Re: Semi-OT: seeking circuit designs for 2 meter LPF

Posted by G3TCT on May 13, 2010; 9:50am
URL: http://elecraft.85.s1.nabble.com/Semi-OT-seeking-circuit-designs-for-2-meter-LPF-tp5041223p5045766.html

Hi Lew
You could try a coax stub filter - see the one by G4SWX and described on the
G(M)3SEK website
http://www.ifwtech.co.uk/g3sek/in-prac/index.htm
(Look for "Filters: Harmonic notch filters" under "The Best of In
Practice").

I built one for 70MHz using RG58 and it works fine at 160W.  The article
recommends using RG213 for 500W.

This looks a lot easier than messing about with metalwork and Ls and Cs.

73
Graham


> There's a good design for a kilowatt-capable 6 meter low pass filter in
the ARRL Handbook (2007), but I haven't found a design for a 2 meter LPF
filter that I really like.

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