| 摘要 |
A bidirectional transmission apparatus, such as an optical atmospheric link apparatus which sends information signals to and receives information signals from a communicating object using modulated light beams which propagate in the atmosphere. The invention enables the sending and receiving channel frequencies to be set simply and easily, to avoid interference between signals transmitted simultaneously over the sending and receiving channels. The apparatus of the invention includes a housing with slots. Each slot changeably accommodates a sending wiring board or a receiving wiring board. A control unit can set the operating frequency of each board at a particular frequency assigned to the slot in which the board is housed. The apparatus of the invention also includes an intercom circuit for communicating with the communicating object.
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