SAFETY OF LIFE AT SEA C141 



y (c) A reliable clock shall be securely mounted in such a position that the 

 entire dial can be easily observed from the radiotelephone operating position. 



(d) A reliable emergency light shall be provided, independent of the 

 system which supplies the normal lighting of the radiotelephone installation, 

 and permanently arranged so as to be capable of providing adequate illumina- 

 tion of the operating controls of the radiotelephone installation, of the C'ock 

 required by paragraph (c) of this Regulation and of the card of instructions 

 required by paragraph (/). 



(e) Where a source of energy consists of a battery or batteries, the radio- 

 telephone station shall be provided with a means of assessing the charge 

 condition. 



(/) A card of instructions giving a clear summary of the radiotelephone 

 distress procedure shall be displayed in full view of the radiotelephone 

 operating position. 



Regulation 15 



Radiotelephone Installations 



(a) The radiotelephone installation shall include a transmitter, a receiver 

 and a source of energy. 



{b) The transmitter shall be capable of transmitting on the radiotelephone 

 distress frequency and on at least one other frequency in the bands between 

 1,605 kc/s and 2,850 kc/s, using the class of emission assigned by the Radio 

 Regulations for these frequencies. In normal operation the transmitter shall 

 have a depth of modulation of at least 70 per cent, at peak intensity. 



(c) (i) In the case of cargo ships of 500 tons gross tonnage and lipwards 

 but less than 1,600 tons gross tonnage the transmitter shall have a minimum 

 normal range of 150 miles, i.e., it shall be capable of transmitting clearly 

 perceptible signals from ship to ship by day and under normal conditions 

 and circumstances over this range* (Clearly perceptible signals will normally 

 be received if the R.M.S. value of the field strength produced at the receiver 

 by the unmodulated carrier is at least 25 microvolts per metre): 



(ii) In the case of cargo ships of 300 tons gross tonnage and upwards 

 but less than 500 tons gross tonnage — 



for existing installations the transmitter shall have a minimum normal 

 range of at least 75 miles; 



for new installations the transmitter shall produce a power in the aerial 

 of at least 1 5 watts (unmodulated carrier). 



(d) The transmitter shall be fitted with a device for generating the radio- 

 telephone alarm signal by automatic means. The device shall be capable of 

 being taken out of operation at any time in order to permit the immediate 

 transmission of a distress message. The Administration may delay the 



* In the absence of field strength measurements, it may be assumed that this range will be 

 obtained by a power in the aerial of 15 watts unmodulated carrier) with an aerial efficiency 

 of 27 per cent. 



Ch. 4 



