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Total 26 documents matching your query.

1. [Amps] New 2 PA design (score: 1): Author: "Michael Bales" <mbales@embarqmail.com>; Date: Tue, 12 Oct 2010 14:28:31 -0400; Hi - My name is Mike - kb8dlm. I have spent a couple of months researching HF solid state PA designs, and simply would like to bounce a few ideas off of people who have a bit more experience than mys; /archives//html/Amps/2010-10/msg00234.html (7,666 bytes)
2. [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Fri, 15 Oct 2010 18:18:53 +0200; Hi The power supply portion sounds good. Your selection of device is good and there is a lot on the net about them. A couple of SD2932 can be used as push pull single unit provided that you strap eac; /archives//html/Amps/2010-10/msg00235.html (7,419 bytes)
3. Re: [Amps] New 2 PA design (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 15 Oct 2010 13:45:09 -0400; Most commercial designs use two FETs in push pull and then combine the pairs, this has several advantages, the balanced collector/drain current cancels preventing saturating the output ferrites and t; /archives//html/Amps/2010-10/msg00238.html (8,255 bytes)
4. [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 15 Oct 2010 21:32:13 +0000 (UTC); Hi Mike, What about the ARF-1500, a pair will get you legal limit. There was a writeup in QEX on them, and I believe the ARF-1500 datasheet was written by a fellow ham. Paul, kg7hf just looking for; /archives//html/Amps/2010-10/msg00244.html (7,325 bytes)
5. Re: [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Fri, 15 Oct 2010 23:59:23 +0200; ARF1500 are very fine devices. few DL guys had built the published circuit and even Modified parts of it. There is a partial kit from the THP guys in Japan . They will supply 2 fets ,boards, and all; /archives//html/Amps/2010-10/msg00245.html (9,153 bytes)
6. Re: [Amps] New 2 PA design (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 16 Oct 2010 06:19:00 +0800; If use ARF1510/11 worked in SEPP or ARF1505 in P-P configattion, transformerless are possible, only needs a PFC unit.My teacher in the university, built a PFC unit what the out put volt below the inp; /archives//html/Amps/2010-10/msg00246.html (8,012 bytes)
7. Re: [Amps] New 2 PA design (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 16 Oct 2010 06:21:08 +0800; I remnember that APT(now microsemi) have an AN, it is transformerless design, Class C ,1kW output. -- Original Message -- From: "Hsu" <hsu4qro@gmail.com> To: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; /archives//html/Amps/2010-10/msg00247.html (8,148 bytes)
8. Re: [Amps] New 2 PA design (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 16 Oct 2010 06:27:14 +0800; http://www.microsemi.com/micnotes/APT9502.pdf and http://www.microsemi.com/micnotes/APT9701.pdf -- Original Message -- From: "Hsu" <hsu4qro@gmail.com> To: "Baruch Zilbershatz" <4z4rb@bezeqint.net> Cc; /archives//html/Amps/2010-10/msg00248.html (8,812 bytes)
9. Re: [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Sat, 16 Oct 2010 00:36:05 +0200; Never seen an app. Note for it. That German guy had it running great although He managed to blow one fet during setup. He had it framed on his shack wall! Baruch Zilbershatz Nitzanay-Oz 118 Nitzanay; /archives//html/Amps/2010-10/msg00249.html (9,314 bytes)
10. Re: [Amps] New 2 PA design (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 16 Oct 2010 06:48:09 +0800; Could you send me that German guy's detail? 73!Hsu -- Original Message -- From: "Baruch Zilbershatz" <4z4rb@bezeqint.net> To: "'Hsu'" <hsu4qro@gmail.com> Cc: <amps@contesting.com> Sent: Saturday, Oct; /archives//html/Amps/2010-10/msg00250.html (9,959 bytes)
11. Re: [Amps] New 2 PA design (score: 1): Author: Dan Levin <dan@andlev.com>; Date: Fri, 15 Oct 2010 17:43:19 -0700; The big issue with parts like the ARF-1500 is managing the heat. For high duty cycle use, like contesting or RTTY (or worse yet, contest RTTY :-) ), you are dealing with dissipating something like 15; /archives//html/Amps/2010-10/msg00252.html (8,701 bytes)
12. Re: [Amps] New 2 PA design (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Fri, 15 Oct 2010 21:06:00 -0400; The problem comes with the delta T through the heat sink compound, the silicon chip, and the transistor body. I think the lowest thermal compound (Highest thermal conductivity) is still arctic silver; /archives//html/Amps/2010-10/msg00253.html (10,076 bytes)
13. Re: [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 16 Oct 2010 01:24:16 +0000 (UTC); The title of the QEX article is "Get 1.5Kw from a new RF MOSFET: A legal limit HF linear, Tokyo Style" I think it's for members download only, but I found a copy here: http://www.google.com/url?sa=t&; /archives//html/Amps/2010-10/msg00254.html (8,805 bytes)
14. Re: [Amps] New 2 PA design (score: 1): Author: Peter <pc2a@pi4cc.nl>; Date: Sat, 16 Oct 2010 09:32:10 +0200; Hsu schreef: Found on google: http://www.mods-ham.com/03_Home-brew/Homebrew-Mods/ARF1500-PA/ARF_PA_DL6JI.pdf With call and tel number Peter PC2A http://www.pi4cc.nl __________________________________; /archives//html/Amps/2010-10/msg00257.html (8,626 bytes)
15. Re: [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Sat, 16 Oct 2010 09:41:22 +0200; I already sent Hsu all relevant files. Thank you. I have been playing lately with a new board that I designed with 8 ARF449. I am at very early stages. I want to try it since I have a pack of 100 pcs; /archives//html/Amps/2010-10/msg00258.html (9,053 bytes)
16. Re: [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 16 Oct 2010 22:20:24 +0000 (UTC); Hi Dan, You are right, heat and control are the primary issues to solve, and they can be solved in a solid state design just as they are in a tube design. When the QEX article came out, I contacted J; /archives//html/Amps/2010-10/msg00261.html (9,298 bytes)
17. Re: [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Sun, 17 Oct 2010 07:37:41 +0200; The DL guys that built that gizmo had it clamped with copper bars and screws both sides to a copper heat sink .looks great. One guy made his own Al heatsink from folded Al strips and on top of it had; /archives//html/Amps/2010-10/msg00264.html (10,261 bytes)
18. Re: [Amps] New 2 PA design (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 17 Oct 2010 02:21:25 -0400; I hope you mean "on top of it" as meaning "in addition to". Copper, the better heat transfer material goes *under* the finned aluminum heat sink. Putting the Aluminum first is like installing a resis; /archives//html/Amps/2010-10/msg00266.html (12,848 bytes)
19. Re: [Amps] New 2 PA design (score: 1): Author: "Baruch Zilbershatz" <4z4rb@bezeqint.net>; Date: Sun, 17 Oct 2010 08:26:00 +0200; Thank you for correction. In Hebrew it is very easy... Baruch Zilbershatz Nitzanay-Oz 118 Nitzanay -Oz 42836 ISRAEL phone: (+)972-052 8753838 screws both sides to a copper heat sink .looks great. had; /archives//html/Amps/2010-10/msg00267.html (13,323 bytes)
20. Re: [Amps] New 2 PA design (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 17 Oct 2010 07:57:05 +0100; I'm drifting off topic a little but is it not preferable for heat transfer purposes to run several lower power transistors in parallel to reduce hot spots? There is also the opportunity to have redun; /archives//html/Amps/2010-10/msg00268.html (12,491 bytes)

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