Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito The type of aircraft which

The type of aircraft which used this tachometer has not yet been identified by us

The A-9A regulator was a low pressure continuous flow regulator (vs the on-demand

The part number on the unit is not legible

black dial stopwatch under military specification no

(The prism has a small chip in its lower left corner)

Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito The type of aircraft whichHere 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