On Sun, 01 Nov 1998 21:34:18 Scott Townley <nx7u@primenet.com> writes:
>
>Just following the thread on the reflector.
>>From the description it doesn't sound any different in principle to
>the
>"supercathode" drive I was squawking about earlier this fall.
>Supercathode: drive grid and cathode together, ground screen so
>Esc=-drive
>voltage
>G2DAF: drive grid and screen together, but multiply screen up.
>Esc=k*drive
>voltage
>
>Now I don't have any original G2DAF literature, but by the above (and
>only
>that) I have no difficulty believing the linearity claims of
>G2DAF...Eimac
>themselves measured IM3 products on the order of -40dB or better with
>the
>supercathode drive technique.
QST July 1967 had a Bill Orr article on Super Cathode while he was still
with Eimac. Measurements on a 4CX300A tetrode showed -46/-49 dB 3rd and
5th IMD. At the end of the article the G2DAF circuit was mentioned as the
subject of a follow up article....has anyone knowledge of publication?
HRM November 1986 had a Bill Orr column on a Super Cathode 4-400A with
references to his 1967 QST article and another QST November 1959 article
by other authors.
A Bill Orr Eimac newsletter AS-1 dated June 1983 on GG triodes briefly
mentioned Super Cathode tetrodes but no references.
73 Carl KM1H
SNIPPED
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