| 摘要 |
a transmitter(9) and a receiver(14), a decoder(20) identifying the received specific number, and a driver(29) controlling switches(21-28). The transmitter includes a dip switch(17) selecting the specific number, an encoder(3) generating the specific number and a function code, an oscillator(4) oscillating carrier frequency, a mixer(5) mixing outputs of encoder and oscillator to generate modulated wave, an amplifier(7) amplifying output of mixer passing through a filter(6), and an antenna. The receiver includes an antenna(10), an amplifier(11), a filter(12), a local oscillator(13), a mixer(31), and an amplifier(30).
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