Tuning Unit, MC-125 for Receiving and Transmitting Command Set SCR-AJ(and AL)-183 Douglas In such compasses

In such compasses

type T-203

with a maximum airspeed of ~900 km/h

The knurled center knob was then tightened to secure it in place

The Pilots Radio Compass Indicator

Tuning Unit, MC-125 for Receiving and Transmitting Command Set SCR-AJ(and AL)-183 Douglas In such compassesThe MC 125 Tuning Unit is a component of the WWII era airborne communication system Receiving and Transmitting Command Set SCR AJ(and AL) 183, as used in the C 47 Dakota Transport with a similar version used in the TBM Avenger Torpedo Bomber. This remote tuner was typically positioned within arms length distance of the pilot in order to mechanically tune the receiving radio to the desired frequency. By turning the crank, the faceplate rotates to