Sec. 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

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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.