In today’s mission-critical satellite communications, a ground system is often judged less by its peak performance than by how rarely it stops working. Every signal that reaches a demodulator, and every carrier that leaves for the satellite, passes through a series of active RF components—each of which can fail and take the link down with it.

This paper sets out why availability is the governing metric in satellite communications, why duplicating a critical function is more effective than simply specifying a more reliable part, and what operators should look for when specifying redundancy for the RF front end.

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