Fig 2.7 - Volume bargraph on LCD display
2.3 Operation – 200/250
The operation of any of the push buttons, or
the channel selector knob is confirmed by an
audible beep from the unit. The operation of
the controls for the 200, 250 and 250 GMDSS is
as follows -
On/Off Button (1)
Pressing this button will turn the radio on and
off (Fig 2.6). To turn the radio off it is necessary
to hold the button in for two seconds, prevent-
ing the radio being accidentally switched off.
PTT Button (2)
The PTT, or Press-To-Talk, button is used to
switch the radio from receive to transmit.
Unlike other keys, the radio will not beep if this
key is pressed, but the LCD legend will change
from to , and the bar graph will display
the current battery strength.
If the radio will not transmit when the PTT but-
ton is pressed, this may be because the selected
channel is not valid for transmission. NOTE -
transmit is also inhibited when the Dual Watch
or Scanning functions are activated.
High/Low Transmit Power Button (4)
This button will toggle the transmit power
between the preset maximum level (normally
5 Watts) and low power (normally 1 Watt). The
power setting selected will be indicated by
either the HI or LO legend on the LCD dis-
play.
Audio Volume Up (5)
This button will increase the audio volume in
graduated increments. The volume setting will
be indicated on the LCD display by the bar
graph (Fig 2.7).
Audio Volume Down (6)
This button will decrease the audio volume in
graduated decrements. The volume setting will
be indicated on the LCD display by the bar
graph.
Dual Watch (7)
The Dual Watch function enables the radio to
scan between the selected channel and the pri-
ority channel (normally channel 16). To activate
Dual Watch mode, select the channel and press
TxRx
