美国停止使用认证和使用频道间隔为25KHz的无线设备

    美国联邦通信委员会（FCC）在2010年12月宣称：“从2011年1月1号起停止认证和2013年1月1号起停止使用包括频道间隔为25KHz的V段（150MHz-174MHz）和U段（421MHz-512MHz） 专业陆地无线通信设备”。

    以下为FCC网站原文：
This Public Notice reminds interested parties of the Federal Communication Commission’s deadlines for private land mobile radio services in the 150-174 MHz and 421-512 MHz bands to migrate to narrowband (12.5 kHz or narrower) technology.

Licensees and frequency coordinators should be aware of the following deadlines:
(1) Beginning January 1, 2011, the Commission will no longer accept applications for:
-new wideband 25 kHz (i.e., operating with only one voice path per 25 kHz of spectrum) operations,

-modification of existing wideband 25 kHz stations that expand the authorized interference contour (19 dBu VHF, 21 dBu UHF); and

(2) By January 1, 2013, Industrial/Business and Public Safety Radio Pool licensees must:
-operate on 12.5 kHz (11.25 kHz occupied bandwidth) or narrower channels, or

-employ a technology that achieves the narrowband equivalent of one channel per 12.5 kHz of channel bandwidth for voice and transmission rates of at least 4800 bits per second per 6.25 kHz for data systems operating with bandwidths greater than 12.5 kHz.

Equipment manufacturers should be aware that, beginning January 1, 2011, the Commission will no longer certify 150-174 MHz or 421-512 MHz band equipment capable of operating with only one voice path per 25 kHz of spectrum. Providers may manufacture and import previously-certified equipment with a 25 kHz mode until January 1, 2013.

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