GMDSS普通操作员 第12讲：Passage 34 第12讲：Passage 34.ppt

航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 Passage 34 ① Coast stations which use 2,182 kHz for calling shall be able to use at least one other frequency in the authorized bands between 1,605 kHz and 2,850 kHz. ② Coast stations authorized to use radiotelephony on one or more frequencies other than 2,182 kHz in the authorized bands between 1,605 kHz and 2,850 kHz shall use class J3E emissions on those frequencies. ③ Coast stations open to the public correspondence service on one or more frequencies between 1,605 kHz and 2,850 kHz shall also be capable of transmitting class H3E and J3E emissions with a carrier frequency of 2,182 kHz, and of receiving class A3E, H3E and J3E emissions with a carrier frequency of 2,182 kHz. Passage 34 ④ One of the frequencies which coast stations are required to be able to use is printed in heavy type in the List of Coast Stations to indicate that it is the normal working frequency of the stations. Supplementary frequencies, if assigned, are shown in ordinary type. ⑤ Working frequencies of coast stations shall be chosen in such a manner as to avoid interference with other stations. Passage 34 1. Why shall coast stations be capable of working on at least one other frequency in the authorized bands between 1,605 kHz and 2,850 kHz? A. The main purpose of 2,182 kHz is distress and safety communications. B. This frequency is always congested. C. The number of working frequency in bands between l,605 kHz and 2,850 kHz is the more the better. D. In order to control the output power effectively. 正确答案：A Passage 34 2. What classification of modulation should be selected by coast stations when they work on one or more frequencies other than 2,182 kHz in the bands between l,605 kHz and 2,850 kHz? A. G3E. B. J3E. C. J2B. D. A2A. 正确答案：B Passage 34 3. What capabilities should have when coast stations provide ships with the public co