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History and Background. More efficient use of Part 90 spectrumVHF (150 174 MHz)UHF (421-512 MHz) LicenseesReduce operations from 25 kHz channels to 12.5 kHz or lessJanuary 1, 2013FCC recommends migration to 6.25 kHz No date licensees must operate 6.25 kHzMFG's Prohibited from new 25 kHz
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