|Limits On Satellite Emissions
In bands shared with terrestrial services satellite emissions are constrained to a power
flux density at the surface of the Earth which may not be exceeded. This is defined in a
measurement bandwidth and elevation angle dependant - higher limits at higher elevation angles
because terrestrial fixed stations have higher gain at lower elevation angles. Limits are
mandatory and are in S21 of the Radio Regulations.
Limits On Terrestrial Station Emissions
S21 sets mandatory limits for terrestrial stations. The EIRP limited to 55 dBW. Power to
the antenna input also limited to 13 dBW below 10 GHz and 10 dBW above 10 GHz.
The transmit beam is to be directed away from the GSO in the following way:
- 1 - 10 GHz: 2º from the GSO unless EIRP less than 35 dBW
- 10 - 15 GHz: 1.5 º from the GSO unless EIRP less than 45 dBW