Radiotelephone auto alarm

(1) The radiotelephone auto alarm, where provided, shall comply with the following minimum requirements– (a) the frequency of maximum response of the tuned circuits, and other tone selecting device, shall be subject to a tolerance of ± 1. 5 % of the maximum response for frequency of maximum response; Merchant Ships (Registration) 212 (b) in the absence of noise and interference, the automatic receiving equipment shall be capable of operating from the alarm signal in a period of not less than 4 s and not more than 6 s.; (c) the automatic receiving equipment shall respond to the alarm signal under conditions of intermittent interference caused by atmospherics and powerful signals other than the alarm signals, preferably without any manual adjustment being required during any period of watch maintained by the equipment; (d) the automatic receiving equipment shall not be actuated by atmospherics or by strong signals other than the alarm signal; (e) the automatic receiving equipment shall be effective beyond the range at which speech transmission is satisfactory; (f) the automatic receiving equipment shall be capable of withstanding vibration, humidity, changes of temperature and vibrations in power supply voltage equivalent to the severe conditions experienced on board ships at sea, and shall continue to operate under such conditions; and (g) the automatic receiving equipment shall, as far as practicable, give warning of faults that would prevent the apparatus from performing its normal functions during watch hours.