Cobra_19 Ultra Ii Cb Tranciever_manual

Installation (Cont.)
Ignition Noise Interference
Use of a mobile receiver at low signal levels is normally limited by the
presence of electrical noise. The primary source of noise in automobile
installations is from the alternator and ignition system in the vehicle.
Under most operating conditions, when signal level is adequate, the
background noise does not present a serious problem. Also, when ex-
tremely low level signals are being received, the transceiver may be
operated with vehicle engine turned...

Controls and Indicators
Refer to controls, indicators and connectors as illustrated below:
A. Front Panel
1.Off/On/Volume. Turn clockwise to turn power on and set the
desired listening volume.
2.Squelch. This control is used to cut off or eliminate receiver back-
ground noise in the absence of an incoming signal. For maximum
receiver sensitivity, it is desired that the control be adjusted only to
the point where the receiver background noise or ambient back-
ground noise is eliminated. Adjust until the...

9
5.CB/PASwitch. Selects mode of operation. In the CB position, the PA
function is disabled and the unit will transmit and receive on the select-
ed channel. The PAfunction should not be used unless a PAspeaker is
connected.
6.S-RF/Power Meter. Shows relative transmitter RF output power
and input signal strength when receiving. The five LED (Light
Emitting Diode) segments glow to indicate receive or transmit
activity. 
7.TX Indicator LED. This indicator will light red when in the trans-
mit mode.
8.LED...

Operation (Cont.) 
C. Rear Panel
1.ANTENNACONNECTOR:This  SO-239 connector permits connec-
tion of the transmission line cable male connector to the transceiver.
2.PUBLIC ADDRESS:An external 8-ohm 4.0 watt PAspeaker may be
connected to the PASpeaker Jack when this unit is used as a public
address system. The speaker should be directed away from the micro-
phone to prevent acoustic feed-back. Physical separation or isolation of
the microphone and speaker must be employed when operating the PA
at high...

Operation (Cont.) 
Operating Procedure to Receive
1.Be sure that the power, antenna and microphone are properly con-
nected before proceeding further. The CB/PAswitch should be in
the CB mode. The Channel 9/NOR Switch should be in the NOR
mode.
2.Turn the radio ON by rotating the VOLUME CONTROLclockwise.
3.Rotate SQUELCH CONTROLcounterclockwise until incoming sig-
nal is heard.
4.Turn the CHANNELSELECTORKNOB to select the desired oper-
ating channel.
5.Set the VOLUME CONTROLto a comfortable listening...

Maintenance and Adjustment
Your COBRACB transceiver is specifically designed for the environ-
ment encountered in mobile installations. The use of all solid state cir-
cuitry 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. Refer to the schematic dia-
gram and parts list.
1.Check connections to the source of power and make sure it is the
13.8 VDC required to operate your...

Appendix
Citizens Band radio operators have largely adopted the “10-code”for
standard questions and answers. Its use permits faster communications
and better understanding in noisy areas. The following table lists some
of the more common codes and their meanings:
CodeMeaningCodeMeaning
10-1Receiving poorly10-35Confidential information
10-2Receiving well10-36Correct time is
10-3Stop transmitting10-37Wrecker needed at
10-4OK, message received10-38Ambulance needed at
10-5Relay message10-39Your message...

Appendix (Cont.)
14 AFew Rules That Should Be Obeyed
1.You are not allowed to carry on a conversation with another station for
more than five minutes at a time without taking a one-minute break, to
give others a chance to use the channel.
2.You are not allowed to blast others off the air by overpowering them
with illegally amplified transmitter power, or illegally high antennas.
3.You cant use CB to promote illegal activities.
4.You are not allowed to use profanity.
5.You may not play music in your CB....

15 YesÓAtornado sighted six miles north of town.Ó
NoÓThis is observation post number 10. No tornado 
sighted.Ó
YesÓI am out of gas on Interstate 95 at mile marker 121.Ó
NoÓI am out of gas in my driveway.Ó
YesÒThere is a four-car collision at Exit 10 on the Beltway, 
send police and ambulance.Ò
NoÒTraffic is moving smoothly on the Beltway.Ò
YesÓBase to Unit 1, the Weather Bureau has just issued a
thunderstorm warning. Bring the sailboat into port.Ó
NoÒAttention all motorists. The Weather Bureau advises...

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