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How to Use Your
Cobra 29 LTD CHR
Contents
Features..................................................................................................1
The CB Story.........................................................................................A1
FCC Regulations
FCC Warnings
Included Accessories
Controls & Indicators.......................................................................A2
Our Thanks to You .............................................................................A3
Cus
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Installation Installation Location Location Plan location of transceiver and microphone bracket before starting the installation. Select a location that is convenient for operation, yet does not interfere with the driver or passenger. The transceiver is usually mounted to the underside of the dash with the microphone bracket beside it. Mounting and Connection Mounting and 1 Connection Hold the radio with the mounting bracket in the exact desired location. If there is no Note interference, remove
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Installation Installation Note Connecting to an accessory fuse prevents the unit from being left 6 Plug power cable into back of unit marked on accidentally, and also “Power” . Be sure to observe polarity markings. permits operating the unit without running the engine. 7 Mount the microphone bracket on either side of Note the unit (driver’s left) In positive ground vehicles the using two screws red wire goes to the chassis and supplied. Bracket should the black wire is connected to be placed und
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Antennas Ignition Noise Interference CB Antenna Use of a mobile receiver at low signal levels is CB Antenna normally limited by the presence of electrical Since the maximum allowable power output of noise. The primary source of noise in automobiles the transmitter is limited by the FCC, the antenna is from the alternator and ignition system. is critical in affecting transmission distance. Only Typically, when signal level is adequate, the a properly matched antenna system will allow Note backgro
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Operation Operation Turning On Setting Channel Selector Turning On Setting Channel Make sure the power cord, antenna and Selector microphone are connected to their proper connectors before starting. 1 Select one of forty channels and adjust volume. The selected channel is indicated by the LED readout directly above the channel selector knob 1 The CB/PA button should be in the CB position. 2 Rotate the On/Off Volume knob clockwise to a normal listening level. 8 9
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Operation Operation Calibrate for SWR (Standing Wave Ratio) Calibrate For SWR (Standing SWR calibration is done to properly adjust the length of the antenna and to monitor the quality Wave Ratio) of the coaxial cable and all RF connections. This calibration is critical in order to achieve optimum performance. Note Calibration must be made in an open area (never in a garage). Vehicle doors must be closed. No one should be standing near the antenna. (See your antenna Note directions for more compl
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Operation Operation To Receive To Receive Note The reading will be slightly higher on Channels 1 and 40 compared to Channel 20. 5 While still holding down the mic button, set Note the S/RF SWR CAL switch to the SWR position, When switched to SWR position 1 Rotate the On/Off Volume knob clockwise to read the SWR reading. the meter needle should ideally the green RX/TX LED will be illuminated. be as far to the left as possible. 6 Repeat the same steps two through five Anything over 3 is not on Cha
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Operation Operation Selecting A Channel NB-ANL/ANL/OFF (Noise Selecting A NB-ANL/ANL/ Blanker/Automatic Noise Limiter) Switch Channel OFF (Noise Blanker/ Automatic Noise Limiter) Switch Note 1 Switch to NOR to select desired channel. The RF noise blanker is very 1 When switched to ANL the Automatic Noise effective in reducing repetitive S-Meter Limiter is activated. This helps reduce noise S-Meter noises such as ignition created by the vehicle’s electronics. interference. Swings proportionately
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Operation Operation Bright/Dim Switch RF Gain Control Bright/Dim RF Gain Control Switch The RF Gain is used to optimize reception in strong or weak signal areas. Note The RF Gain is used to optimize reception in weak signal areas. 1 Switch to BRT or DIM to control brightness of the channel indicator and multi-function meter for day or nighttime driving. 1 Rotate the RF Gain knob counterclockwise to reduce gain in strong signal areas. In weak signal areas turn clockwise to increase gain. 16 17
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Operation Operation Gate open Setting Delta-Tune Setting Delta-Tune Delta-Tune functions as a “fine tune” control enabling you to capture a more readable signal, as well as eliminate adjacent channel interference. 2 Full counterclockwise rotation opens the “gate” allowing all signals in. 1 Rotate Delta-Tune knob to the center position for optimum tuning. Gate set to Desired Setting Squelch Setting Squelch Squelch Setting (DSS) Squelch is the “control gate” for incoming signals. Gate closed 3 To
