[Amps] Grounded grid matching circuit

Mike Lucas W5CHR at Bellsouth.net
Fri Apr 16 16:56:01 PDT 2010


In the March 1978 HAM RADIO magazine, Ulrich Rohde wrote about an 
elliptic filter covering the amateur bands
from 1.8 to 30MHz, suitable for an input circuit to an amp needing a 50 
ohm to 100 ohm stepup. A corrected
schematic was published in the August 1978 SHORT CIRCUITS. I have run 
the numbers through Jim Tonne's
software, and the results (both the original circuit and the corrected 
one) don't look anywhere near flat enough to
work. VSWR is wild and off the charts! I'd  bet good money that Rohde  
was right and I blithered somewhere, but
I haven't found where yet. Has anyone in the audience seen the article, 
and what were your conclusions?
Anyone? Anyone?

Mike W5CHR
Memphis


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