§  18.111   General operating conditions.

   (a) Persons operating ISM equipment shall not be deemed to have any
   vested or recognizable right to the continued use of any given
   frequency, by virtue of any prior equipment authorization and/or
   compliance with the applicable rules.

   (b) Subject to the exceptions in paragraphs (c) and (d) of this section
   and irrespective of whether the equipment otherwise complies with the
   rules in this part, the operator of ISM equipment that causes harmful
   interference to any authorized radio service shall promptly take
   whatever steps may be necessary to eliminate the interference.

   (c) The provisions of paragraph (b) of this section shall not apply in
   the case of interference to an authorized radio station or a
   radiocommunication device operating in an ISM frequency band.

   (d) The provisions of paragraph (b) of this section shall not apply in
   the case of interference to a receiver arising from direct intermediate
   frequency pickup by the receiver of the fundamental frequency emissions
   of ISM equipment operating in an ISM frequency band and otherwise
   complying with the requirements of this part.