RA-1B Receiver and Direction Finding
1941

RA-1B receiver is a communication receiver designed for use in aircraft. It may be employed for the reception of continuous wave telegraph or radio telephone signals within frequency ranges of 0.15 to 1.5 mc and 1.8 to 15.0 mc. Free band are used to give full coverage in each frequency range. Aural direction finding and loop antenna  reception may be optained over a frequency range from 0.2 to 1.5 mc by using the receiver in conjunction with the Bendix direction finding equipment (DU-1).