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Total 3 documents matching your query.

1. [Amps] HF power amp input impedance (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 05 Apr 2009 20:53:37 -0700; I have an older solid state amp based on a pair of MRF 454s. The amp is missing three common design features found in most similar HF power amps, a bias circuit for the base, negative feedback, and a; /archives//html/Amps/2009-04/msg00066.html (7,405 bytes)
2. Re: [Amps] HF power amp input impedance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 07 Apr 2009 07:49:15 +0100; Whether it's bipolars of FETs, set the bias point by monitoring the current drawn and adjusting the bias voltage to get the current you want. Applying some nominal bias voltage to devices when you d; /archives//html/Amps/2009-04/msg00072.html (7,868 bytes)
3. Re: [Amps] HF power amp input impedance (score: 1): Author: Pat Villani <patv@monmouth.com>; Date: Tue, 7 Apr 2009 06:40:31 -0400; I have some experience with transistor power amps. Unfortunately it's been with UHF and microwave amplifiers which are a little different to work with, so I'll answer where I can. See below. Pat WB2G; /archives//html/Amps/2009-04/msg00073.html (9,813 bytes)

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