1
The RF Workbench / What's the highest frequency people have tested IRF series MOSFETs?
« on: June 07, 2024, 2351 UTC »
Not sure where I saw the schematic but there was one someone made showing it was possible
to get around 5W(?) out on the low side of the FM broadcast band. Can't remember if it was the
IRF510 but it was in that ballpark. I'm sure the efficiency would be laughable but possibly still
useful.
I'd think the gate capacitance would become so high that they would be useless in the lower VHF
range but I've never actually tried to see the limits.
Seems there are hams who use them in the 6m band so if they can do 50MHz that begs the question
where will the maximum usable frequency of amplification become basically unity gain (if I should
call it that), or useful amount of amplification before it's useless?
to get around 5W(?) out on the low side of the FM broadcast band. Can't remember if it was the
IRF510 but it was in that ballpark. I'm sure the efficiency would be laughable but possibly still
useful.
I'd think the gate capacitance would become so high that they would be useless in the lower VHF
range but I've never actually tried to see the limits.
Seems there are hams who use them in the 6m band so if they can do 50MHz that begs the question
where will the maximum usable frequency of amplification become basically unity gain (if I should
call it that), or useful amount of amplification before it's useless?