Squelch; Rf Gain; Selecting A Channel; Channel 9/Nor/Channel 19 - Cobra 19 DX IV Owner's Manual

Operation
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Operating Your Mobile Radio
Intro Operation
Operation

Squelch

Intro Operation Customer Warranty
Assistance
This control is used to cut off or eliminate receiver background noise in the absence of an
Installation
incoming signal. Adjust until the receiver noise disappears. This will require the incoming
signal to be slightly stronger than average receiver noise. Further clockwise rotation will
Secondary Icons
increase the threshold level which a signal must overcome in order to be heard. Only
Customer
Installation
Assistance
strong signals will be heard at a maximum clockwise setting.
Secondary Icons
Squelch is the "control gate" for incoming signals.
To squelch your radio:
Notice
Adjust Squelch/RF Gain Knob
1. Full clockwise rotation closes the gate,
Notice Caution Warning
2. Full counterclockwise rotation opens
3. To achieve the Desired Squelch Setting (DSS),
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Gate Closed
Strong Signals
Medium Signals
Weak Signals
Noise
Intro Operation Customer Warranty
Assistance

RF Gain

This control is used to adjust receiver sensitivity. Maximum sensitivity allows
weak signals to be received. However, very strong signals (such as from a nearby
Customer
Installation
Assistance
transmitter) can cause distortion at that setting. Adjust until the distortion disappears.
Secondary Icons
Reducing the receiver's RF Gain eliminates distortion from very strong incoming signals.
To set RF Gain:
Adjust Squelch/RF Gain Knob
1. Full counterclockwise rotation minimizes
Notice Caution Warning
2. To achieve the desired level of distortion control, turn
3. After moving away from the strong signal,
English
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Customer Warranty
Assistance
Customer
Assistance
Caution Warning
allowing only very strong signals to enter.
the "gate," allowing all signals in.
turn the Squelch control counterclockwise until
you hear noise. Now turn the control clockwise
just until the noise stops. This is the DSS setting.
Gate Open Desired Squelch Setting (DSS)
Strong Signals Strong Signals
Medium Signals Medium Signals
Weak Signals Weak Signals
Noise Noise
gain for maximum distortion control.
the RF Gain knob counterclockwise until
the distortion is eliminated.
turn the RF Gain knob fully clockwise to
receive all possible signals.
Secondary Icons
Operating Your Mobile Radio
Intro
Operation
•
Channel Selector Knob
y n t r a a r W e r m o s t u C n i o a t e r p O o
e c n a i s t s s A
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Main Icons
e r m o s t u C
n i o a t a l l s t I n
e c n a i s t s s A
Channel 9/NOR/Channel 19 Button
s n o
Intro
g n n i a r W n i o u t a C e i c o t N
CB/PA Button
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s n o I c

S/RF Power Meter

y n t r a a r W e r m o s t u C n i o a t e r p O o t r I n
e c n a i s t s s A
e r m o s t u C
TX Indicator
n i o a t a l l s t I n
e c n a i s t s s A
s n o I c y a r d n
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g n n i a r W n i o u t a C e i c o t N
Customer
Installation
Assistance
Operation
s n o I c n a i M
Operation Customer Warranty
Assistance

Selecting a Channel

Rotate the Channel knob clockwise
Notice Caution Warning
Customer
Installation
until desired channel is displayed.
t r I n
Assistance

Channel 9/NOR/Channel 19

Notice Caution Warning
I c y a r d n o c e S Set CH 9 to obtain instant access
to the emergency channel.
Operation Customer Warranty
Assistance
Set NOR position to use the channel knob
to choose any of the 40 channels.
Set CH 19 to obtain instant access to
the information and calling channel.
Customer
Installation
Assistance

CB/PA

In the CB position, the PA function is disabled and the unit will
transmit and receive on the selected channel.
The PA function should not be used unless a PA speaker
is connected.
Notice Caution Warning
n a i M
In the PA position, the transmit function is disabled and
the microphone output will go only to the PA speaker.
S/RF Power Meter
Shows relative transmitter RF output power
and input signal strength when receiving.
The Liquid Crystal Display (LCD) segments
increase with signal strength.
TX Indicator
The TX Indicator will light when in the
o c e S
transmit mode. "Busy" will appear when
there is an incoming signal.
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Nothing Comes Close to a Cobra
®