What is a Test Loop Translator?

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Editorial Team - everything RF

Apr 5, 2019

A Test Loop Translator (TLT) is a device used to evaluate the performance of satellite earth systems. The earth station transmits a signal to the TLT (instead of a satellite), the TLT, then converts this signal into an equivalent downlink signal that the Satellite would send back to the earth station.

Using a Test Loop Translator, users at a satellite earth station can carry out various tests and evaluate system performance without connecting to a real satellite. Connecting to a real satellite can be very expensive and can cause interference with other satellite users. This is why a TLT is an important requirement when developing, testing and evaluating SATCOM systems.

A basic version of the device consists of a mixer and a local oscillator. More advanced versions, allow the signal level, frequency bands and other parameters to be controlled for various scenarios.