The Continental supplies do this, and also can switch on and off at 70 Khz or
so, so as to be able to recreate audio voltage at the anode of a PA tube.This
does high level plate modulation.
I'm working with one that will make 45 kV, at 40 Amps, without handling audio
control voltage. It is strictly the plate voltage power supply. It has 96 x 1.2
kV modules stacked in series. The big transformers each have multitude of
isolated secondary windings. Some are turned off at all times, but the exact
modules that are 'zeroed' move around the circuit. Four transformers each about
6 feet long, 5 feet tall, with 24 windings on each one. Primary voltage is 4160
VAC three phase. It is a big power supply, walk in with chain link fencing
around it.
73
John
K5PRO
> Message: 2
> Date: Sun, 12 Apr 2009 13:59:25 -0400
> From: "Jim Tonne" <Tonne@Comcast.net>
> Subject: Re: [Amps] Power supply question
> To: "Alex Eban" <alexeban@gmail.com>, "'Mike Saculla'" <fqm@msn.com>,
> "'amps@contesting'" <amps@contesting.com>
> Alex wrote in part:
>
> > Peter Dahl, designed for me a PS transformer with
> > 6 separate secondaries, each one producing 400VDC after
> > rectification.
>
> What a beautiful candidate for a pulse-width modulator for
> AM or Kahn-method SSB! That is precisely what the
> 500 kW shortwave transmitters by Continental do. 48
> separate 700 volt supplies, all stacked in series. Each
> such supply has its own pulse-width modulator.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|