I was thinking about having a go at contriving (I won't say
"designing" for obvious reasons) a class 'C' RF amp using MOSFETs
instead of the usual BJTs/toobz. They seem - on the face of it at
least - ideally suited to the task. I'm just a bit concerned about
whether even the fastest ones would be fast enough, even given
adequate gate drive. I'd be surprised if they weren't good for at
least a few Mhz., but am quite frankly clueless as to MUF. Anyone
know?
=================================
MOSFETS can be used for RF applications provided the input and output
capacitance is sufficiently low.
I recently bought a power module from a surplus store with 48 pcs HUF76143P3
Hi-speed MOSFET in a TO220 package ,all for Euro 4.00 (just under US$5.-)
The relevant spec sheet says Input cap.= 3900pf , Output cap.=1600pF
,useful up to 1 MHz.

Most MOSFET studded RF power amps circuits I have come across are equipped
with IRFxxx range of devices.

Frank GM0CSZ / KN6WH