Ignition Noise Interference; Operating Procedure To Receive; Operating Procedure To Transmit; Maintenance/Adjustment - Cobra 19 DX IV Series Owner's Manual

Operation
Operating Your Mobile Radio
Operation

Ignition Noise Interference

Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise.
Under most operating conditions, when signal level is adequate, the background noise does not
present a serious problem. Also, when extremely low level signals are being received, the transceiver
may be operated with vehicle engine turned off. The unit requires very little current and therefore
will not significantly discharge the vehicle battery.
Even though this radio has an automatic noise limiter, in some installations ignition interference
may be high enough to make good communications impossible. Consult your authorized Cobra
dealer or a two-way radio technician for help in locating and correcting the source of severe noise.

Operating Procedure to Receive

On-Off/Volume Knob
Be sure that power cord, antenna and microphone
are connected to the proper connectors before proceeding
further (see pages 4 and 5). The CB/PA switch should be
in the CB position.
To receive:
1. Turn the radio on by rotating the
On-Off/Volume knob clockwise.
Adjust Squelch/RF Gain Knob
2. Rotate the Squelch/RF Gain knob
counterclockwise until incoming
signal is heard.
3. Select the desired channel.
4. Set the On-Off/Volume knob and the
Squelch/RF Gain knob to a comfortable
listening level.

Operating Procedure to Transmit

Be sure the antenna is properly connected to the radio before transmitting. Prolonged transmitting
without an antenna, or with a poorly matched antenna, could cause damage to the transmitter.
To transmit:
Press-to-Talk Switch
1. Select the desired channel.
2. The receiver and transmitter are controlled by
the Press-to-Talk switch on the microphone.
Press the switch and the transmitter is activated; release
switch to receive. When transmitting
(on a clear channel), hold the microphone
two inches from the mouth and speak clearly
in a normal voice.
English
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Operating Your Mobile Radio

Maintenance/Adjustment

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Your Cobra CB transceiver is specifically designed for the environment encountered in
mobile installations. The use of all solid state circuitry and its light weight result
in high reliability. Should a failure occur, however, review the following, then if necessary,
replace parts only with identical parts. Do not substitute.
Check Power Source
Check Fuses in DC Power Cord
Check Microphone Connection
Check Antenna Connection
Maintenance/Adjustment
1. Check connections to the source of power
and make sure it is the 13.8 VDC required
to operate your radio.
2. Check the fuses in the DC power cord.
The main power lead (red) has a two amp
3AG type fuse in its holder. Use only the
above specified type and size fuse for
maximum protection. Failure to do so
will void the warranty.
3. Make certain the microphone is properly
plugged in.
4. Make certain the antenna is properly
assembled and connected.
If you are unable to correct the problem,
refer to product service on page 14 for
the correct procedure for warranty and
post-warranty service from Cobra.
Nothing Comes Close to a Cobra
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