(a) Licensees authorized to operate wireless services in the 600 MHz band must cause no harmful interference to public reception of the signals of broadcast television stations transmitting co-channel or on an adjacent channel.

(1) Such wireless operations must comply with the D/U ratios in Table 5 in OET Bulletin No. 74, Methodology for Predicting Inter-Service Interference to Broadcast Television from Mobile Wireless Broadband Services in the UHF Band ([DATE]) (“OET Bulletin No. 74”). Copies of this document are available on the FCC's website. See https://www.fcc.gov/general/oet-bulletins-line.

(2) If a 600 MHz band licensee causes harmful interference within the noise-limited contour or protected contour of a broadcast television station that is operating co-channel or on an adjacent channel, the 600 MHz band licensee must eliminate the harmful interference.

(b) A licensee authorized to operate wireless services in the 600 MHz downlink band:

(1) Is not permitted to deploy wireless base stations within the noise-limited contour or protected contour of a broadcast television station licensed on a co-channel or adjacent channel in the 600 MHz downlink band;

(2) Is required to perform an interference study using the methodology in OET Bulletin No. 74 before deploying or operating wireless base stations within the culling distances specified in Tables 7-12 of OET Bulletin No. 74 from the noise-limited contour or protected contour of such a broadcast television station;

(3) Is required to perform an interference study using the methodology in OET Bulletin No. 74 when modifying a base station within the culling distances in Tables 7-12 of OET Bulletin 74 that results in an increase in energy in the direction of co-channel or adjacent channel broadcast television station's contours;

(4) Is required to maintain records of the latest OET Bulletin No. 74 study for each base station and make them available for inspection to the Commission and, upon a claim of harmful interference, to the requesting broadcasting television station.

(c) A licensee authorized to operate wireless services in the 600 MHz uplink band must limit its service area so that mobile and portable devices do not transmit:

(1) Co-channel or adjacent channel to a broadcast television station within that station's noise-limited contour or protected contour;

(2) Co-channel to a broadcast television station within five kilometers of that station's noise-limited contour or protected contour; and

(3) Adjacent channel to a broadcast television station within 500 meters of that station's noise-limited contour or protected contour.

(d) For purposes of this section, the following definitions apply:

(1) Broadcast television station is defined pursuant to §73.3700(a)(1) of this chapter;

(2) Noise-limited contour is defined to be the full power station's noise-limited contour pursuant to §73.622(e);

(3) Protected contour is defined to be a Class A television station's protected contour as specified in section 73.6010;

(4) Co-channel operations in the 600 MHz band are defined as operations of broadcast television stations and wireless services where their assigned channels or frequencies spectrally overlap;

(5) Adjacent channel operations are defined as operations of broadcast television stations and wireless services where their assigned channels or frequencies spectrally abut each other or are separated by up to 5 MHz.

[80 FR 71743, Nov. 17, 2015, as amended at 85 FR 64407, Oct. 13, 2020]