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1. Topband: pHEMT and MOSFET preamps and 1/f noise on 160 meters (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 22 Sep 2015 12:16:33 -0700; The KD9SV pHEMT FET preamp is a nice addition to the shack. I was able to do an in/out test this morning, and it made a big improvement. This was the first time since installation during the summer,; /archives//html/Topband/2015-09/msg00095.html (8,778 bytes)
2. Re: Topband: pHEMT and MOSFET preamps and 1/f noise on 160 meters (score: 1): Author: Art Snapper <art@nk8x.net>; Date: Tue, 22 Sep 2015 15:43:45 -0400; I have another preamp that uses an old MRF-904. Have you characterized that transistor at 1.8MHz? Is it worth replacing with a 2N5109? Art _________________ Topband Reflector Archives - http://www.co; /archives//html/Topband/2015-09/msg00096.html (9,084 bytes)
3. Re: Topband: pHEMT and MOSFET preamps and 1/f noise on 160 meters (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 22 Sep 2015 14:45:30 -0700; Art The MRF-904 in an antique microwave transistor. I can't imagine why anyone would use that device at 1.8 MHz. Those old transistors had a lot of base spreading resistance, often around 50 ohms. Th; /archives//html/Topband/2015-09/msg00097.html (8,043 bytes)
4. Re: Topband: pHEMT and MOSFET preamps and 1/f noise on 160 meters (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 22 Sep 2015 18:37:23 -0500; The NE46134 / 2SC4536 is part of that family. What do you think of it, Rick? www.mouser.com/ds/2/286/ne46134-607377.pdf 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://ww; /archives//html/Topband/2015-09/msg00098.html (7,998 bytes)

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