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8 | GB1 instruction guide GB1 instruction guide | 9
Functions
Turning on/off
Press to turn on/off the unit. When the radio is turned on, you can
press this button to adjust the backlight (6 levels available).
Channel selection
Select the desired channel with the / buttons.
If you hold down the / buttons for 2 seconds, the channels will scroll
quickly upwards or downwards.
Transmission and reception
Select the desired channel
Press the PTT button on the microphone and speak with a normal tone
of voice to the microphone
To receive, release the PTT.
‘FLIP’ function
Thanks to this function, the unit can be mounted with the speaker facing
up or down; the display can read in either orientation.
To activate this function, keep pressed while turning on the radio: the
LCD display will flip by 180°. Hold down while turning on the radio to
restore to normal position.
Menu
In the functions Menu it is possible to change the radio’s parameters.
Press the Menu button and select the desired function (from F1 to F5)
by using the or keys. Confirm by pressing Menu again and select
the desired value with the or buttons.
The functions menu is composed of the following 5 options listed here
below:
F1 CTCSS (subaudio tones): you can select the desired CTCSS tone; you
can choose amongst 50 different tones from 67Hz to 254,1Hz. If you
select ‘OF’ the CTCSS tone is disabled.
F2 DSC codes: the codes available are from 1 to A4. If you select ‘OF’
the DCS code is disabled.
F3 SQUELCH LEVEL: it allows to select the squelch threshold level (from
0 to 9. 0 = no squelch threshold). To open the squelch and disable a
threshold previously set, press .
F4 KEYPAD BEEP: whenever a key is pressed the radio will emit a beep
tone. If it’s too loud or too soft for you, it can be adjusted with 9 dif-
ferent levels between b0 and b8. b0 = no beep.
F5 RF POWER: to select the tx power level. Two levels are available: HI
(high) and LO (low). This menu is active only in the export version.
 If you hold down the Menu button for 3 seconds, you will enable the
keypad lock; the display shows and only and keys will be active.
To disable the keypad lock push the Menu button again for 3 seconds.
Monitor
This function allows to temporarily open the squelch so as to listen to
signals that are too weak to be received. Briefly press to open the
squelch. This key also excludes the CTCSS and DCS tones programmed
on that channel.
6


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