QRP HF Amplifier

As mentioned in my last post, I’ve been working on building a small HF amplifier. I’d like to use it to build a standalone WSPR station that can run on its own, and transmit with a couple hundred milliwatts.

I don’t have the transmit portion completed, though I do have the code to run it done, so I don’t have a working model yet, however I did get some time to get the amplifier put together. It’s capable of about 250mW output, with 10mW input without generating too much heat.

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I designed the board to be able to accommodate up to four transistors in parallel, so with more heatsinking, I could use the same board on a higher output power model.

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