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# Ppt on downlink by prince kumar kushwaha (RJIT)

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The downlink of a satellite circuit is the one in which the satellite is trans- mitting the signal and the earth station is receiving it.
The free space and other losses are calculated for the downlink frequency.

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### Ppt on downlink by prince kumar kushwaha (RJIT)

1. 1. downlink The downlink of a satellite circuit is the one in which the satellite is trans- mitting the signal and the earth station is receiving it. The free space and other losses are calculated for the downlink frequency.
2. 2. Output back-off Where input BO is employed, a corresponding output BO must be allowed for in the satellite EIRP. Output BO is not linearly related to input BO. A rule of thumb, frequently used, is to take the output BO as the point on the curve which is 5 dB below the extrapolated linear portion. Since the linear portion gives a 1:1 change in decibels, the relationship between input and output BO. For the uplink, the saturation flux density at the satellite receiver is a specified quantity. For the downlink, there is no need to know the sat- uration flux density at the earth- station receiver, since this is a termi- nal point, and the signal is not used to saturate a power amplifier.
3. 3. Satellite TWTA output The satellite power amplifier, which usually is a TWTA, has to supply the radiated power plus the transmit feeder losses. These losses include the waveguide, filter, and coupler losses between the TWTAoutput and Quantity Decilogs