Downlink r f frequency f dwn for transmission to earth frequency translation transponders are used for in both gso and ngso orbits the uplinks and downlinks are codependent meaning that any degradation introduced on the uplink will be transferred to the downlink affecting the total communications link. The uplink frequency range is also used for non satellite military communications mostly aviation which uses analog am and in asia mobile phone traffic which uses narrowband fm. 5925 mhz to 6425 mhz is uplink band where as 3700 to 4200 mhz is downlink band. 
				
			
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