Users in the VHF and UHF bands (below 512 MHz) face a mandatory FCC narrowbanding deadline of Jan. 1, 2013. Narrowbanding is a spectrum-efficiency requirement that initially requires the equivalent of at least one user per 12.5 kHz for voice channels or capacity of at least 9.6 kbps per 12.5 kHz for data channels. The FCC intends to further squeeze VHF and UHF land mobile radio channels to 6.25 kHz (or equivalent), but no formal deadline has been established for this second phase. However, ...

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