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Cobra Electronics 29 LTD CHR manual

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Table of contents for the manual

  • Page 1

    H o w t o U s e Y o u r C o b r a 2 9 L T D C H R Cont ents Fea tures ..................................................................................................1 The CB Story .........................................................................................A1 FCC Regulations FCC W arnings Included Accessories Contr ols & Indicato[...]

  • Page 2

    Installation Installation Location 3 2 Mounting and Connection Mounting and C onnection Hold the radio with the mounting bracket in the exact desired location. If there is no interference, remov e the bracket and use it as a template to mark the location f or the mounting screws. Location Plan location of transceiv er and microphone bracket before [...]

  • Page 3

    Installation Installation 5 4 Note Connecting to an accessory fuse prevents the unit from being left on accidentally , and also permits operating the unit without running the engine. Note In positive ground vehicles the red wire goes to the chassis and the black wire is connected to the ignition switch. Note Before installing the CB radio , visuall[...]

  • Page 4

    Ignition Noise Interference Antennas Use of a mobile receiv er at low signal lev els is normally limited by the presence of electrical noise. The primary source of noise in automobiles is from the alternator and ignition syst em. T ypically , when signal lev el is adequat e, the background noise does not present a serious problem. Also , when extre[...]

  • Page 5

    The CB/P A button should be in the CB position. Operation 9 Operation T urning On Setting Channel Selector 8 T urning On Make sure the power cord , antenna and microphone are connected to their proper connectors before starting. Setting Channel Selec tor 2 1 Ro ta t e th e On / Off V olu me kn ob cl oc kwi se t o a normal listening level. Select on[...]

  • Page 6

    Operation Operation Calibrate For SWR (Standing W ave Ratio) 11 10 Note Antenna Indicator LED will illuminate when T X if SWR is high. Note Calibration must be made in an open area (never in a gar age). V ehicle doors must be closed. No one should be standing near the antenna. (See your antenna directions for more complete information). continued S[...]

  • Page 7

    Operation 13 Operation 12 Note The reading will be slightly higher on Channels 1 and 40 compared to Channel 20. Note When switched to SWR position the meter needle should ideally be as far to the left as possible. Anything over 3 is not acceptable. The antenna indicator will light. A slight antenna height adjustment (higher or lower) may be require[...]

  • Page 8

    The S/RF-SWR-CAL switch must be in the S/RF position to read the meter . Operation 15 Operation 14 1 S-Meter S-Meter Swings proportionately to strength of incoming signal when receiving . Switch to NOR to select desired channel. 1 Selecting A Channel Selec ting A Channel NB-ANL/ANL/ OFF (Noise Blanker / Automatic Noise Limiter) Switch Note The RF n[...]

  • Page 9

    Operation Operation 17 16 RF Gain Control Bright/Dim Switch RF Gain Contr ol The RF Gain is used to optimize recepti on in strong or weak signal areas . Bright/Dim S witch Note The RF Gain is used to optimize reception in weak signal areas . Switch to BRT or DIM to contr ol brightness of the channel indicator and multi-function meter for da y or ni[...]

  • Page 10

    F ull clockwise rotation closes the gate allowing only very strong signals to enter . F ull counter clockwise rotation opens the “ gate ” allowing all signals in. T o achieve the Desired Squelch Setting (DSS), turn the Squelch control counterclockwise until you hear noise . No w turn the control clockwise just until the noise stops. T his is th[...]

  • Page 11

    Setting Dynamike® This controls the micr ophone sensitivity (outgoing audio level). T o T ransmit 21 T o T ransmit T ransmit T alkBack 20 Setting Dynamike® Caution! Be sure the antenna is properly connected to the radio befor e transmitting . Prolonged transmitting without an antenna, or a p oorly matched antenna, could cause damage to the transm[...]

