[Boatanchors] Short Wave Broadcast Folks:

[J. Forster]

With modern transmitters, pretty high.

They take the 3-phase, 60 Hz and FW rectify it. And build a power supply
that can be switched from 0, to full +, to full -, at carrier frequency.
This can be done at near 100% efficiency.

They build a stack of these, like a power D/A converter and synthesise the
AM carrier and mod by high speed switching.

I'd expect the efficiency to be near 100%.

FWIW,

-John

=================




> What's the "60 Hz to HF" power conversion efficiency?
> In other words- How many KiloWatt-hours does it
> take to run a 100KW transmitter for an hour?
> Anyone know?
>
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