The parts are coming together.  Nice isolators direct from RFCI in CA, peak 1kW, 200W continuous, built in 100W dummy load

FETs. At six quid each, the MRFE6S9160HS makes a nice cheap 23cm PA, cellphone technology instead of broadcast devices

Hybrids. OK, I could use a printed Wilkinson as the input splitter, but hey…

Relays. The R570113030 is rather over-specified for this, but has 85dB isolation up to 1GHz and 80dB up to 2GHz and should handle up to 500W at 23cm very easily.

Tinplate boxes to screen the individual DF9IC PA boards

27V 18.6A switchmode PSU