[Code of Federal Regulations]
[Title 47, Volume 2]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR73.69]

[Page 28-29]
 
                       TITLE 47--TELECOMMUNICATION
 
        CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)
 
PART 73_RADIO BROADCAST SERVICES--Table of Contents
 
                     Subpart A_AM Broadcast Stations
 
Sec.  73.69  Antenna monitors.

    (a) Each station using a directional antenna must have in operation 
at the transmitter site an FCC authorized antenna monitor.
    (b) In the event that the antenna monitor sampling system is 
temporarily out of service for repair or replacement, the station may be 
operated, pending completion of repairs or replacement, for a period not 
exceeding 120 days without further authority from the FCC if all other 
operating parameters, and the field monitoring point values are within 
the limits specified on the station authorization.
    (c) If conditions beyond the control of the licensee prevent the 
restoration of the monitor to service within the allowed period, an 
informal letter request in accordance with Sec.  73.3549 of the 
Commission's rules must be filed with the FCC, Attention: Audio 
Division, Media Bureau in Washington, DC for such additional time as may 
be required to complete repairs of the defective instrument.
    (d) If an authorized antenna monitor is replaced by another antenna 
monitor, the following procedure shall be followed:
    (1) Temporary authority shall be requested and obtained from the 
Commission in Washington to operate with parameters at variance with 
licensed values, pending issuance of a modified license specifying new 
parameters.
    (2) Immediately before the replacement of the antenna monitor, after 
a verification that all monitoring point values and the common point 
current reading are within the limits or tolerances specified in the 
rules, the following indications must be recorded for each radiation 
pattern: Final plate current and plate voltage, common point current, 
antenna monitor phase and current indications, and the field strength at 
each monitoring point.
    (3) With the new monitor substituted for the old, all indications 
specified in paragraph (d)(2) of this section, again must be read. If no 
change has occurred in the indication for any parameter other than the 
indications of the antenna monitor, the new antenna monitor indications 
must be deemed to be those reflecting correct array adjustments.
    (4) If it cannot be established by the observations required in 
paragraph (d)(2) of this section that the common point current reading 
and the monitoring point values are within the tolerances or limits 
prescribed by the rules and the instrument of authorization, or if the 
substitution of the new antenna monitor for the old results in changes 
in these parameters, a partial proof of performance shall be executed 
and analyzed in accordance with Sec.  73.154.

[[Page 29]]

    (5) An informal letter request for modification of license shall be 
submitted to the FCC, Attention: Audio Division, Media Bureau in 
Washington, DC within 30 days of the date of monitor replacement. Such 
request shall specify the make, type, and serial number of the 
replacement monitor, phase and sample current indications, and other 
data obtained pursuant to this paragraph (d).
    (e) The antenna monitor must be calibrated according to the 
manufacturer's instructions as often as necessary to ensure its proper 
operation.

(Secs. 4, 5, 303, 48 Stat., as amended, 1066, 1068, as amended, 1082, as 
amended; 47 U.S.C. 154, 303. Interpret or apply secs. 301, 303, 307, 48 
Stat. 1081, 1082, as amended, 1083, as amended, 47 U.S.C. 301, 303, 307)

[38 FR 1918, Jan. 19, 1973]

    Editorial Note: For Federal Register citations affecting Sec.  73.69 
see the List of CFR Sections Affected, which appears in the Finding Aids 
section of the printed volume and on GPO Access.