Sec.  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  Sec. 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  Sec. 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  Sec. 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  Sec. 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  Sec. 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  Sec. 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]