The Pacific War Online Encyclopedia
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||375 to 750 cm
|Range||Up to 400 miles (640 km)
||Separate transmitter and
The Type A Detector System was a very primitive form of radio detection that was nonetheless widely deployed in the inner Japanese Empire. It consisted of separate transmitter and receiver antennas many miles apart, with the transmitter sending a continuous wave signal. Aircraft flying between the transmitter and receiver created an interference pattern on the receiver scope, but there was no information on precise bearing, altitude, or number of aircraft. It was thus nothing more than an electronic tripwire that could be laid across possible aircraft approach routes.
The antennas were typically placed up to 100 miles (160 km)
apart, but one pair covered the 400 miles (640 km) between Shanghai and Formosa.
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