I've been following this nice discussion, and want to ask something
about Ian's post, ¿what's bad with running exciter at a lower level and
to have the amplifier "seriously under-driven"? (it seems to be not only
a lower power output matter).
My modest guess is something related with operating points due to
distortion considerations, is it?.
Many thanks and have all a prosperous 2004
Guillermo - LU8EYW.
Ian White, G3SEK wrote:
R. Measures wrote:
** The grid does not and can not draw current when a competent
operator sets the grid potential just above the level where it can
draw grid-current with the max PEP drive that's available.
That is only true if the grid input circuit is guaranteed to be able
to soak up all possible levels of drive without allowing grid
current... but that also has disadvantages: either the exciter runs
flat-out and generates unnecessary IMD of its own, or else the exciter
runs at a lower level and the amplifier is seriously under-driven.
I truly cannot see why anyone should design (or defend) a
high-impedance bias supply whose voltage regulation will collapse at
the first trace of either normal or negative grid current. What's the
point, when a better-regulated supply is just as easy?
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