 dB or better, from 4 milliwatts. "It starts with a low level FT-1000D (4 mW) output > into a (1 watt) ZHL-3A lab amplifier > into a homebrew 4CX-350FJ (5 watts) Mr. Clean > int; /archives//html/Amps/2017-05/msg00080.html (12,733 bytes)
10. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Sat, 6 May 2017 17:37:14 +0200 (CEST); I find the work of K1JJ quite interesting. Adjacent channel suppression in the order of 75 dB for voice signals is very good, and represents probably the best what reasonably may be realised In this; /archives//html/Amps/2017-05/msg00084.html (15,814 bytes)
11. [Amps] HV MOSFETs for RF (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Mon, 8 May 2017 01:44:12 -0600; Hi Cathy, For particle accelerator RF systems, we require linearity for some systems where the envelope of the RF pulse has ramped voltages. This is needed to capture particles such as ions and proto; /archives//html/Amps/2017-05/msg00092.html (9,030 bytes)
12. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Mon, 8 May 2017 10:00:51 +0200 (CEST); Just my 0.02: A lot of commercial and military users and systems also have stringent linearity requirements. One is the output stages of modern mobile telephony base stations and repeaters for indoor; /archives//html/Amps/2017-05/msg00093.html (10,379 bytes)
13. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 8 May 2017 07:14:48 -0400; Does anyone outside of ham radio care about modulation modes that require excellent linearity? 73, Cathy N5WVR AM and TV broadcasting, (analog and digital) except for the studio to transmitter link a; /archives//html/Amps/2017-05/msg00094.html (9,096 bytes)
14. [Amps] HV MOSFETs for RF (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 8 May 2017 09:50:36 -0700; <One is the output stages of modern mobile telephony base stations and repeaters for indoor coverage. <Several of the European type acceptance criteria actually require a -70 dB IM3 suppression in a; /archives//html/Amps/2017-05/msg00095.html (9,376 bytes)
15. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Mon, 8 May 2017 17:19:54 +0000 (UTC); It's been very interesting to see that many users have strict linearity requirements. I'm quite surprised that given all that industry experience, we still see ham rigs and amps with poor IMD and tho; /archives//html/Amps/2017-05/msg00096.html (10,053 bytes)
16. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Mon, 8 May 2017 19:48:07 +0200; Its not that simple. My class A amp does 25W and consumes 280W continuously. Who would buy a K3 then? 73 Peter achieve low IMD products. Perhaps Elecraft should think of doing just that with their K3; /archives//html/Amps/2017-05/msg00097.html (8,249 bytes)
17. Re: [Amps] HV MOSFETs for RF (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Tue, 9 May 2017 07:59:45 +0930; Good point Peter; not an appealing scenario for your average punter...where pragmatism and practicality rule the day. Perhaps limiting the Class-A PEP to 10 Watts and having a PA bias mode switch wou; /archives//html/Amps/2017-05/msg00098.html (9,577 bytes)
18. [Amps] HV MOSFETs for RF (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 9 May 2017 10:12:46 -0700; <Its not that simple. <My class A amp does 25W and consumes 280W continuously. <Who would buy a K3 then? 73 Peter eff. 10 / .25 = 40 watts input. Even my MK-V runs 25% eff in class A. pa need a serio; /archives//html/Amps/2017-05/msg00099.html (8,455 bytes)
19. [Amps] HV MOSFETs for RF (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 9 May 2017 10:39:42 -0700; <Good point Peter; not an appealing scenario for your average punter...where pragmatism and practicality rule the day. Perhaps limiting the Class-A PEP to 10 Watts and having a PA bias mode switch wo; /archives//html/Amps/2017-05/msg00100.html (10,319 bytes)
20. Re: [Amps] HV MOSFETs for RF (score: 1): Author: Shane Youhouse <kd6vxi@gmail.com>; Date: Tue, 9 May 2017 12:54:43 -0700; The efficiency goes to hell because all solid state amps I know of in ham TX are broadband. Therefore, they will ONLY have decent efficiency at the designed for level. 12 volt final, running at 50 wa; /archives//html/Amps/2017-05/msg00101.html (12,653 bytes)

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