Cobra Electronics MR HH425LI VP - Manual (Page 24)

Introduction
41 Nothing Comes Close to a Cobra ® 40 English
Introduction
Getting Started Getting Started
Squelch Control
Squelch is controlled by turning the lower rotary
concentric knob located directly below the
On/Off/Volume control.
With the power On, turn the knob counterclockwise
until you hear a hissing sound, then turn the knob
clockwise until the hissing stops. This will establish a
“Baseline” squelch. By turning the knob further in a
clockwise direction, you will filter weak and medium-
strength signals. By turning the knob in a
counterclockwise direction (further from your baseline
setting), you will receive weaker signals. Squelch
control filters weak signals and radio frequency (RF)
noise so that you will clearly hear the signals you want.
NOTE
If the Squelch control is set so that you can hear a
continuous hissing sound, the Memory Scan, Tri-
Watch Scan, CTCSS Scan and DCS Scan functions
will be blocked.
Radio Speaker and Microphone
The internal Radio Speaker and Microphone are located on
the bottom front face of the radio below the lower control
buttons.
An optional Speaker/Microphone port is located at the top
of the radio between the antenna and the Power/Volume/
Squelch control. Unthread the Speaker/Microphone port
cover to access and install an optional speaker or
microphone into this port.
Talk Button
Press and hold the Talk button to transmit messages.
Release the Talk button to stop transmitting.
Backlight/Key Lock Button
The LCD will be illuminated by the backlight as long as any
button is pressed and will remain On for 10 seconds after
the button is released.
To Display the Backlight Momentarily:
Press the Backlight/Key Lock button. The backlight will
remain On for 10 seconds. If the backlight is already
On, another press of the Backlight/Key Lock button
will turn it Off.
Key Lock
To prevent accidental changes to your settings, you
can lock all of the following buttons:
■ Channel Up Button
■ Channel Down Button
■ SCAN Button
■ MEM/ESC Button
■ WX/H-M-L Button
■ 16/9 Button
■ TRI-WATCH Button
■ BAND Button
■ REW Button
■ Call/Enter/Setup Button
To Lock or Unlock the Buttons:
Press and hold the Backlight/Key Lock button for two
(2) seconds. The Key Lock icon will appear or
disappear in the LCD. When Key Lock is On, pressing
any of the listed buttons on the front of the radio will
result in a three (3) beep error message.
Both the Backlight/Key Lock button and the Talk
button are active — you can Receive (Rx) or Transmit
(Tx) a message with Key Lock On, but you cannot
change the channel.
Operating Your Radio Operating Your Radio
Squelch Control
Speaker/Mic Port
Talk Button
Backlight/Key Lock Button
Key Locked Buttons
Key Lock Icon