Sec. 80.251  Scope.

    (a) This subpart gives the general technical requirements for type 
acceptance of equipment used on compulsory ships. Such equipment 
includes radiotelegraph transmitters, radiotelegraph auto alarms, 
automatic-alarm-signal keying devices, survival craft radio equipment, 
watch receivers, and radar.

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    (b) The equipment described in this subpart must be type accepted.
    (c) The term transmitter means the transmitter unit and all 
auxiliary equipment necessary to make this unit operate as a main or 
emergency transmitter in a ship station at sea. Each separate motor-
generator, rectifier, or other unit required to convert the ship primary 
power to the phase, frequency, or voltage necessary to energize the 
transmitter unit is considered a component of the transmitter.
    (d) Average ship station antenna means an actual antenna installed 
on board ship having a capacitance of 750 picofarads and an effective 
resistance of 4 ohms at a frequency of 500 kHz, or an artificial antenna 
having the same electrical characteristics.