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

To: amps@contesting.com
Subject: Re: [Amps] Time to back up- SS and autotune
From: "qrv@kd4e.com" <qrv@kd4e.com>
Reply-to: qrv@kd4e.com
Date: Sat, 17 Dec 2016 14:36:56 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.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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