43.—(1) The main and reserve transmitter shall, when connected to the main antenna, have a minimum normal range as specified in the Table below, that is to say, they must be capable of transmitting clearly perceptible signals from ship to ship by day and under normal conditions and circumstances over the ranges there specified—
| Minimum normal range in miles | ||
|---|---|---|
| Main transmitter | Reserve transmitter | |
| All passenger ships, and cargo ships of 1,600 tons and upwards | 150 | 100 |
| Cargo ships below 1,600 tons | 100 | 75 |
(2) The range of a radiotelegraph transmitter for the purposes of this Part shall normally be determined by calculation of the metre-amperes. Where an antenna arrangement causes difficulty in determining the range of a transmitter by calculation, the range shall be determined by test.