User's Manual

VTU-3 Users Guide
Page 11 of 18
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Figure 4 VTU3 Display Unit (Master Volume Control mode)
When the VTU3 is in the “Master Volume” control mode, pressing on either the up or
down arrow controls will activate the “Master Volume Indicator” as shown in Figure 4.
Each time the “Up” button is pushed the indicator bar will increase in length until the
volume maximum is reached. When the “Down” button is pressed the bar will decrease in
length until the volume minimum is reached, there is no cycling as in brightness mode.
When the VTU3 is in the “Master Volume” control mode, each push of either the Up or
Down button will sound a tone at the new volume level.
A few seconds after the last button is pressed the “Master Volume Indicator” will be
removed from the screen and the display will return to the normal operating conditions.
The VTU3 display unit does have “Smart Tones” included; this is an audio tone that will
increase in frequency as you get nearer to the target vehicle. The frequency increase is
not that the tone sounds more often but the sound of the tone gets higher as the target
vehicle is approached. The volume of the “Smart Tones” is adjusted while in the System
Menu Volume mode.
The VTU3 can receive signals that are on the correct frequency and modulated correctly
but the system cannot properly decode the signal, when this happens the screen will
display, in the lower right corner, an ICON of a “C” indicating that a carrier signal has
been detected, a “T” indicating that a tower signal has been detected, or a “V” indicating
that a VLU has been detected but the system cannot yet properly decode the reply code.
With this early version of the VTU3 the “C” is displayed for towers and un-decodable VLU
ID codes.
When the VTU3 is first activated, by turning on the ignition key, the unit will display a
series of start-up information screens progressing through a screen simply displaying the
word “Waiting” and on to a screen displaying “Scanning” then into the normal screen
presentation.
The screen displaying “Waiting” indicates that the display unit is active and waiting to
start communicating with the receiver unit. The screen displaying “Scanning” indicates
Volume
Indicator
Up & Down
Controls