47 CFR § 73.4246
Stereophonic pilot subcarrier use during monophonic programming
February 16, 2021
See Report and Order, Docket 19571, FCC 73-680, adopted June 21, 1973. 41 FCC 2d 534; 38 FR 17021, June 28, 1973.
[47 FR 3792, Jan. 27, 1982]