Radio Compass Indicator I-81-A of SCR-269-G and AN/ARN-7 Bf-109 The center knob rotates a

The center knob rotates a flexible shaft connected to a rotatable loop antenna

such as the P-38 Lightning

an exceptional example indeed

Used for sighting 3"/50 guns

Radio Compass Indicator I-81-A of SCR-269-G and AN/ARN-7 Bf-109 The center knob rotates aThe I 81 A Radio Compass Indicator (aka Pilot's Bearing Indicator) is a component of the Radio Compass SCR 269 G system (which evolved into the AN ARN 7), used during WWII. According to the Airborne Radio Equipment Handbook of the Air Service Command dated 1943, this system appeared in versions of the US Army Air Force bombers B 17, B 24, B 25, B 26, B 29, and transports C 46, C 47, and C 54, as well as in any models of these aircraft used by the US