Merchant Shipping Act, 1951 (Act No. 57 of 1951)RegulationsMerchant Shipping (Radio Installations) Regulations, 2002Part 3 : Non-GMDSS Requirements33. Range of radiotelephone transmitter |
| (1) | The normal range of the radiotelephone transmitter required by this Part must not be less than 150 nautical miles on the frequency 2182 kHz. The range is normally to be determined by calculation of the metre-amperes (which is the product of the maximum height of the antenna in metres, measured from the lead-out insulator, and the current in amperes, measured at the base of the antenna), but if an antenna arrangement causes difficulty in determining the range of a transmitter by calculation, it must be determined by trial. |
| (2) | A radiotelephone transmitter is to be taken to comply with subregulation (1) if the product calculated in accordance with that subregulation is not less than— |
| (a) | 7.5 metre-amperes, in the case of an antenna having a horizontal top-length of not less than 50 per cent of its maximum height, measured from the lead-out insulator; or |
| (b) | 12.8 metre-amperes, in the case of any other antenna. |
| (3) | The radiotelephone transmitter must have a minimum rated output power of not less than 100 watts peak envelope power, measured between the transmitter final stage and the antenna tuning unit. |