I read somewhere that the radarless f35s were because of fuselage-mounting issue, not GaN related issue, that makes it much worse.
They said that the new AN/APG-85 radar has a different bolt pattern to mount it to the plane than the old AN/APG-81, and thus the new F-35 which have a mounting plate to accept AN/APG-85 cannot be fitted with AN/APG-81.
But they stopped making enough AN/APG-81 and transitioned to AN/APG-85 and the production of that one isn't going well.
Fixing this mounting plate issue apparently takes 2 years.
Now it is up to everyone to believe or not to believe that the issue is:
- holes being in the wrong spot in some sheet metal
- gallium supply
- gallium nitride on silicon carbide semiconductor manufacturing yield issues
I read an article a couple years ago from some semiconductor expert about leading edge process, that is the smallest and fastest transistors for CPU, GPU, etc stuff, and back then that was i think 14 or 7nm.
These processes require 65,000 manufacturing steps. If one step goes wrong, the wafer is trash.
The flatness of the wafers is basically atom-perfect, the water (of which they need insane amounts) is basically perfectly pure, same goes for various chemicals, the machines vaporize 50,000 droplets of liquid zinc per second, which fall through a vacuum chamber with a laser to create light pulses ... It's crazy technology frankly.
The big machines from ASML you see is the tip of the ice berg, there are multiple "subfloors" full of support equipment providing chemicals, ultra clean water, air, specially modulated power and whatnot.
Making gallium nitride power amplifiers is much simpler than CPUs of course, but it still seems to me drilling a couple more holes in an F-35 aluminium bulkhead or manufacturing an adapter plate might be doable under 2 years.
But who knows, it is American MIC, nothing they can't make complicated, late and expensive.