User's Manual

VTU-3 Users Guide

Page 9 of 18

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A major difference between the VTU3 and previous display units is the display in the lower

center of the screen. This display is the “MODE INDICATOR”. The MODE INDICATOR

shows what mode the Up and Down buttons are in. In Figure 1 the menu indicates “VX”

(there is a symbol of a speaker “X”next to the V). This menu selection indicates that the

buttons are in the Master Volume control mode. In Figure 2, the MODE INDICATOR “B”

indicates that the buttons are in the Brightness control mode.

The MODE button changes the effect of the Up and Down Arrows. The PTCII has Up and

Down arrows but they have a single function (volume control).

Pressing the “Mode” button changes the MODE INDICATOR. This switch will toggle the

MODE INDICATOR between “Master Volume” and the “Brightness” modes. The two

small arrow buttons (UP and Down) on the far right of the unit will increase or decrease

the intensity of the screen brightness or the volume of the audio signal being presented by

the display unit depending on the state of the MODE INDICATOR.

The SCAN/LOCK/IDLE mode indicator reflects the state of the tracker:

• SCAN: actively receiving and tracking any and all VLU reply codes.

• LOCK: only receiving and tracking a specific VLU reply code, and averaging the

direction information for that VLU.

• IDLE: not actively receiving or tracking any VLU reply codes

The “SCAN” INDICATOR shows that the system will react to any signal that is received. If

the system is reporting several different VLUs being detected and the operator wishes to

track a select unit out of the group the mode can be switched from the “SCAN” mode to

the “LOCK” mode and only the selected unit will be tracked. Normally the switch from

“SCAN” to “LOCK” would be accomplished by pressing the “SCAN/ENTER” button but on

this select unit that feature is inactive.

Figure 2 VTU3 Display Unit (Brightness Manual mode)

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Down

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