1 INTERFERENCE ASSESSMENT AND DEVELOPMENT OF INTERFERENCE PROTECTION
- Slides: 6
1 INTERFERENCE ASSESSMENT AND DEVELOPMENT OF INTERFERENCE PROTECTION CRITERIA TO PROTECT PUBLIC SAFETY OPERATIONS AND ENABLE SPECTRUM SHARING WITH NTSC AND DTV BROADCASTING IN TV CHANNELS 60 -69 (746 -806 MHz) Work carried out by: Garry Rolston P. Eng. 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 Fax: 613 -238 -1734 E-Mail: lapp-han@lapp-hancock. ca
2 NTSC MASK 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 Fax: 613 -238 -1734 E-Mail: lapp-han@lapp-hancock. ca
3 DTV MASK 0 DTV average power 0 d. B 11 d. B 10 20 30 35 d. B 40 50 d. B RES BW 500 k. Hz 60 70 80 FCC mask Canadian relaxed mask Canadian tight mask 90 100 110 0 1 2 3 4 5 6 Frequency (MHz) 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 Fax: 613 -238 -1734 E-Mail: lapp-han@lapp-hancock. ca
4 CO-CHANNEL SHARING DIGITAL TELEVISION Interfering Television Station Land Mobile Base Stn Class ERP Rel. Antenna Required Separation to 1 KW EHAAT Distance VL 250 k. W 24 d. B 300 m 264 km C 15 k. W 11. 76 d. B 300 m 192 km NTSC TELEVISION Required Separation Distance to Base Stations (Class C 1 MW ERP, 300 m EHAAT) Vision carrier ± 0. 5 MHz Protection ratio 0 d. B Required 370 km separation Sound carrier Colour sub-carrier All other ± 0. 2 MHz ± 0. 5 MHz frequencies 10 d. B 305 km 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 20 d. B 245 km Fax: 613 -238 -1734 30 d. B 185 km E-Mail: lapp-han@lapp-hancock. ca
5 ADJACENT CHANNEL SHARING NTSC TELEVISION See BPR Part IV, Appendix 12 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 Fax: 613 -238 -1734 E-Mail: lapp-han@lapp-hancock. ca
6 RECOMMENDATIONS • It is recommended that no provision be made for cochannel protection in the domestic rules. • It is recommended that co-location of base stations with TV transmitters be considered in cities having channel 62 or 64 allotments, in order to minimize the potential of interference to either land mobile (mobile stations) or TV reception. • The mandatory use of the FCC tight mask is recommended. 280 Albert Street, Suite 900 Ottawa, Ontario K 1 P 5 G 8 Tel: 613 -238 -2483 Fax: 613 -238 -1734 E-Mail: lapp-han@lapp-hancock. ca
