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

["qrv@kd4e.com" <qrv@kd4e.com>]

Is this an example of what is being discussed?

http://www.fmamtv.com/products/Radio/BE%20AM10A.html

> 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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