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i got a task to design the ground station antenna. I need atleast to figure out G/T of the station. I looked at different link budget analysis, but could not find out how to calclate G/T of the antenna, or atleast how to assume this value. Usually G/T is given, but i got inverse task - to find G/T when everything else (well, almost everything) is provided. Satellite and channel parameters are given below:

Orbital altitude: 36 000 km

Inclination, Position: 0º, 30 º W

DL frequency: 20 GHz

UL frequency: 30 GHz

Polarization: UL: RHCP , DL: LHCP

Bandwidth, 3 channels: 143 MHz each

Modulation: QPSK

Minimum satellite EIRP: 54 dBW

Minimum SFD from satellite at ground stations: -100 dBW/m2

Maximum SFD from satellite at ground stations: -80 dBW/m2

Minimum satellite G/T: 6.7 dB/K

Can someone give a hint?

Thanks,

spacedude25

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# How to find G/T of antenna if everything else is provided - Link budget

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