[Amps] Grounded grid matching circuit

[Carl]

He later retracted that design saying it was not workable in actual dynamic 
use.

Carl
KM1H


----- Original Message ----- 
From: "Mike Lucas" <W5CHR at Bellsouth.net>
To: <amps at contesting.com>
Sent: Friday, April 16, 2010 7:56 PM
Subject: [Amps] Grounded grid matching circuit


> 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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