Specifications

DCS

[P-51D Mustang]

COCKPIT

SCR-522-A VHF Radio

The SCR-522-A command radio is a push-button controlled transmitter-receiver that operates in the

100 - 156 MHz band and is used for radio homing and two-way voice communication. The control

box is located just aft of the Electrical Control panel on the right side of the cockpit. A microphone

button is located on the throttle handle. The radio operates on one of four preset frequency

channels. The frequency of each channel is set internally in the radio on the ground and cannot be

changed in flight. The desired channel is selected in flight by the pilot using the Channel Selector

buttons. A Mode switch is provided that allows the pilot to select remote operation (REM) using the

throttle Mic button, continuous reception (R), or continuous transmission (T).

Figure 76: SCR-522-A VHF Radio

LIGHT DIMMER SWITCH. The Light Dimmer switch is used to cover the Selected Channel lights

with a dimmer cap to minimize light glare in the cockpit.

OFF BUTTON. When pressed down, the OFF button disables the radio.

CHANNEL SELECTOR BUTTONS. The Channel Selector buttons are used to set the channel for

reception and transmission. Only one channel can be selected at a time.

 "A" channel is usually used for all normal plane-to-plane communication or for plane-to-

ground communication with a Controller.

 "B" channel is common to all VHF-equipped control towers. It is normally used to contact

the control tower for takeoff and landing instructions.

 "C" channel is frequently used in contacting homing stations.

 "D" channel is normally used for plane-to-ground contact with D/F stations, and as a

special frequency which is automatically selected at regular intervals by the action of a

contactor unit.

Light Dimmer switch

OFF button

Selected Channel

lights

Mode Lock switch

Mode switch

Channel Selector

buttons