# Consultation on Repurposing the 600 MHz Band — Annex C

Planning Parameters and Technical Assumptions
Parameter Value
Spherical earth distance 111.15 km/° latitude
Earth ground and atmospheric constants r=15, Θ=5 mS/m
Climatic zone Continental temperate (5)
Terrain database CDED 1"
Calculation of depression angles from TX Spherical earth geometry using elevations AMSL
Rounding of population centroids None
Terrain extraction interval 0.1 km for average terrain
1.0 km for path loss
DTV NLBC threshold (Low VHF, High VHF, UHF) 28, 36, 41 -20 log(615/frequency in MHz) dBu
DTV NLBC statistic (location/situation, time) 50, 90 percent
DTV-into-DTV interference threshold, co-channel 15+10 log [1/(1-10^(-x/10)], where x=S/N-15.19
DTV interference statistic (location/situation, time) 50, 10 percent
Cell size for Longley-Rice calculations Square, 2 km/side
Treatment of kwx=3 warnings Accept, Assume Coverage
NTSC TV station to DTV station conversion method Using IC F-curve program, match the resulting DTV station's F(90,90) contour distance* to the NTSC TV station's grade B contour distance, up to the maximum F(90,90) contour distance derived by the NTSC station's associated DTV parameters given in the current DTV Plan
TX antenna elevation pattern shape Standard OET 69, non-symmetrical
Electrical beam tilt As specified, or 0.75° if not specified for Canada stations and allotments
Mechanical beam tilt 0  (ignored)
Replication method for antenna horizontal patterns Scaled ERP (subject to maximum power limits as agreed) at new channel to match area enclosed, using existing antenna pattern
# radials used for height above the average terrain (HAAT) calculation 8
# radials used for contour projection 360
Minimum HAAT for any radial 30.5 m
Receive antenna height above ground level (AGL) 10 m
Receive antenna gain (low VHF, high VHF, UHF) 4, 6, 10 dBd
Downlead loss (low VHF, high VHF, UHF) 1, 2, 4 dB
Receive antenna front-to-back ratio (low VHF, high VHF, UHF) and azimuth pattern shape 10, 12, 14 dB,  cos4 (Θ), but not less than F/B ratio specified
Polarization Horizontal
Technical parameters of the station As-built operating

*F(90,90) contour distance is calculated as the distance to the NLBC signal strength threshold by using F(90,90) curves.

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