Implementation of Sections 309(j) and 337 of the Communications Act of 1934 as Amended; Promotion of Spectrum Efficient Technologies on Certain Part 90 Frequencies

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In the Fourth Memorandum Opinion and Order in WT Docket No. 99-87 (Fourth Memorandum Opinion and Order), the Federal Communications Commission (Commission or FCC) clarifies the Commission's Third Report and Order in this docket, and takes the opportunity to correct the inadvertent deletion of language in the rules regarding the schedule for Private Land Mobile Radio systems in the 150-174 MHz and 421-512 MHz bands to transition to narrowband kHz technology.