downlink
The downlink of a satellite circuit is the
one in which the satellite is trans-
mitting the signal and the earth ...
Output back-off
Where input BO is employed, a corresponding output BO
must be allowed for in the satellite EIRP. Output BO...
Satellite TWTA output
The satellite power amplifier, which
usually is a TWTA, has to supply the
radiated power plus the tr...
Satellite Downlink
Source: Cryptome [Cryptome.org]
 When using a satellite for
long distance
communications, the
satellite acts as a
repeate...
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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
  4. 4. Satellite Downlink
  5. 5. Source: Cryptome [Cryptome.org]  When using a satellite for long distance communications, the satellite acts as a repeater.  An earth station transmits the signal up to the satellite (uplink), which in turn retransmits it to the receiving earth station (downlink).  Different frequencies are used for uplink/downlink. Satellite Communication

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