§  73.1820   Station log.

   (a) Entries must be made in the station log either manually by a person
   designated by the licensee who is in actual charge of the transmitting
   apparatus, or by automatic devices meeting the requirements of
   paragraph (b) of this section. Indications of operating parameters that
   are required to be logged must be logged prior to any adjustment of the
   equipment. Where adjustments are made to restore parameters to their
   proper operating values, the corrected indications must be logged and
   accompanied, if any parameter deviation was beyond a prescribed
   tolerance, by a notation describing the nature of the corrective
   action. Indications of all parameters whose values are affected by the
   modulation of the carrier must be read without modulation. The actual
   time of observation must be included in each log entry. The following
   information must be entered:

   (1) All stations. (i) Entries required by § 17.49 of this chapter
   concerning any observed or otherwise known extinguishment or improper
   functioning of a tower light:

   (A) The nature of such extinguishment or improper functioning.

   (B) The date and time the extinguishment or improper operation was
   observed or otherwise noted.

   (C) The date, time and nature of adjustments, repairs or replacements
   made.

   (ii) Any entries not specifically required in this section, but
   required by the instrument of authorization or elsewhere in this part.

   (iii) An entry of each test and activation of the Emergency Alert
   System (EAS) pursuant to the requirement of part 11 of this chapter and
   the EAS Operating Handbook. Stations may keep EAS data in a special EAS
   log which shall be maintained at a convenient location; however, this
   log is considered a part of the station log.

   (2) Directional AM stations without an FCC-approved antenna sampling
   system (See § 73.68). (i) An entry at the beginning of operations in
   each mode of operation, and thereafter at intervals not exceeding 3
   hours, of the following (actual readings observed prior to making any
   adjustments to the equipment and an indication of any corrections to
   restore parameters to normal operating values):

   (A) Common point current.

   (B) When the operating power is determined by the indirect method, the
   efficiency factor F and either the product of the final amplifier input
   voltage and current or the calculated antenna input power. See
   § 73.51(e).

   (C) Antenna monitor phase or phase deviation indications.

   (D) Antenna monitor sample currents, current ratios, or ratio deviation
   indications.

   (ii) Entries required by § 73.61 performed in accordance with the
   schedule specified therein.

   (iii) Entries of the results of calibration of automatic logging
   devices (see paragraph (b) of this section) or indicating instruments
   (see § 73.67), whenever performed.

   (b) Automatic devices accurately calibrated and with appropriate time,
   date and circuit functions may be utilized to record entries in the
   station log Provided:

   (1) The recording devices do not affect the operation of circuits or
   accuracy of indicating instruments of the equipment being recorded;

   (2) The recording devices have an accuracy equivalent to the accuracy
   of the indicating instruments;

   (3) The calibration is checked against the original indicators as often
   as necessary to ensure recording accuracy;

   (4) In the event of failure or malfunctioning of the automatic
   equipment, the person designated by the licensee as being responsible
   for the log small make the required entries in the log manually at that
   time;

   (5) The indicating equipment conforms to the requirements of § 73.1215
   (Indicating instruments--specifications) except that the scales need
   not exceed 5 cm (2 inches) in length. Arbitrary scales may not be used.

   (c) In preparing the station log, original data may be recorded in
   rough form and later transcribed into the log.

   [ 43 FR 45854 , Oct. 4, 1978, as amended at  44 FR 58735 , Oct. 11, 1979;
    47 FR 24580 , June 7, 1982;  48 FR 38481 , Aug. 24, 1983;  48 FR 44806 ,
   Sept. 30, 1983;  49 FR 33603 , Aug. 23, 1984;  58 FR 44951 , Aug. 25, 1993;
    59 FR 67102 , Dec. 28, 1994;  60 FR 55482 , Nov. 1, 1995]