Goto Section: 73.318 | 73.322 | Table of Contents
FCC 73.319
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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]
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Goto Section: 73.318 | 73.322
Goto Year: 2014 |
2016
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