# 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
> **Federal Communications Commission** · Final rule. · Published 2007-04-18 · Effective 2007-05-18 · 72 FR 19387
## Document
- **Document number:** E7-7252
- **Category:** spectrum-allocation
- **Federal Register citation:** 72 FR 19387
- **CFR reference:** 47 CFR 90
- **Publication date:** 2007-04-18
- **Effective date:** 2007-05-18
- **FCC docket:** WT Docket No. 99-87
## Abstract

In this document, the Federal Communications Commission (Commission or FCC) declines, for now, to establish a schedule for Private Land Mobile Radio (PLMR) systems in the 150-174 MHz and 421-512 MHz bands to transition to 6.25 kHz technology; and revises the implementation date of the 6.25 kHz requirement for equipment certification from January 1, 2005 to January 1, 2011.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/04/18/E7-7252/implementation-of-sections-309j-and-337-of-the-communications-act-of-1934-as-amended-promotion-of)
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