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Operation Operation To Transmit Transmit To Transmit Transmit Caution! Be sure the antenna is properly connected to the radio before transmitting. Prolonged transmitting without an antenna, or a poorly matched antenna, could cause damage to the transmitter. Be sure to read the F.C.C. Rules 1 Select desired channel. and Regulations included with 1 Push and hold mic button to transmit.Transmitter this unit before transmitting. is now activated.When transmitting, hold the Setting Dynamike® micropho
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Operation Operation RF Meter External Speaker RF Meter External Speaker This meter swings proportionately to the RF The external speaker jack is used for remote output (outgoing signal) while transmitting. receiver monitoring. Note The external speaker should have 8-ohm impedance and be rated to handle at least 4.0 watts. When the external speaker is plugged in, the internal speaker is automatically disconnected. Note 1 1 The S/RF-SWR-CAL switch must be in the Connect an external speaker to the
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Operation Operation PA (Public Address) PA (Public Address) Note Speaker should have 8-ohm impedance and be rated to handle at least 4.0 watts. Note The speaker should be directed away from the microphone to prevent acoustic feedback. 1 Connect an external PA speaker to the PA jack 3 on the rear panel. Push and hold microphone button and speak Note in a normal voice. Your voice will now transmit Activity on the CB channel will on the PA speaker. be heard through the PA speaker. Adjust volume con
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Home And Office Set-Up Temporary Mobile Set-Up Base Station Operation Base Station (From 120V AC House Current) Operation To operate your transceiver from home or office (From 120V AC you will need a 13.8 volt DC Power Pack rated at a House Current) minimum of 2 amps, and a properly installed base station antenna. 2 Plug power cable into back of unit marked “Power” . Be sure to observe polarity markings. Warning! 3 Connect properly installed and matched base Do not attempt to operate this statio
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How Your CB Can Serve You How Your CB Can Serve You • Warn of traffic problems The FCC gives these examples of permitted and • Provide weather and road data prohibited messages for channel 9. These are • Provide help in event of an emergency only guidelines and not all-inclusive: • Provide direct contact with home or office • Assist police by reporting erratic drivers Permitted Example Message • Get “local information” to find destination • Communicate with family and friends Yes “Tornado sighte
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How Your CB Can Serve You How Your CB Can Serve You Code Meaning CB 10-Codes CB 10-Codes 10-29 Time is up for contact Citizen Bands have adopted the “10-CODES” for 10-30 Does not conform to FCC rules standard questions and answers. These codes 10-33 Emergency traffic provide quick and easy communication, especially 10-34 Trouble at this station in noisy areas. Following are some of the more 10-35 Confidential information common codes and meanings: 10-36 Correct time is Code Meaning 10-37 Wrecker
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Frequency Ranges 29 LTD CHR Specifications GENERAL The COBRA 29 LTD CHR transceiver represents one Channels . . . . . . . . . . . . . . . . . . . . . . . . . . CB - 40 CH of the most advanced AM two-way radios used as a Frequency Range . . . . . . . . . . . . . . . . . . CB - 26.965 to 27.405 MHz Frequency Tolerance . . . . . . . . . . . . . . . 0.005 % Class D station in the Citizens Radio Service. This Frequency Control . . . . . . . . . . . . . . . . . PLL (phase lock loop) Synthesizer unit f
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Limited One Year Warranty Optional Accessories COBRA ELECTRONICS CORPORATION warrants that its COBRA CB Radios, and the component parts thereof, will be free of defects in workmanship and materials for period of one (1) year from the date of first consumer purchase. This warranty may be enforced by the first consumer purchaser, provided that the product is utilized within the U.S.A. Replacement Mounting Replacement Thumb Screws Replacement DC Power Cord COBRA will, without charge, repair or repl
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Optional Accessories cont. 4 Pin Replacement Dynamic 4 Pin Noise Canceling Power Microphone Microphone Microphone HG M73 HG M75 HG M77 Dynamic External Speaker Noise Canceling External Noise Canceling With Talk Speaker Back External Speaker HG S100 HG S300 HG S500 Optional Accessories • You can find quality Cobra products and accessories at your local Cobra dealer, or in the U.S.A., you can order directly from Cobra. See ordering info on page 37. 36
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29 LTD CHR The CB Story Cobra Electronics Corporation The Citizens Band lies between the shortwave 6500 West Cortland Street broadcast and 10-meter Amateur radio bands, Chicago, IL 60707 USA Operating Instructions for and was established by law in 1949. The Class D two-way communications service was opened in 1959. (CB also includes a Class A citizens band your Cobra 29 LTD CHR 2 and Class C remote control frequencies.) If You Think You Need Service FCC Regulations For technical assistance, plea
