He’s building his own linear amplifiers on what looks like sheets ... Good question, but it appears that there’s more than enough power to drive a long-range transmitter.

so [ElectroBoy]’s dual voltage PSU board for audio amplifiers is worth a second look. This type of linear power supply has an extremely simple circuit consisting of a transformer, bridge ...

Guerrilla RF’s GRF5509 high-performance power amplifier paired with Impinj ... The GRF5509 delivers up to 2 watts of linear power while meeting the stringent spectral mask requirements required ...