This page refers to a Ku band satellite new gathering vehicle (DSNG) uplink sending back video to the hub studio site.
The satellite receive uplink G/T is +5 dB/K
Uplink SFD = -90 dBW/m^2 single carrier. Note 4 dB input back off
Uplink PFD = - 90 - 4 multi carrier
Uplink PFD = -90 - 4 - 10log(1.5/36) for your uplink carrier
Uplink PFD = -107.8 dBW/m^2 for your uplink carrier
Occupied bandwidth is 1.4 MHz. Noise bandwidth ofcarrier assumed to be 1/1.2 of this.
So vabdwidth for C/N calvulation = 1.4 MHz /1.2 = 1166666 Hz.
Assuming transponders are 36 MHz wide, with EIRP=51.5 dBW saturated single carrier.
Assuming multicarrier output back off = -2 dB.
EIRP per 1.5 MHz (multicarrier operation) = 51.5 - 2 - 10log(1.5/36) = 35.7 dBW
The transponder 'gain' factor of 143.5 has been adjusted to give +35.7 dBW downlink EIRP for input PFD=-107.8 dBW.
The input figures are adjustable. You need to overwrite the figures with your own more accurate information and assumptions.
Amend any white boxes and then click the calculate button to obtain results in the green boxes.
Any problems or comments please e-mail Eric Johnston
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