| 摘要 |
The CCIR,
CONSIDERING
(a) that Resolution No. 308 of the World Administrative Radio Conference, Geneva, 1979, stipulates that:
?C the channel spacing for maritime mobile VHF radiotelephone services is being reduced from 50 kHz to 25 kHz;
?C the technical characteristics of equipment for 25 kHz channel spacing in these services shall be in accordance with Appendix 19 to the Radio Regulations, and that all equipment shall conform to 25 kHz standards by 1 January 1983;
(b) that it is desirable to supplement the list of technical characteristics given in Appendix 19 to the Radio Regulations in the interests of reduction of interference and of compatibility between equipments;
(c) that Appendix 18 to the Radio Regulations gives a table of transmitting frequencies which is based upon the principle of 25 kHz channel separations for the maritime mobile service;
(d) that many administrations have already prepared their national specifications for this type of equipment and consequently it is not possible at the present time to reach international agreement on the detailed specification and measurement of some equipment characteristics;
(e) that in Opinion 42, the IEC has been invited to advise the CCIR of any methods of measurement applicable to radio equipment used in land mobile services; and that such methods of measurement may also be suitable for radio equipment used in maritime mobile services |
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