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不久以前,英国制出了第一台用无线电操纵的拖拉机,它是由不大的无线电装置和27.12千周的电池式发射机在远处操纵的。发射机的6种不同的信号可以沿6条讯路作用于继电器,再通过第二继
Not long ago, Britain produced the first radio-operated tractor, which was operated remotely by a modest radio and a 27.12-kilometre battery transmitter. The six different signals of the transmitter can act on the relay along the six lines and then the second one.