** Dave -- Why not design a 90% efficient linear amplifier for the HF
Ham bands, document the construction process, and show us how to on your
Web site.
>In the late 1980s, one of the engineers I worked with
>had recently come from Continental Electronics of
>Dallas, TX. The most recent transmitter design on
>which he had worked at Continental was a multi-hundred
>kW rig. It used a solid-state switchmode plate/screen
>modulation, with loop feedback to keep the distortion
>low. The transmitter was capable of operation from AM
>BC (not legal in the US at that power level) to in
>excess of 20MHz. Because of the custom nature of such
>large transmitters, it was, of course, not
>band-switched. Rather, the purchaser specified the
>operating frequency.
>
>However, the techniques, without question, could lend
>themselves to a band-switched design. And there's
>nothing preventing such techniques when the RF devices
>are solid state.
>
>There is nothing inherent in a high efficiency
>broadcast design that renders it narrowband.
>
>Complex? Yes. Technically difficult? No.
>
>73,
>
>Dave W8NF
>
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