| http://www.w3.org/ns/prov#value | - In FIG. 2, designated at 10 is an antenna, 20 is a receiving circuit, 21 is a radio-frequency amplifier, 22 is a mixer, 23 is a local oscillator, 24 is an intermediate frequency amplifier, 25 is a limiter, 26 is a frequency modulation detector, 27 is an audio-frequency amplifier, 31 is an electric field strength detector, 32 is an A/D converter, 41 is a central processing circuit, 51 is a display,
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