18
5. Basic Operations
Turning the unit on and off
Press the power switch or turn the ignition key to ACC or ON
position according to the option selected during installation.
Press the power switch again or turn the ignition key to OFF
position to turn off.
Audio Volume level setting
Rotate the VOL knob clockwise to increase the audio level,
counterclockwise to decrease. Set it at the desired level.
Squelch level setting
A squelch eliminates white-noise (the background noise when
a signal is not received).
Higher level settings will keep the squelch “closed” more
tightly for quieter monitoring, but weak signals will not be
heard. Lower settings allow weaker signals to “open” the
squelch but noise may also cause it to open.
1.
Press SQL key. SQL icon appears on the dis-
play and the squelch level will be shown at the
position where the memory number is dis-
played. 21 levels, between 0 and 20, are avail-
able. “0” is the lowest setting.
2.
By rotating the main dial or by using the UP/
DOWN keys on the microphone, adjust the
squelch to the desired level. To return to nor-
mal use, press PTT or any key on the front
panel; or if there are no operations within 5
seconds, the unit will store the setting and will
return to its original status.
The new squelch level will be stored in the CPU until another
adjustment is done.
Squelch level
PWR key
VOL knob
Minimum
volume
Maximum
volume
IMPORTANT: All figures showing the frequencies and values in this manual are based on DR135(144MHz
band).