"Non Standard Pairs" for 450-470 FB8 Systems

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The FCC accepted the Land Mobile Communications Council's proposal to license "non-standard frequency pairs" in the 450-470 MHz band on 12.5 kHz channels.

The name is misleading. The pairs remain 5 MHz splits. Instead, this allows a 12.5 kHz center frequency with a 4K00 emission 3.125 kHz below it, and another 4K00 emission 3.125 kHz above it, effectively providing two 4K00 voicepaths with 6.25 kHz in between them within a 12.5 kHz channelspace. ULS can accommodate this, but it's not certain how.

This will only be allowed for trunked systems with FB8/MO8 exclusivity, and, per the FCC's DA 12-10 will not be allowed for conventional, T-Band, or 6.25 kHz offset frequencies. This will also not be allowed on VHF.

At this point in time, only NXDN systems can do this 4 kHz narrow bandwidth.

http://transition.fcc.gov/Daily_Releases/Daily_Business/2012/db0105/DA-12-10A1.pdf
 
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