Sec.  73.691   Visual modulation monitoring.

   (a) Each TV station must have measuring equipment for determining that the
   transmitted visual signal conforms to the provisions of this subpart. The
   licensee shall decide the monitoring and measurement methods or procedures
   for indicating and controlling the visual signal.

   (b) In the event technical problems make it impossible to operate in
   accordance with the timing and carrier level tolerance requirements of
    Sec. 73.682 (a)(9)(i), (a)(9)(ii), (a)(12), (a)(13), and (a)(17), a TV broadcast
   station may operate at variance for a period of not more than 30 days
   without specific authority from the FCC: provided that, the date and time of
   the initial out-of-tolerance condition has been entered in the station log.
   If the operation at variance will exceed 10 consecutive days, a notification
   must be sent to the FCC in Washington, D.C., not later than the 10th day of
   such operation. In the event normal operation is resumed prior to the end of
   the 30 day period, the licensee must notify the FCC upon restoration of
   normal operation. If causes beyond the control of the licensee prevent
   restoration of normal operation within 30 days, a written request must be
   made to the FCC in Washington, D.C., no later than the 30th day for such
   additional time as may be necessary.

   [ 60 FR 55480 , Nov. 1, 1995]