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Naval Historical Center
|Pulse Width||2 microseconds
|Pulse Repetition Frequency
|Power||5-50 kW depending on model
|Range||8 miles (13 km) for submarine
25 miles (40 km) for cruiser
60 miles (100 km) for coastline
Minimum range 350 yards (320 m)
||Two Yagi dipole arrays
||Modified 5" J scope
||10% in range
3 degrees in bearing
||26,000 from late 1942
ASB was an early airborne surface search radar developed for American carrier bombers and flying boats.
A similar radar was adopted by the Army as the SCR-521. It was a
general-purpose surface search radar capable of detecting coastlines for
navigation or surface ships for scouting and attack, and it had Identification Friend or Foe capability.
The set used two Yagi dipole array antennas, one below each wing.
Each antenna was individually turned to point in any direction from
straight ahead to perpendicular to the line of flight, so that the pair
of antennas could cover an arc of 180 degrees in front of the aircraft. The display scope was a split J scope, with each antenna displaying on its side of the scope. Operators
could compare the size of the pips on opposite sides of the scope as a
kind of lobe switching to improve bearing accuracy, although the display was far from ideal for this purpose.
Aircraft using this radar included the SBD, SO3C, TBF, SB2C, PBY, PBM, PB2Y, and PV. It became the most widely used airborne radar of the war.
ReferencesJucker (2002; accessed 2014-6-19)
The Pacific War Online Encyclopedia © 2014 by Kent G. Budge. Index
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