yes....but filaments (and indirectly heated cathodes) have inductance and
capacitance of their own....thats why it changes impedance as the frequen=
cy
changes.=0D
73=0D
STEVEN GRANT W4IIV=0D
=0D
-------Original Message-------=0D
=0D
From: carl seyersdahl=0D
To: <amps@contesting.com>
Date: Friday, March 22, 2002 11:01:41 AM=0D
To: amps=0D
Subject: [Amps] AMPS=0D
=0D
I received a number of replies to my question about figuring impedances f=
rom=0D
known values of a pi-network, and I wish to thank all who responded!!=0D
However, the answers I got make it look as though the input impedance of =
an=0D
amp (at the cathode feedpoint) changes as the frequency changes!! This=0D
doesn't seem to be right because the driving power , the amount needed at=
=0D
the feedpoint, should remain constant insofar as the k-g voltage requirem=
ent=0D
would always be the same for a given amount of output power. This is the =
way=0D
it seems to me, BUT,=0D
you may correct me if I'm wrong.(it wouldn't be the first time , I=0D
reckon!!) (and maybe not the last either!!)=0D
any comments??? Thanks=0D
carl / kz5ca=0D
=0D
_______________________________________________=0D
Amps mailing list=0D
Amps@contesting.com=0D
http://lists.contesting.com/mailman/listinfo/amps=0D
=2E
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