Emergency/Calling & Lock Button; Squelch Control Knob; Antenna Connector; Power 13.2Dc - TTI TCB-550N Manual De Uso

Lock : Press this button for more than 2 seconds to activate and
deactivate the keypad lock function. This function locks only the
channel selector, AM/FM & Scan button. Other buttons and selectors
work normal.
7) Emergency/Calling and Lock Button
Emergency/Calling Pressing this button momrntarily
once will lead you to the emergency channel, "CH 9"("CH
19" in some bands) and the EMG icon will be displayed.
Pressing this button twice will lead you to the calling
channel, "CH 19" ("CH 9" in some bands) will be displayed.
To return to the previous operation mode, momentarily press the
emergency button again.

8) Squelch Control knob

Auto Mode : Turn this knob conter-clockwise until you
hear the sound. You transceievr is in the Automatic
squelch mode. This works better in FM mode. than AM
mode. If you are using AM mode, you are recommended
to use the manual squelch mode.
Manual Mode : Turn this knob counter-clockwise until you hear the
background noise(but before click sound to enter the automatic
squelch mode) and then turn the knob a little clockwise until the noise
disappears. In this way, you get the best receive sensitivity.

9) Antenna Connector

Insert the mail connector of the antenna cable into
this fe-male antenna connector.
10) Power 13.2 DC
The power supply cable is connected to this port.
DC
13.2V

11) EXT-SPK Jack

Insert the mail connector of the antenna cable into
this fe-male antenna connector.
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TCB-550N