Aft Section

The aft section of the left console holds communication and navigation controls.

TACAN Control Panel

The TACAN Control Panel is used to enter the desired TACAN channel, mode, and audible volume for the monitoring of said channel by the aircrew. The panel is duplicated in both cockpits, and the panel in command of the TACAN receiver is selected with the NAV CMD button of the Communication Control Panel.

Channel Knobs

On the control panel there are two Navigation Channel Control knobs (7, 4 and 3), with the left (7) controlling the first two digits of the channel value (hundreds and tens), and the right (4 and 3) controls the single unit (ones) values. The right knob also includes an outer ring which sets the X or Y value for the desired TACAN channel.

Test Button and Lamp

Between these two knobs is the TEST button (6), which performs the ground testing cycle after warmup, and can also be used to perform an in-flight confidence test of the system's performance.

The lamp above the button illuminates to indicate test status.

See 7.19.4 Navigation test procedures chapter for further information.

Volume Knob

To the upper right, the VOL knob (2) is available to set the desired audio level for the received TACAN station.

Function Selector

The TACAN Function Selector Knob (1) determines the presentation and type of information provided on the HSI, ADI, and BDHI, respectively.

💡 Air to Air TACAN functionality requires the channel to be set 63 channels above or below the cooperating aircraft, but on the same range- X or Y. So a tanker on 123Y should be set to 60Y in the F-4.

Communication Control Panel

The Communication Control Panel provides selection and mode of the UHF radio in the aircraft.

Command Buttons

The panel is duplicated in both cockpits, and control over the radio is determined through pushing the COMM CMD Button (10) in the respective seat; the button will illuminate green (9) in the seat in priority. In the same fashion, the NAV CMD button (7) dictates which seat has control of the TACAN settings; its button will also illuminate (8) on the panel of the seat that has command (control) of the system. Each press of a command button will toggle who is in command of the system.

Radio Volume

Beneath the COMM CMD button is the radio volume (11) for the respective seat.

Squelch Switch

Close to the NAV CMD button is the Squelch switch (6), which enables or disables receiver squelch.

Frequency and Channels

The A-3-2-T Selector knob (5) sets the first digit of the manually selected frequency (3 or 2) of the UHF radio.

💡 Due to engine limitations, modes A and T, belonging to the HAVE-Quick functionality, are not simulated.

The four Frequency Selection Knobs work in concert with the A-3-2-T knob and Preset/Manual switch. Frequencies are entered beginning with the 3 or 2 selection on the A-3-2-T Selector, and can be entered from 225.00 to 399.975 MHz in increments of 0.025. With the Preset/Manual switch (4) in the Manual position, the UHF radio is directly set to the displayed channel. In the Preset position, the set channels can be entered into the COMM CHAN memory, with the desired position selected with the Comm Channel Control knob (12) (the smaller knob to the left of the Preset/Manual switch), and displayed in the COMM CHAN window. Channels can be stored in the displayed channel preset with the SET pushbutton. Once stored, channels are directly selected using the Comm Channel Control knob with the Preset/Manual switch in the Preset position.

Directly underneath the Comm Channel Control Knob is the Aux Channel Knob (13) and Indicator. This knob is used to access 20 common preset channels that cannot be changed in the cockpit.

The Aux Volume Control knob (1) on the lower right of the panel raises and lowers the volume of the Aux receiver channel.

The Set button (14) can be used to save the channel frequency that is currently selected by the Frequency knobs. The frequency will be saved as the currently selected channel.

Tone Button

The Tone Pushbutton (3) is used for transmission of a Time of Day (TOD) signal along with a tone to friendly aircraft requiring a Time of Day update for proper HAVE-Quick functionality.

💡 Due to engine limitations, the tone button, belonging to the HAVE-Quick functionality, is not simulated.

Comm Function Selector

The Comm Function Selector Knob (2) determines the current configuration of the radio system.

Cockpit Altitude Gauge

Displays the current pressure inside the cockpit as a means of equivalent effective cabin altitude above mean sea level in 1000 of feet.

That is, if the gauge reads 5, the pressure inside the cabin is equivalent to an altitude of 5000 ft altitude MSL.

To prevent sickness and hypoxia, the pressure should be observed and oxygen supply adjusted accordingly:

See 3.7 Utility chapter, Oxygen section for further information.

Oxygen Quantity Gauge

It has a range from 0 to 10 liters. Loss of electrical power is indicated by appearance of a power-OFF flag on the instrument face.

VOR/ILS Volume Control

The volume control consists of two knobs: one square knob (1) adjusts VOR and localizer audio, while the round knob (2) controls the marker beacon audio.

See 3.3.4 VOR/ILS Chapter for further information.