Check out NG2E’s Pebble Crusher homebrew transmitter. Doug DeMaw would be enormously pleased.
Jack will no-doubt have this 250 mW rig on the some peak along the Shenandoah Valley, handing out QSOs to SOTA fans.
Jack’s blog page has a really nice video on this project:
https://jackhaefner.blogspot.com/2021/06/pebble-crusher-40m-xmtr.html
FYI = Pebble Crusher circuit board available from Far Circuits (farcircuits.net) $4.75 as of 06/29/21. -72 Bruce
Some other small circuit, a regen: https://siobhan10.github.io/MirrorRegen/