Thrane&Thrane TT-6222A VHF DSC, User Manual

Page: 26 / 90

Chapter 2: Operation
12 General use and navigation
Changing the display light, night view
Red text on black background is available for optimal night vision.
To dim the display backlight , e.g. to give comfortable night vision, press, hold
and turn the selector knob anti-clockwise. The display shows a brightness bar.
At the brightness value 45 the display changes to
night view with red text on
black background.
To return to day vision press, hold and turn the selector knob clockwise until
the display changes and it reaches the desired brightness.
The radio has two colour themes: Black text on a white background (default)
or white text on black background. To change the
color theme see System
setup on page 42.
Adjusting the squelch level
With the Squelch control you can manually adjust and suppress noise
in order to optimize the quality of the received radio communication.
When hearing noise or an unwanted signal, turn the squelch button
clockwise until the speaker is muted.
Use with a TT-6204A Control Speaker Microphone
When a TT-6204A Control Speaker Microphone is connected to the radio, you
can operate the radio with the Control Speaker Microphone. An occupied
message is shown in the radio's display. At any time you can take control over
the Control Speaker Microphone by pressing any key on the radio.