GME TX4400 - Manual (Page 5)

TX4400 INSTRUCTION MANUAL PAGE 5
SQUELCH
The Squelch is used to eliminate any annoying background
noise when there are no signals present . The TX4400
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 ‘BUSY’ indicator is displayed on the LCD .
Now advance the Squelch control slowly clockwise until
the noise is just extinguished and the ‘BUSY’ 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,
which will allow the signal to be heard clearly .
MONITORING FUNCTION (MON)
When using CTCSS, press the Squelch knob to temporarily
open the Squelch to allow you to listen for signals on the
channel . For a full description of the MON function refer to
the CTCSS section .
SELECTING CHANNELS
Select the required channel by rotating the channel selector
knob . Rotate the knob clockwise to select higher channels
and counter-clockwise to select lower channels . The selected
channel is displayed in large numbers on the LCD .
BACK LIGHTING
The Liquid Crystal Display and function keys are backlit for
easy viewing at night or in low light situations . The LED
back lighting is on at all times while the TX4400 is
turned on .
To DIM the backlighting, briefly press the F key, followed
by the DIM key . Repeat the sequence to restore the
backlighting to full brightness .
DUPLEX SWITCH
Duplex operation allows the TX4400 to transmit on a
different frequency to that which it receives . This allows
operation through any repeater stations in your area .
Repeaters automatically re-transmit your signal over a
wider area, providing greatly increased range .
The Duplex function operates only on channels 1 - 8 .
When Duplex is selected on one of these channels, the
TX4400 receives on that channel but actually transmits
30 channels higher .
Channel
Selected 1 2 3 4 5 6 7 8
Receive
Channel 1 2 3 4 5 6 7 8
Transmit
Channel 31 32 33 34 35 36 37 38
The TX4400 allows you to select duplex operation on
individual channels . This is particularly useful in country
areas where there may only be one or two repeaters . The
unused repeater channels can then be used for normal
simplex or direct radio-to-radio communications .
To select Duplex on individual channels:
1 . Select the required channel 1 - 8 .
2 . Briefly press the DUP key . ‘DUP’ will appear on the
display accompanied by a high beep .
To remove Duplex from a channel:
1 . Select the required channel 1 - 8 . ‘DUP’ will be visible on
the display .
2 . Briefly press the DUP key . ‘DUP’ will disappear from the
display accompanied by a low beep .
MON