hi all,
> Al KE3OK wrote:
> > Hi Gang, is there a formula or standard ratio of input
> to output? Does this ratio change for different
> amps/tubes/designs/modes/class?
i didn't reply to this, because i wasn't sure what al was asking. i
figured he'd get lots of responses, and he has... the answers have
been of two sorts, because his question can be interpreted two ways:
what is the ratio of output (rf) power to input (drive) power? this
is the "gain" of the amplifier, and is usually expressed in db
(that's simply ten times the log of the power ratio)
what is the ratio of output (rf) power to input (d.c. plate power)?
that ratio is the "anode efficiency" of the amplifier, and is usually
expressed in percent... (it's simply 100*RFpower out/[plate
voltage*plate current]) the "missing" power (the percentage of the
anode power supplied that doesn't come out as RF) is converted to
heat, mostly in the anode of the tube, but sometimes in tank coils,
plate parasitic suppressors, etc.
i hope this helps to clear up the different answers you're getting,
al.
vy 73,
George T. Daughters, K6GT
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