FCC Grants Denver Request to Modify 800 MHz System
Wednesday, October 13, 2021 | Comments

The FCC granted a request from the city and county of Denver to modify its 800 MHz trunked station.

The 50-channel, two-site 800 MHz system is currently authorized to be short spaced to co-channel licensee Iota Spectrum Partners. The city and county operates its first site at 600 W, which is the maximum effective radio power (ERP) for the relevant height above average terrain (HAAT).

Denver asked to modify its authorization by raising its antenna 6.5 meters at the first site while maintaining the same ERP. The FCC rules allow such a change as long as the modification does not extend the station’s 22 dBu contour beyond its maximum contour in the direction of the short-spaced station.

In its request, Denver noted the proposed modifications would extend the station’s 22 dBu contour towards the Iota station but argued that the increase would be minimal and the new 22 dBu interference contour would not overlap Iota’s 40 dBu service contour. The city and county submitted an engineering study to support that.

Denver did not submit a letter of concurrence from Iota but argued that a letter of concurrence is only needed if the other station is constructed. The city and county said it is not sure if Iota has constructed the site but said it did provide a copy of its waiver request to the company.

The FCC granted the request noting that the engineering analysis confirmed that the proposed modification would not go against its rules meant to protect licensees from interference.

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