| http://www.w3.org/ns/prov#value | - However the transceiver 34 could transmit on a frequency derived from the interrogating signal, for example a harmonic or sub-harmonic, or transmit on a frequency unrelated to that of the interrogating signal. [0018] A simple passive radio receiver 38, which may comprise a spiral antenna 40, is coupled to the microcontroller 20.
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