An HF Amplifier for your QRP Rig

During our Sunday night Tech Net in Northern Virginia one of the participants described a 140 watt amplifier he just finished building for use on the HF bands.

My immediate thought was “Hmmm, he already has a 100 watt style typical HF radio. Why does he need something that does 140 watts?”

The I remembered he also has a QRP rig which generates the typical 5 watts or so and this linear amplifier allows this QRP rig to be just like the typical 100 watt radios when you need or want it.

The amplifier concept comes from a company called…

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