Sec. 23.17  Frequency measurement.

    Each station shall provide for the measurement of all frequencies 
assigned thereto, and establish a procedure for checking them regularly. 
These measurements shall be made by means independent of the frequency 
control of the transmitter and shall be of accuracy sufficient to detect 
deviation from the assigned frequency within one-half of the allowed 
tolerance. A record shall be kept of the results and dates of all 
frequency measurements.
[ 38 FR 22480 , Aug. 21, 1973]