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Instrumentation Reference Book, 4th Edition by Walt Boyes

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43.8. Electronic and Avionic Systems

43.8.1. Radio Transmitters

Where the reliability of a radio link using diversity reception is a critical part of a control or instrumentation system it may be necessary to provide some degree of redundancy in the transmitting end of the link. The same procedure as used for any complex system can be adopted, that is, the division of the system into smaller assemblies, each of which can be replicated. The exact arrangement depends upon the type of transmitter and whether it can be maintained.
Generally, duplicate redundancy is adequate and in a maintained system both of the duplicate units may normally be active. When a fault appears, the faulty unit is disconnected, and a reduction in the quality of service ...

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