C140 SAFETY OF LIFE AT SEA 



(d) The transmitter shall, if modulated emission is prescribed by the Radio 

 Regulations, have a depth of modulation of not less than 70 per cent, and in 

 the case of radiotelegraph emission have a note frequency between 450 and 

 1,350 cycles per second. 



(e) In addition to a key for manual transmissions, the transmitter shall 

 be fitted with an automatic keying device for the transmission of the radio- 

 telegraph alarm and distress signals. If the transmitter is capable of 

 transmitting on the radiotelephone distress frequency, it shall be fitted with 

 an automatic device, complying with the requirements of paragraph (e) 

 of Regulation 15 of this Chapter, for transmitting the radiotelephone alarm 

 signal. 



(/) The receiver shall be capable of receiving the radiotelegraph distress 

 frequency and the classes of emission assigned by the Radio Regulations for 

 that frequency. If the transmitter is capable of transmitting on the radio- 

 telephone distress frequency the receiver shall also be capable of receiving 

 that frequency and the class of emission assigned by the Radio Regulations 

 for that frequency. 



(g) The aerial shall be either self-supporting or capable of being supported 

 by the mast of a lifeboat at the maximum practicable height. In addition 

 it is desirable that an aerial supported by a kite or balloon shall be provided 

 if practicable. 



(h) The transmitter shall supply an adequate radio frequency power* to 

 the aerial required by paragraph (a) of this Regulation and shall preferably 

 derive its supply from a hand generator. If operated from a battery, the 

 battery shall comply with conditions laid down by the Administration to 

 ensure that it is of a durable type and is of adequate capacity. 



(/) At sea a radio officer or a radiotelephone operator, as appropriate, 

 shall at weekly intervals test the transmitter, using a suitable artificial aerial, 

 and shall bring the battery up to full charge if it is of a type which requires 

 charging. 



0) For the purpose of this Regulation, new equipment means equipment 

 supplied to a ship after the date of coming into force of the present 

 Convention. 



Regulation 14 



Radiotelephone Stations 



(a) The radiotelephone station shall be in the upper part of the ship and 

 so located that it is sheltered to the greatest possible extent from noise which 

 might impair the correct reception of messages and signals. 



(b) There shall be efficient communication between the radiotelephone 

 station and the bridge. 



♦ It may be assumed that the purposes of this Regulation will be satisfied by the following 

 performance. 



At least 10 watts input to the anode of the final stage or a radio-frequency output 

 of at least 2 watts (A2 emission) at 500 kc/s into an artificial aerial having an eflTective 

 resistance of 15 ohms and 100 x 10 '^ farads capacitance in series. The depth of 

 modulation shall be at least 70 per cent. 



Ch. 4 



