PA G E 6
I n s t r u c t I o n m A n uA l
t X 4 5 0 0 s
MICrOPHONE
KEyPAD FUNCTIONS
All controls on the tX4500s front panel have
multiple functions. the primary functions are labelled
in BlAcK, while the secondary functions are labelled
in rED. to access a primary function simply press the
required key.
to access a secondary function, briefly press the
F
key followed immediately by the required key.
NOTE:
when using the
F
key to access other
functions,
F
is displayed to indicate that ‘Function’
mode is activated. If the required function is not
selected within 6 seconds the
F
key selection will
time out with a low beep and
F
will disappear from
the display.
more detailed descriptions of these key functions are
included in this ‘General operation’ section.
VOLUME
rotate the
volume
control clockwise past the click
to turn the radio on. rotate the
volume
control left
or right to adjust the volume.
If no sound is heard, rotate the
Squelch
control
fully counter clockwise to un-mute the radio then
adjust the volume while listening to the background
noise. when finished, readjust the
Squelch
control
to re-mute the radio.
NOTE:
At the minimum volume setting there is
still sufficient volume to be heard in a quiet cabin
environment.
SELECTING CHANNELS
to select the required channel, rotate the
channel
control. rotate the control clockwise to select a
higher channel or counter clockwise to select lower
channels. the selected channel is displayed on
the lcD.
SqUELCH
the squelch is used to eliminate any annoying
background noise when there are no signals present.
the squelch can be opened or closed using the
Squelch
control. when the squelch is open the
receiver’s background noise can be heard and the
symbol is displayed. when the squelch is closed
the receiver remains quiet while there are no signals
present but any incoming signals will override the
squelch and be heard in the speaker.
Adjusting the Squelch level
the tX4500s features a continuously variable
squelch control system allowing the user to set the
squelch for optimum performance.
to adjust the squelch, first rotate the
Squelch
control fully counter-clockwise until the background
noise is heard and the indicator is displayed on
the lcD. now advance the
Squelch
control slowly
clockwise until the noise is just extinguished and the
indicator disappears. At this point the receiver
will remain quiet while no signals are present but
an incoming signal will override the squelch and
be heard in the speaker. As the
Squelch
control
is advanced further clockwise the squelch action
is progressively increased and stronger incoming
signals are needed to overcome it.
NOTE:
If an incoming signal is very weak and is
close to the minimum squelch level it may become
broken or ‘chopped’ by the squelch action. to
prevent this simply turn the
Squelch
control fully
counter-clockwise to open the squelch. this will
allow a clearer signal.
SIGNAL METEr
the signal meter indicates the relative strength of
the incoming signal in numerical format. signal
strengths are displayed on the lower right of the
channel display in values from 0 to 9. signals above
strength 9 are displayed as 9+.
NOTE:
refer to the
configuration menu
for
other options that can be displayed in this location.
channel
up
channel
Down
Push to
talk
Priority
skip/call
46885-4_TX4500S_IM.indd 6
4/06/14 3:08 PM
