Sec. 97.121  Restricted operation.

    (a) If the operation of an amateur station causes general 
interference to the reception of transmissions from stations operating 
in the domestic broadcast service when receivers of good engineering 
design, including adequate selectivity characteristics, are used to 
receive such transmissions, and this fact is made known to the amateur 
station licensee, the amateur station shall not be operated during the 
hours from 8 p.m. to 10:30 p.m., local time, and on Sunday for the 
additional period from 10:30 a.m. until 1 p.m., local

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time, upon the frequency or frequencies used when the interference is 
created.
    (b) In general, such steps as may be necessary to minimize 
interference to stations operating in other services may be required 
after investigation by the FCC.

                      Subpart C--Special Operations