Further confusion, 250 or 100?

[Rattan]

To add to the puzzles and uncertainties, while most of the time the violations read like this:

“Your operation on frequency 95.9 MHz was measured at 5,552 microvolts per meter (uV/m) at 82 meters. This exceeds the allowable unlicensed limit of 250 uV/m at 3 meters established in Part 15. Thus, this station is operating in violation of 47 U.S.C. S 301.”

every once in a while you’ll see one that goes:

“Your operation on frequency 88.1 MHz was measured at 72,816 microvolts per meter (uV/m) at 3 meters. This exceeds the allowable unlicensed limit of 100 uV/m at 3 meters established in Part 15. Thus, this station is operating in violation of 47 U.S.C. S 301.”

Now, admittedly the measurement in these cases was clearly very high (especially in the second case) and so maybe the question of that 150 uV/m difference is pretty academic. But for anyone actually trying to run legal, 100 is less than half of the 250 usually discussed as being the legal limit for the field strength, and I’d assume would be a difference in allowed FM range?

Daniel