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1. Topband: high power filters (score: 1): Author: "Dick" <knaap159@zonnet.nl>; Date: Mon, 27 Feb 2006 20:22:53 +0100; Just to come back on the filter question. I want something that I can use behind a 160m MOSFET amplifier, which haven't much filtering in the output. The amp has to be runned in a multi-multi station; /archives//html/Topband/2006-02/msg00222.html (6,773 bytes)
2. Re: Topband: high power filters (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 28 Feb 2006 06:01:24 -0500; amplifier, which You won't be able to use stubs. They make terrible filters. The Q is very low, the losses high, and the space requirements are bad for HF bands. They have poor to no filtering on hi; /archives//html/Topband/2006-02/msg00230.html (8,595 bytes)
3. Topband: high power filters (score: 1): Author: "Dick and Adele Bingham" <binghamstehekin@starband.net>; Date: Tue, 28 Feb 2006 09:39:03 -0800; Greetings everyone See my comments below ==> ......................................................... Message: 4 Date: Tue, 28 Feb 2006 06:01:24 -0500 From: "Tom Rauch" <w8ji@contesting.com> Subject; /archives//html/Topband/2006-02/msg00232.html (8,636 bytes)
4. Re: Topband: high power filters (score: 1): Author: "Jeff Maass" <jmaass@columbus.rr.com>; Date: Tue, 28 Feb 2006 14:20:14 -0500; You might also consider the commercial solution offered by W3NQN and sold by WX0B at Array Solutions. rated 2 kW. Not cheap ($520), but available off-the-shelf. http://arraysolutions.com/Products/wx; /archives//html/Topband/2006-02/msg00233.html (9,156 bytes)
5. Re: Topband: high power filters (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 28 Feb 2006 12:01:02 -0800 (PST); You normally want an inductor input filter so that the FET can clip if it wants to, but no current will be drawn at harmonic frequencies. For a given peak to peak voltage, a square wave has 16/( pi s; /archives//html/Topband/2006-02/msg00234.html (8,264 bytes)
6. Re: Topband: high power filters (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 1 Mar 2006 05:38:34 -0500; can harmonic wave that gives The reason you see capacitor input filters used is the overwhelmingly common transient damage mechanism of an FET is excessive voltage. FET's can take dozens of times ra; /archives//html/Topband/2006-03/msg00004.html (8,127 bytes)
7. Topband: High Power Filters (score: 1): Author: "George Cutsogeorge" <w2vjn@rosenet.net>; Date: Wed, 1 Mar 2006 08:34:12 -0800; There is a very simple, inexpensive way to build high power, low pass filters. I described this method in the Nov/Dec 1998 NCJ in my article titled "High Power Harmonic Filters". Basically, you desig; /archives//html/Topband/2006-03/msg00006.html (7,827 bytes)

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