§74.502. Frequency assignment. — Inbound Citations

(2) If the transmitter modulates two or more carriers, with at least one using digital modulation and one using frequency or other analog modulation, digital modulation techniques are considered as being employed when the necessary bandwidth of the digital signal(s) is 50 percent or more of the aggregate bandwidth of the system, comprising the digital necessary bandwidth(s), the analog necessary bandwidth(s), and any bandwidth(s) between the digital and analog necessary bandwidths. In this case, the aggregate bandwidth shall be used for the authorized bandwidth (B) in paragraph (a) of this section, and for purposes of compliance with the bandwidth limitations in § 74.502 of this subpart; and the sum of the powers of the analog and digital signals shall be used for mean transmitter power (PMEAN) in paragraph (a) or the peak envelope transmitter power (PPEAK) in paragraph (b) of this section, and for purposes of compliance with the power limitations in § 74.534 of this subpart.

(139) US139 In the band 18.3-19.3 GHz, earth station licensees in the fixed-satellite service (space-to-Earth) may require that licensees of grandfathered stations in the fixed service cease operations in accordance with the provisions in § 101.95 of this chapter.

(a) FSS licensees may require the incumbent to cease operations, provided that the FSS licensee turns on a system within interference range of the incumbent, as determined by TIA Bulletin 10-F or any standard successor. FSS licensee notification to the affected FS licensee must be in writing and must provide the incumbent with no less than six months to vacate the spectrum. After the six-month notice period has expired, the FS licensee must relinquish its license to the Commission, unless it has entered into an agreement with the affected FSS licensee that allows it to continue to operate on a mutually agreed upon basis.