Goto Section: 73.318 | 73.322 | Table of Contents
FCC 73.319
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 73.319 FM multiplex subcarrier technical standards.
(a) The technical specifications in this Section apply to all
transmissions of FM multiplex subcarriers except those used for
stereophonic sound broadcasts under the provisions of § 73.322.
(b) Modulation. Any form of modulation may be used for subcarrier
operation.
(c) Subcarrier baseband. (1) During monophonic program transmissions,
multiplex subcarriers and their significant sidebands must be within
the range of 20 kHz to 99 kHz.
(2) During stereophonic sound program transmissions (see § 73.322),
multiplex subcarriers and their significant sidebands must be within
the range of 53 kHz to 99 kHz.
(3) During periods when broadcast programs are not being transmitted,
multiplex subcarriers and their significant sidebands must be within
the range of 20 kHz to 99 kHz.
(d) Subcarrier injection. (1) During monophonic program transmissions,
modulation of the carrier by the arithmetic sum of all subcarriers may
not exceed 30% referenced to 75 kHz modulation deviation. However, the
modulation of the carrier by the arithmetic sum of all subcarriers
above 75 kHz may not modulate the carrier by more than 10%.
(2) During stereophonic program transmissions, modulation of the
carrier by the arithmetic sum of all subcarriers may not exceed 20%
referenced to 75 kHz modulation deviation. However, the modulation of
the carrier by the arithmetic sum of all subcarriers above 75 kHz may
not modulate the carrier by more than 10%.
(3) During periods when no broadcast program service is transmitted,
modulation of the carrier by the arithmetic sum of all subcarriers may
not exceed 30% referenced to 75 kHz modulation deviation. However, the
modulation of the carrier by the arithmetic sum of all subcarriers
above 75 kHz may not modulate the carrier by more than 10%.
(4) Total modulation of the carrier wave during transmission of
multiplex subcarriers used for subsidiary communications services must
comply with the provisions § 73.1570(b).
(e) Subcarrier generators may be installed and used with a type
accepted FM broadcast transmitter without specific authorization from
the FCC provided the generator can be connected to the transmitter
without requiring any mechanical or electrical modifications in the
transmitter FM exciter circuits.
(f) Stations installing multiplex subcarrier transmitting equipment
must ensure the proper suppression of spurious or harmonic radiations.
See § § 73.317, 73.1590 and 73.1690. If the subcarrier operation causes
the station's transmissions not to comply with the technical provisions
for FM broadcast stations or causes harmful interference to other
communication services, the licensee or permittee must correct the
problem promptly or cease operation. The licensee may be required to
verify the corrective measures with supporting data. Such data must be
retained at the station and be made available to the FCC upon request.
[ 48 FR 28455 , June 22, 1983, as amended at 48 FR 37216 , Aug. 17, 1983;
49 FR 15080 , Apr. 17, 1984; 49 FR 38131 , Sept. 27, 1984; 50 FR 1534 ,
Jan. 11, 1985; 51 FR 17029 , May 8, 1986; 57 FR 48333 , Oct. 23, 1992]
Goto Section: 73.318 | 73.322
Goto Year: 2010 |
2012
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