Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Nick Fighter dated 1953

dated 1953

The indicator measures ~3

(glass broken)

and emergency conditions

Included is a Center of Gravity Computer dated 1942

Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Nick Fighter dated 1953Here is a WWII era Control Unit for the ARN 7 Automatic Radio Compass system used 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 ARN 7 system (see diagram), were one of several generations of radio navigational systems installed in an