TX2700
INSTRUCTION MANUAL
PAGE 5
OPERATION – GENERAL FUNCTIONS
VOLUME ON/OFF
Rotate the
volume
control clockwise past the ‘Click’ to turn
the TX2700 ON. Continue to advance the control clockwise to
increase the volume. Rotate the control counter-clockwise to
turn the radio off.
NOTE:
At minimum volume setting there is still suffi cient
volume to be heard in a quiet cabin environment.
SQUELCH CONTROL
The Squelch control is used to eliminate the background noise
when there are no signals present. To adjust the Squelch, fi rst
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 by briefl y pressing the or
keys. The selected channel is displayed on the LCD display.
Press and hold either key to quickly advance upwards or
downwards through the channels. Release the key when the
required channel is displayed or:
Select the required channel via the Rotary ‘
Channel
Selector
’. The selected channel number 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 TX2700 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 inter-
ference caused by engine ignition systems etc. This
allows clearer reception of weak signals even under noisy
electrical conditions.
When the
NL
key is selected, ‘NL’ is displayed on the LCD.
SCANNING
The TX2700 is fi tted with a Scan function that allows a
group of user selected channels to be scanned for activity.
Your TX2700 has a Scan memory which remembers which
channels you would like to Scan. By default your TX2700 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 or key or ro-
tary selector and check to see if ‘M’ is displayed to the lower
right of the channel number.
If ‘M’ is displayed, the channel is 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 ‘M’ appears to the lower right of
the channel number, the channel has been added to the Scan
memory, otherwise it has been removed.
To Scan
Adjust the Squelch control so the radio is quiet, then briefl y
press the
SCAN
key. A high beep will be heard, ‘SCAN’ will
appear in the display and the channel numbers will change
rapidly as the radio begins scanning. If a signal is found, the
radio will pause on that channel and will remain there as long
as the channel remains busy. Once the channel has been clear
for 5 seconds, scanning will resume.
NOTE:
You must have at least two channels programmed into
the Scan memory otherwise the radio won’t scan.
To change the Scan direction
Press the or key. The radio will scan in the direction of
the selected channel key.
