This is a virtually complete SCR-718 radar altimeter, below some information from period documentation:
DESCRIPTION:Absolute pulse radar altimeter.
USES:For measuring absolute altitude in high-altitude bombing, photographic mapping, terrain clearance.
PERFORMANCE:SCR-718 operates between 50 ft. and 40,000 ft. Accuracy is ± 50 ft. plus 1/4%.
TRANSPORTABILITY:SCR-718 is crated in one unit weighing about 60 lbs., and occupying about 12 cu. ft.
INSTALLATION:SCR-718 weighs 40 lbs. installed and is mechanically and electrically interchangeable with AN/APN-1 except for indicator and AC power connection.
PERSONNEL:Altimeter is operated by pilot and can be serviced by regular radar maintenance personnel.
POWER:135 watts, 115 volts, 400-2600 cycles AC.
The altimeter is in good condition and virtually complete. As far as I can tell only the connnection cable between the transceiver and display units is missing. These use standard 7-pin Amphenol plugs which can be found relatively easily online.
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