A movable repeater station interposed between a radio movable working machine, which is capable of movably working in a working site by radio control, and a remote control apparatus, which operates said radio movable working machine by radio control, for repeating a signal, comprising:
- a first high radio wave directionality bidirectional transmission/reception section for performing bidirectional communication having a high radio wave directionality for enabling bi-directional communication between a working-machine-side antenna equipped to said radio movable working machine and a first repeater-station-side antenna equipped to said movable repeater station;
- a first automatic tracking apparatus for controlling orientation of said working-machine-side antenna and orientation of said first repeater-station-side antenna in an automatic way, so that said working-machine-side antenna and said first repeater-station-side antenna follow movement of each other;
- a second high radio wave directionality bidirectional transmission/reception section, for performing bidirectional communication between a control-apparatus-side antenna equipped to said remote control apparatus and a second repeater-station-side antenna equipped to said movable repeater station;
- a response section for responding to an automatic tracking signal from a second automatic tracking apparatus provided on said remote control apparatus, where the second automatic tracking apparatus controls orientation of said control-apparatus-side antenna and orientation of said second repeater-station-side antenna automatically, so that said control-apparatus-side antenna and said second repeater-station-side antenna follow movement of each other;
- and
- an emergency spread spectrum bidirectional transmission/reception section for enabling bidirectional communication with said remote control apparatus when communication by said second high radio wave directionality bidirectional transmission/reception section is impossible.