Tips and Tricks on Principles of Communication


 


1
Modulation is required for long distance communications. Modulation is of two type, Analog and digital. A analog modulation is further of two types amplitude modulation (AM) and angle modulation is of two types.



2
In satellite communications uplink and downlink frequencies differ. Downlink frequency being slightly higher.



   3
Duct super refraction of microwaves occur due to temperature inversion zones present in space. For UHF rays troposcatter of forward scatter propagation occurs. Frequency range is 900 to 5000 M Hz for UHF


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