Ideas for a 2m (144 MHz) WSPR / FT8 beacon

I am posting an early design sketch of a 2m WSPR beacon.

Key Points

• 25 MHz HCI 0.5ppm TCXO powering the Si5351 module instead of the 26 MHz TCXO. If this fails, we can use a 10 MHz OCXO instead (a bit out of spec but works fine).
• Tokmas CID10N65F GaN FET might work @ 144 MHz as the 'final'. If not, use Mitsubishi RD15HVF1-501 MOSFET as backup.
• 2SK3475 as the driver with variable DC bias at the gate
• The whole VCC to this amplifier will be PTT switched
• Ideally, we would want to keep the driver stage linear but the final stage as switched (Class C/D) Alternate: Perhaps by DC coupling the Si5351 input to 2SK3475, we can avoid the need for DC gate bias
• The "RFC" (bifilar coil still needed?) part will need to be figured out for VHF!

Status

Results: To be built and tested soon!

Update: There is NO 2m "SSB / FT8 / WSPR" traffic in India it seems.

Update 2: See RFZero PA 50 MHz for inspiration!