In article ,
David wrote:
These are ion the same ISM frequency as microwave ovens (2450 mHz as I
recall). Satellite radio is the closest licensed service that may be
affected. A part 15/ISM device may not cause interference to a
licensed service.

Part 18 covers a whole series of bands, mostly HF and Microwave, and
a pretty much blanket use of LF. (For LF, the important part is how
much crud you put back into the powerline). For HF, the bands are
6.78 MHz +/- 15 kHz,
13.56 MHz +/- 7 kHz,
27.12 MHz +/- 163 Khz. (Yup, Citizens Band)

It's got my favorite line that I've found so far in the regs.

18.306a "ISM equipment operating on a frequency specified in (paragraph)
18.301 is permitted unlimited radiated energy in the band specified for
that frequency". (You're not allowed to modulate any information on it,
though).

Mark Zenier Washington State resident