Sec. 80.805  Radio installations.

    (a) The main radiotelegraph installation includes a main 
transmitter, a main receiver, a main power supply, a main antenna system 
and a 2182 kHz radiotelephone distress frequency watch receiver.
    (b) The reserve radiotelegraph installation includes a reserve 
transmitter, a

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reserve receiver, a reserve power supply, emergency electric lights and 
reserve antenna system: except that:
    (1) In installations on cargo ships of 300 gross tons and upwards 
but less than 1,600 gross tons, and in installations on cargo ships of 
1,600 gross tons and upwards installed prior to November 19, 1952, if 
the main transmitter complies with all the requirements for the reserve 
transmitter, the latter may be omitted.
    (2) A cargo ship the keel of which was laid prior to June 1, 1954, 
may either be equipped with a reserve antenna or provided a spare 
antenna consisting of a single-wire transmitting antenna (including 
suitable insulators) completely assembled for immediate installation.
    (c) The medium frequency radiotelephone installation includes a 
radiotelephone transmitter, a radiotelephone receiver and an appropriate 
antenna system.