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1. [Amps] VHF amplifier input network (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Mon, 17 Dec 2007 17:52:59 +0900; Hello OMs. I am using a home brew made six-meter linear amplifier with a 3CX1200A7, pi input and pi-L output network. Now I have a difficulty to find a design/calculation method for the very popular; /archives//html/Amps/2007-12/msg00174.html (7,364 bytes)
2. Re: [Amps] VHF amplifier input network (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 18 Dec 2007 08:29:53 +0000; You can think of it as two back-to-back L networks. Analysing it in more detail... The net reactance of VC1-L1 is always inductive. (VC1 is simply a convenient way to make this reactance adjustable;; /archives//html/Amps/2007-12/msg00176.html (9,077 bytes)
3. Re: [Amps] VHF amplifier input network (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 20 Dec 2007 13:40:52 +0900; Thank you very much for the reply Ian. I realized that the network input - VC1 - L1 - VC2 - L2 - Cin//R can be written as input - C1 - L1 - L2 - C2+C3 - L3 - Cin - R where C1 and L1 is a series reson; /archives//html/Amps/2007-12/msg00181.html (7,880 bytes)
4. Re: [Amps] VHF amplifier input network (score: 1): Author: TexasRF@aol.com; Date: Thu, 20 Dec 2007 10:51:29 EST; The combination L1/C1 does NOT resonate at the operating frequency. The two components create a virtual inductance that becomes the series input arm of an L network that cascades with a second L netw; /archives//html/Amps/2007-12/msg00182.html (8,958 bytes)
5. Re: [Amps] VHF amplifier input network (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 21 Dec 2007 14:14:02 +0900; Gerald, thanks for the comment. Assuming the network type: input - C1 - L1 - L2 - C2+C3 - L3 - Cin+ R and excluding C1-L1, I think I have solved the network as a L-pi circuit. It is interesting that; /archives//html/Amps/2007-12/msg00183.html (8,431 bytes)

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