jremington:
They all are, under Part 15 of the FCC rules, which govern low power unlicensed transmitters.
Thanks, I have shipepd a few tracker boards across to the US, I figured they were using 433Mhz.
Do the FCC publish the conversion that should be used to translate the power limits specified such as;
(125/3) x f(MHz) - (21250/3) µV/m @ 3 m
Into plain old mW that is used most devices data sheets ?