Bill,
Would you please explain this a little more?
I am having trouble getting my head wrapped around
"... a bunch of 250 watt modules which were combined
and switched in and out at an audio rate to produce
the modulation"
Just getting to my first cup of coffee ... and that's
my story and I'm stickin' to it.
Thanks - David KD4E
it's "relatively easy" to parallel properly designed circuits through
properly designed combiners for the power to be run that give excellent
linearity, rugged with minimal protective circuitry, and good efficiency
at a reasonable heat load that is easy to get rid of. (QUIET!)
REPLY:
A little OT but not much: Several years ago I was fortunate enough to
get a tour of KFI, the AM broadcast station in Southern California.
They were running a Harris DX50 transmitter which was all solid state
and produced 50 kW output. It uses a bunch of 250 watt modules which
were combined and switched in and out at an audio rate to produce the
modulation. No separate modulator.
Just shows what low power amps with combiners can do.
73, Bill W6WRT
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