-----Original Message-----
From: owner-amps@contesting.com
[mailto:owner-amps@contesting.com]On
Behalf Of Tom Rauch
Sent: Wednesday, October 03, 2001 3:04
PM
To: KD4LYH; amps@contesting.com; Phil
Clements; PAUL HEWITT
Subject: RE: [AMPS] YC-156 Input
impedance
> Do you know what values were used to
> establish the load line used in your
> Chaffe analysis?
yes.
Thank you for those figures
> With fixed tuned input networks,
> "ballpark" figures are of no use.
They certainly are.
You have to start somewhere. Anyone who
thinks he can do a
paper design or look at a operating
sheet and not tweak anything is
living in dream-land.
So lets get in the ball park. 1500-3000
watts of output instead of the 10-14
thousand watts output quoted. My Chaffe
analysis software for the yc-156 gives
me an input impedance value of 40 ohms
at 5kv plate voltage and 3KW output and
it climbs to 47 ohms as I lower the
output to power to 1500 watts, (VBmin
1200v both cases). If your software will
give an answer for this lower output
power could you please pass it along.
Dreamland to me is not doing the math
and "lifting" values from a data sheet
using an entirely different set of
operating parameters than I plan to use.
Input network tweaking is required but
(hopefully) not 25% or more or I've
missed something on the paper design.
Paul Hewitt
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