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
KEyPaD FUNCTIONS
All controls on the tX4500 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
5 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
knob fully
counter clockwise to un-mute the radio then adjust the
volume while listening to the background noise. When
finished, readjust the
Squelch
knob 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
knob. rotate the knob 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
knob. 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 tX4500 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
knob
fully counter-clockwise until the background noise is
heard and the indicator is displayed on the lcD.
now advance the
Squelch
knob 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
knob 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
knob 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.
MICROPHONE
channel
up
channel
Down
Push to
talk
Priority
skip/call
