Ignition Noise Interference; Temporary Mobile Operation - Cobra 18WXST II User Manual

Operation
Ignition Noise

Ignition Noise Interference

Interference
Use of a mobile receiver at low signal levels is nor-
mally limited by the presence of electrical noise.
Under most operating conditions, when signal
Note
level is adequate, the background noise does not
When using the unit with
present a serious problem. Also, when extremely
cigarette adapter, turn off
low level signals are being received, the transceiv-
when not in use to avoid
er may be operated with vehicle engine turned off.
draining the battery.
The unit requires very little current and therefore
will not significantly discharge the vehicle battery.
Even though this radio has an automatic noise lim-
iter, in some installations ignition interference may
be high enough to make good communications
impossible. Consult your COBRA dealer or a 2-way
radio technician for help in locating and correcting
the source of severe noise.
Temporary
Mobile Operation

Temporary Mobile Operation

For temporary mobile operation, you may want to
Note
purchase an additional cigarette lighter adapter
from your COBRA dealer. This adapter and a mag-
Red and Orange wires are
netic mount antenna allow you to quickly "install"
connected to positive side of
your transceiver for temporary use.
socket center tip. Black wire is
connected to negative side
contacts.
Note
Radio resets to CH 9 when con-
nected to cigarette lighter plug.
14
PA EXT
ANT
13.8V DC
Operating Procedure to Receive
1. Be sure that power cord, antenna and microphone are connected to the
proper connectors before proceeding further. The weather switch should
be in the "CB" position.
2. Turn the radio ON by rotating the VOLUME CONTROL clockwise.
3. Rotate SQUELCH CONTROL counterclockwise until incoming signal is
heard.
4. Select the desired channel.
5. Set VOLUME CONTROL to a comfortable listening level.
6. Engage the SoundTracker system by depressing the button labeled ST.
Listen to the background noise from the speaker. Turn the SQUELCH
CONTROL slowly clockwise until the noise JUST disappears (no signal
should be present). Leave the control at this setting. The squelch is now
properly adjusted. The receiver will remain quiet until a signal is actually
received. Do not advance the control too far, or some of the weaker signals
will not be heard. The revolutionary SoundTracker system allows you to
reduce unwanted background noise (static) and increase the signal for bet-
ter reception.
Operating Procedure to Transmit
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 micro-
phone two inches from the mouth and speak clearly in a normal voice.
Be sure the antenna is properly connected to the radio before transmit-
ting. Prolonged transmitting without an antenna, or a poorly matched
antenna, could cause damage to the transmitter.
Operation
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