LMCC Amends Frequency Selection Procedures for T-Band
Monday, June 14, 2021 | Comments

The Land Mobile Communications Council (LMCC) and the wireless industry’s FCC-certified business/industrial and public-safety advisory committees adopted an addendum to the LMCC’s frequency selection procedures for the T-band.

The new amendment updates 1997 analytical procedures to accommodate both the deployment of new narrowband technologies and to mitigate the potential for interference to incumbent operations.

“Since 1997, a number of new narrowband technologies have been developed having 4, 6 kHz or 7.6 kHz bandwidths,” the amendment said. “Such technologies can be licensed on the original 25 kHz channels, on the 12.5 kHz offset channels, or on channels offset both by 6.25 kHz. These new technologies require an update to the procedures adopted in 1997.”

Under the 1997 agreement, 12.5 kilohertz offset stations were permitted to cause 5% interference to incumbent, non-offset 25 kilohertz stations.

“This is essentially the amount of interference that would be produced by a new co-channel station on an original channel center, at 64 kilometers away, as permitted in the FCC rules and regulations,” the addendum said.

The new amendment extends that procedure to applications for new stations and modification of existing stations on all T-band channels, where they propose operating on 25, 12.5 or 6.25 kilohertz channels, if there is spectral overlap between the proposed and adjacent incumbent station.

Find the full amendment here.

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