| http://www.w3.org/ns/prov#value | - The transceivers 20, 21 and 22 comprise receive and transmit circuitry, including mixers, modulators, demodulators, analog-to-digital converters, and digital-to-analog converters so that the transceivers can transmit digital signals generated by processing means 24 and can provide digital signals to the processing means 24.
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