The test loop translator is a very useful way of simulating an end to end satellite circuit without having to use the satellite.
It's general knowledge that when you transmit to the satellite on a certain frequency the satellite does not respond in the same frequency otherwise conflicts occur. In KU band the satellite downshifts the uplink frequency by a factor of 2300MHz and returns it to the receiving antenna. This is the same thing that the test loop translator does in KU Band, and you don't need an antenna nor space segment.
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