| 摘要 |
PURPOSE: A transmitter receiver for a collision protection of a tower crane is provided to use a single frequency, thereby transceiving varying channel which is different to each other of each tower crane in real time. CONSTITUTION: Only one set including a transmitter(A) and a receiver is included to one tower crane. An access signal is transmitted to other tower crane of a channel selected to transmitter switch of a transmitter(3). A receiver which received the access signal recognizes a number and acoustic corresponding to issue number of other tower crane which crossing the other. By using a single frequency, a varying channel is transceived by channel selection dip switch.
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