Sec. 73.669  TV stereophonic aural and multiplex subcarrier operation.

    (a) A TV broadcast station may without specific authority from the 
FCC, transmit multichannel aural programs upon installation of 
multichannel sound equipment. Prior to commencement of multichannel 
broadcasting, the equipment shall be measured in accordance with 
Sec. 73.1690(e).
    (b) Multiplex subcarriers may be used by a TV station pursuant to 
the provisions of Sec. 73.665 and may be transmitted on a secondary, 
non-interference basis to broadcast programming without specific 
authority from the FCC. Transmissions must be conducted in accordance 
with the technical standards given in Sec. 73.682(c).
    (c) In all arrangements entered into with outside parties affecting 
non-common carrier subcarrier operation, the licensee or permittee must 
retain control over all material transmitted over the station's 
facilities, with the right to reject any material which is deemed 
inappropriate or undesirable. Subchannel leasing arrangements must be 
kept in writing at the station and made available to the FCC upon 
request.

[ 49 FR 18106 , Apr. 27, 1984]