Control Unit, C-149/ARN-6 Radio Compass System B-36 It has a serial #

It has a serial # prefix of AF49

but the stamped service date is illegible

likely indicating a manufacturing year of 1950

The instrument is in exceptional but experienced condition given its age

in an audio frequency signal the average frequency of which is proportional to the altitude of the aircraft above the ground

Control Unit, C-149/ARN-6 Radio Compass System B-36 It has a serial #This is a terrific example of a C 149 Control unit for the aircraft receiver R 101 of the Radio Compass AN ARN 6 system for direction finding and homing. The receiver function tunes from 100 1750 kHz across 4 bands, which were selected by rotating the center knob below the frequency band window. The center knob rotates a flexible shaft connected to a rotatable loop antenna. The AN ARN 6 system evolved over time, originally using a control box similar