Why is uplink frequency higher than downlink frequency and what’s swamping of signals?
In: Physics
Uplink frequency is kept higher than Downlink frequency for the following reasons:
* At higher frequency, the wave dies out faster, so more power is required to ensure that it reaches the destination. Higher power requirements involve the use of high power amplifiers with high ratings and heat sinks. For a satellite this will result in higher power consumption and more weighty equipment to launch into orbit, which is less than ideal.
* You also want to keep the beam directed towards only the target satellite with as little spill over as possible, i.e. the antenna must have high directivity (you want a sniper rifle, not a shotgun). Beam width is directly proportional to wavelength, so higher frequency means a skinnier wavelength, hence lower beam width, therefore greater directivity.
Swamping is when a signal is overwhelmed by other noise, so it can’t be picked out by the receiver. For example, you whispering to someone in a cheering football stadium (back when people could go to those).
I have one last question very sorry
How does the uplink frequency being higher help with prevention of swamping?
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