George Smart - M1GEO

An online scrapbook full of half-baked projects and silly ideas.

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1W PA for 10MHz

This 1 watt class-C amplifier was designed for use on the 10 MHz (30 metre) band. It has been used with my RTTY and QRSS projects. Anything that does not require it to be linear.

I have not yet had time to digitise the schematic, so it’s offered here as a hand-drawn diagram. The output matching network is also a first-order low-pass filter.

Schematic

To test the design worked in concept, I make a version of the amplifier in Manhattan style, and can confirm it does indeed work. I added a slightly larger heat-sink to the 2N3866 to better cool it.

Picture

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