Interference scenario assumptions Frequency: 605 MHz – Transmitter: 1 MW ERP, 6 MHz BW, antenna height – Transmitter location: 38° 57′ 22″ N 77° 4′ 59″ W AMSL – Receiver: antenna height – Receiver location: 38° 25′ 59.2″ N 79° 50′ 23.4″ W AMSL – Received in 0 dBi side lobe of radio telescope – Required percentage: 2% of the time – 6.6 Recommendation ITU-R P.1812 sample sharing scenario Sharing/RFI scenario of fixed earth station from mobile AWS station Background There was great concern about interference from advanced wireless services (AWS) operations into a federal fixed earth station in the 1 710-1 755 MHz band. The Federal Communication Commission (FCC) AWS auction rules permit its AWS licensees to begin to implement service during the transition period allocated for Federal Government operations provided they do not cause harmful interference into the federal earth stations. In mitigation for interference, coordination zones and operational contours were needed to be created around affected federal earth stations. Reasons for selection of Recommendation ITU-R P.1812 Recommendation ITU-R P.1812 was chosen for this scenario because both the transmitter and receiver terminal locations are known, terrain data between these two terminals can be found, and the terminal height requirement fits the parameters of Recommendation ITU-R P.1812. Coordination scenario assumptions Frequency range 1 710-1 755 MHz Earth station Rx parameters Parameter Location 29.56N, 95.09W Frequency 1741.0 MHz Bandwidth 12 MHz HAAT 6 m Rx antenna gain 34 dBi Rx antenna diameter --- System noise temperature 300 K Antenna +5 dB Rx noise figure RFI criteria (at antenna flange) dBm –109.0 (~10 dB below noise)
Interference scenario assumptions – Frequency: 605 MHz – Transmitter: 1 MW ERP, 6 MHz BW, antenna height – Transmitter location: 38° 57′ 22″ N 77° 4′ 59″ W AMSL – Receiver: antenna height – Receiver location: 38° 25′ 59.2″ N 79° 50′ 23.4″ W AMSL – Received in 0 dBi side lobe of radio telescope – Required percentage: 2% of the time 6.6 Recommendation ITU-R P.1812 sample sharing scenario Sharing/RFI scenario of fixed earth station from mobile AWS station Background There was great concern about interference from advanced wireless services (AWS) operations into a federal fixed earth station in the 1 710-1 755 MHz band. The Federal Communication Commission (FCC) AWS auction rules permit its AWS licensees to begin to implement service during the transition period allocated for Federal Government operations provided they do not cause harmful interference into the federal earth stations. In mitigation for interference, coordination zones and operational contours were needed to be created around affected federal earth stations. Reasons for selection of Recommendation ITU-R P.1812 Recommendation ITU-R P.1812 was chosen for this scenario because both the transmitter and receiver terminal locations are known, terrain data between these two terminals can be found, and the terminal height requirement fits the parameters of Recommendation ITU-R P.1812. Coordination scenario assumptions Frequency range 1 710-1 755 MHz Earth station Rx parameters Parameter Location 29.56N, 95.09W Frequency 1741.0 MHz Bandwidth 12 MHz HAAT 6 m Rx antenna gain 34 dBi Rx antenna diameter --- System noise temperature 300 K Antenna +5 dB Rx noise figure RFI criteria (at antenna flange) –109.0 dBm (~10 dB below noise)