Re: [Amps] Time to back up- SS and autotune

["Roger (K8RI)" <k8ri@rogerhalstead.com>]

That is becoming common practice. Modular transmitters.  Just plug in 
the modules you want to get the power you want and I believe they have 
been hot swappable for some time. .
I had never thought of switching the modules in and out, but at 250 W 
per step it'd be a pretty smooth transition, albeit they may do some 
filtering.  I wonder about switching pulses?
73

Roger (K8RI)

On 12/17/2016 9:36 AM, Bill Turner wrote:
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Sat, 17 Dec 2016 05:37:07 -0500, K8RI wrote:
>
> > 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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