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
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|