Communications
Radio power is provided by the essential radio bus, radio bus No. 2, or standby power. Except for those radios capable of operating on standby power, control of power to respective radios is through the radio MASTER SWITCH on the left circuit breaker panel.
AUDIO SELECTOR PANEL
An audio selector panel is installed at each cockpit station. The panels control transmitter and receiver selections and volume.
(1) Communications Receive Switches Raise switches to receive desired audio. (2) Passenger Announcements Connects all selected audio to PA system. (3) Transmitter Selector Rotate to select desired facility for transmission. Volume can be controlled by rotating the inner knob (4) NAV-ADF Filter Switch Select both for total reception. Select VOICE or RANGE to filter desired signal. (5) Navigation Receive Switches Raise switches to receive desired audio.
FREQUENCY SELECTOR PANEL
The VHF, NAV and ADF frequency selectors are located in the center pedestal panel.
(1) Frequency Indicator Displays the selected frequency of the corresponding source. (2) Transfer Switch Selects the active frequency, indicated by a blue illuminated light. (3) Frequency Selector Outer knob sets tens and ones digits. Inner knob sets tenths and hundreths digits.
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