Transmitters designed after August 11, 2014 to operate on the narrowband interoperability achannels in the 769–775 and 799–805 MHz band (see §90.531) shall conform to the following technical standards (transmitters certified prior to this date are grandfathered).
CFR 47-90.548-2014由US-CFR-file 发布于 2014-07-10,并于 2014-07-10 实施。
CFR 47-90.548-2014 在中国标准分类中归属于: M01 技术管理。
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