Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito "huff-duff") receivers

"huff-duff") receivers

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

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

This indicator provided a feedback loop to the crewman thus enabling him to ensure proper wing temperature

Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito "huff-duff") receiversHere 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