TX2720
INSTRUCTION MANUAL
PAGE 5
OPERATION – GENERAL FUNCTIONS
VOLUME ON/OFF
Rotate the
volume
control clockwise past
the ‘click’ to turn the TX2720 ON. Continue to
advance the control clockwise to increase the
volume. Rotate the control counter-clockwise to
turn the radio OFF.
SQUELCH CONTROL
The Squelch control is used to eliminate the
background noise when there are no signals
present. To adjust the Squelch, first rotate it
fully counter-clockwise until the background
noise is heard, then slowly rotate it clockwise
until the noise just disappears. If there are
signals on the channel, you should wait until
the channel is clear before adjusting the
Squelch (or select a quiet channel).
Once adjusted, the receiver will remain quiet
as long as there are no signals present, but
an incoming signal will override the Squelch
and be heard in the speaker. As the control
is advanced further clockwise the Squelch
threshold is progressively increased and
stronger incoming signals are needed to
override it. To receive very weak signals or to
disable the Squelch, simply turn the control
fully counter-clockwise.
CHANNEL SELECTION
Select the required channel using the rotary
the channel switch or by briefly pressing the
or keys on the microphone. The selected
channel is displayed on the LCD.
DISPLAY BRIGHTNESS
The LCD has two brightness levels to provide
suitable lighting for day or night use. The
default setting is bright.
The desired brightness level can be selected via
the ‘Dim’ switch located on the front panel.
TRANSMITTING
To transmit, press the
PTT
button on the
microphone. Hold the microphone 2-6 cm
from your mouth and slightly to one side so
your voice does not project directly into the
microphone. Speak at a normal voice level.
Your TX2720 has a built-in speech processor
which automatically controls the level of your
transmitted voice. It is not necessary to raise
your voice or shout into the microphone.
NOISE LIMITER
The
NL
key activates an extremely effective
noise limiter circuit which helps to eliminate
most electrical impulse interference caused by
engine ignition systems etc. This allows clearer
reception of weak signals even under noisy
electrical conditions.
When the
NL
key is selected, ‘N/L’ is displayed
on the LCD.
SCANNING
The TX2720 is fitted with a Scan function that
allows a group of user selected channels to be
scanned for activity. Your TX2720 has a Scan
memory which remembers which channels you
would like to Scan. By default your TX2720 is
supplied with all channels in the Scan memory.
To See Which Channels are Presently in
the Scan Memory
Select each channel one by one using the rotary
channel switch or by pressing the or keys
on the microphone and check to see if
is displayed to the lower right of the channel
number.
If
is displayed, the channel is in the Scan
memory, otherwise the channel is not in the
Scan memory.
To Add or Remove a Channel from the
Scan Memory
Select the required channel, then press and
hold the
SCAN
key until a beep is heard. If
appears to the lower right of the channel
number, the channel has been added to the
Scan memory, otherwise it has been removed.
