Control Unit C-4, of ARN-7 Automatic Radio Compass, for Parts or Repair F7F Tigercat operates in the same manner

operates in the same manner but has greater air volume capacity for larger aircraft with more air-driven instruments such as a heavy bomber or transport

We believe it to be a pre-WWII model for civil aircraft

Here are 6 spare Gyro Caging Knob Mechanisms for the Artificial Gyro Horizon

likely made for a USAF aircraft order in 1952

The VOR-102 was used in a variety of aircraft during this era

Control Unit C-4, of ARN-7 Automatic Radio Compass, for Parts or Repair F7F Tigercat operates in the same mannerHere 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