Hi Stefan, Robert,
This amplifier seems very tough to tame in the region we want it.
This is what I get when adding some small source inductance (2x 1nH parallel), and a drain stab resistor of 100 Ohm.
Even with this quite low resistor the unstable region between 14 and 15 GHz is right at the optimium noise figure for 8.4 GHz confirming your experiments Stefan.
Kevin
