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2.2 Operation – 150
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 150 and 150 GMDSS is as
follows:
On/Off Button (1)
Pressing this button will turn the radio on and
off. To turn the radio off it is necessary to hold
the button in for two seconds. This prevents 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 Rx LED (11) will go off
and the Tx LED (9) will illuminate.
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.
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).
Autosquelch On/Off Button
When pressed, this button will open the
squelch to incoming signals. The squelch set-
ting is preset at the factory to cope with most
operating conditions. If, however, it is found
necessary to change this setting, the following
procedure should be followed :
1. With the radio on, turn the volume control
(8) fully anti-clockwise (Fig 2.3).
2. Turn the radio off.
3. Without adjusting the rotary controls, hold
in the squelch button and turn the radio on.
4. A triple beep will be heard. This will be fol-
lowed by a series of beeps indicating the
squelch level being set.
5. The setting is from 1 to 8 beeps, with 8 being
fully squelched. When the correct setting is
reached, release the squelch button. The setting
is now stored in the radio.
TURN RADIO OFF
