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;

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    (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]