  • Page 12

    Operation Operation RF Meter 23 22 External Speaker RF Meter This meter swings proportionately to the RF output (outgoing signal) while transmitting . External Speaker The external speaker jack is used for remote receiver monit oring. The S/RF-SWR-CAL switch must be in the S/RF position. 1 Note The external speaker should have 8-ohm impedance and b[...]

  • Page 13

    Operation Operation P A (Public Address) 25 24 P A (Public A ddress) Connect an external P A speaker to the P A jack on the rear panel. Set CB/P A switch to P A position. Push and hold microphone button and speak in a normal voice. Y our voice will now transmit on the P A speaker . Adjust P A speaker volume with the Dynamik e® control. Note Speake[...]

  • Page 14

    T emporary Mobile Set-Up 27 Base Station Operation (From 120V AC House Current) T emporary Mobile Set-Up T emporary Mobile Operation F or temporary mobile operation you may w ant to purchase an optional automobile pow er adapter from your COBRA dealer . This adapter and a magnetic mount antenna allow y ou to quickly “install” your transceiver f[...]

  • Page 15

    How Y our CB Can Serve Y ou How Y our CB Can Serve Y ou 29 28 The FC C gives these examples of permitted and prohibited messages for channel 9. These are only guidelines and not all-inclusive: P ermitted Example Message Y es “ T ornado sighted six miles nor th of town.” No “P ost number 10. No tornado sighted .” Y es “Out of gas on I-95 a[...]

  • Page 16

    How Y our CB Can Serve Y ou How Y our CB Can Serve Y ou 31 30 Code Meaning 10-29 Time is up for contact 10-30 Does not conform to FC C rules 10-33 Emergency traffic 10-34 T rouble at this station 10-35 Confidential information 10-36 Correct time is 10-37 Wrecker needed at 10-38 Ambulance needed 10-39 Message delivered 10-41 T urn to channel 10-42 T[...]

  • Page 17

    29 L TD CHR Specifications Frequency Ranges 33 32 G ENERAL C h a n n e l s ..........................C B -4 0 C H Frequency Range . . . . . . . . . . . . . . . . . . CB - 26.965 to 27.405 MHz F requency T olerance . . . . . . . . . . . . . . . 0.005 % Frequency Control . . . . . . . . . . . . . . . . . PLL (phase lock loop) Synthesizer Operating T [...]

  • Page 18

    Optional Accessories 35 Replacement DC P ower Cord For in v ehicle use 426-002-N-001 Replacement Mounting Brack et For in v ehicle use 251-353-9-001 Replacement Thumb Screws For in v ehicle use 634-081-9-001 Replacement Microphone Brack et For in v ehicle use 741-080-9-001 Limited One Y ear W arranty 34 C OBRA ELECTRONICS CORPORA TION warrants that[...]

  • Page 19

    36 Optional Accessories cont. 4 Pin Replacement Dynamic Microphone HG M73 4 Pin Noise Canceling Microphone HG M77 Dynamic External Speaker HG S100 Noise Canceling External Speaker HG S300 Noise Canceling With T alk Back External Speaker HG S500 Power Microphone HG M75 O p t i o n a l A c c e s s o r ie s • Y ou can find quality Cobra products and[...]

  • Page 20

    The Citizens Band lies between the shortwave broadcast and 10-meter Amateur r adio bands, and was established by law in 1949. The C lass D two-way c ommunications service was opened in 1959. (CB also includes a Class A citizens band and Class C remote con trol frequencies.) FC C Regulations FCC regulations permit only “transmissions” (one par t[...]

  • Page 21

    426- 002- N-0 01 Repl ace ment D C P ow er Co rd 251- 353- 9-0 01 Replac eme nt Mou nti ng Br acket 634-081-9-001 Replacement Thumb Screws 741-080-9-001 Replacement Microphone Bracket HG A1000 21” Base Loaded, Magnetic Mount Antenna HG A1500 38” Base Loaded Magnetic Mount Antenna HG M84 4 Pin Premium Noise-C ancelling Microphone HG M84W 4 Pin P[...]