02.18.2005 08:00 AM
SBE tells commission to protect ENG RO sites from AWS OOBE

The Society of Broadcast Engineers last week told the Federal Communications Commission that comments from commercial mobile radio service (CMRS) operators seeking to use the 2GHz band for advanced wireless service (AWS) have failed to recognize the threat their out-of-band emissions (OOBE) pose to ENG operation.

The society made the assertion in reply comments filed Feb. 8 with the commission regarding its Notice of Proposed Rulemaking relating to service rules for AWS stations in the 2GHz band.

The SBE filing acknowledged that comments from CMRS entities concluded that stricter OOBE limits were required to avoid CMRS-to-CMRS adjacent channel/adjacent-band operations, but they did not address the threat of OOBE to “highly sensitive 1025-1110MHz TV broadcast auxiliary service users.”

The SBE told the commission that requiring AWS CMRS base stations to suppress their OOBE by at least 67 + 10log P decibels is imperative and that no such station be allowed within 0.5km of an ENG receive-only site without being required to install additional filtering to assure that the noise floor of the receiver at the ENG RO site is degraded by no more than 0.5dB.

The society also told the commission that authorizing such a site should be conditioned on showing that the receive-only site is properly protected. The comments once again called on the FCC to modify the ULS to allow TV Pickup licenses to document positions and heights of ENG RO sites.

For more information, visit www.sbe.org.

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