Question about Cobra 29 LTD CB Radio

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Cb radio That worked on my radio but what are all these other knobs and switches and what do they do?

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Glad that it worked for your radio. For all the controls and their functions, the user manual would be more descriptive. An online copy of a Cobra 29 LTD is available here. For your particular query, pls reference page 8. Adobe Acrobat Reader is required to view said manual.

Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 02, 2008

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the knob that turns the radio on and off is the volume potentiaometer.turn it 1/2 wayopen.the next knob is the squelch maqke sure it is all the to the left.the next knob is the mic gain and the RF gain.Set the mic gain at 1/2 and the RF gain all the to the right.the next knob is the delta tune,set it 1/2 way the next knob is the calibration knob leave it alone.Now above those knobs are little switches .the third switch from the left is for CB/PA make sure its on CB. check the WX switch and make sure it not on a weather station. and finally the last switch to the right is called a dynamic squelch switch.Make sure it is down. with all said your radio should be on and you should be able to hear sound. If not ,take an external speaker and hook it to the external speaker plug in the back of the radio.If you hear something then you internal speaker is junk.replace it .

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If I stretch a rubber band around the volume knob on cb, keeping pressure on it, it will stay on.


Sounds like the switch is worn out. Time to visit the CB Radio Shop and have them replace the on/off/volume pot.

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Cb has power but no squelch,can't recieve or transmit


Begin with
  • Volume knob 12 o'clock position
  • Squelch knob full counter clockwise
  • RF gain knob full clockwise
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  • Mic plugged in
  • Check coax and antenna connections.
  • Make sure your antenna gommet/insulator is installed correctly or it will directed gound. Treat antenna shaft as it is the positive portion of circuit.
If you have another CB check the antenna system with that rig. To verify it is a radio issue. Then dig deeper Microphone, PLL chip, Audio chip etc.

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I CANT HERE OR PUT OUT I NDONT KNOW WERE THE NOBS SHOULD BE


Big Knob settings from left to right...
First knobset...inner turn "volume" fully clockwise
... outer "squelch" fully counterclockwise
Second knobset...both inner and outer knobs fully clockwise
Third knob...chose which mode you want to use...Am or Fm (If your radio has been modified to TX/RX CB frequencies, chose AM)
Fourth knob...chose your band (If your radio has been modified to TX/RX CB frequencies, chose band D/A)
The only other knob that is important is the high/low power switch. It selects the band from the pair chosen by the band knob. I don't know if band D corresponds to high or low, so try both settings until one works.

If you can't TX or RX with these settings either there is no one talking at that time or your radio, antenna, or cable might be defective. You should get a copy of the owners manual to fully learn how to chose bands and adjust the settings. I've given you a starting point that should work but may not be optimum for all conditions.

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Is there a dial marked RX Gain? Does this radio have this feature?

M3ODQ

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do you have any knobs or switches that say 10k or just switches on the side. It should also be on AM if the other person is on AM (this is not a 10m radio anymhz it only has AM, it is a legal CB Radio) Generally you should just be able to put it on AM and talk if your on the same channel. if its been modded and has switches a 10k switch or (high low norm) these may no be in the right place. if the clarifier is unlocked that may also cause a problem, it needs to be on with the switches and knobs in the right place.

good luck! play with the switches, with someone else who has a radio.


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1 Answer

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Some times knobs go bad. I have a funky knob on one of my radio's. When ever you wiggle the knob it just makes awful noise.

If this is a similar problem, you can try to clean the knob with electrical contact cleaner.

If that doesn't work you my have to replace the knob.

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Usually if you need to rewire your on/off/knob, it is because of a faulty knob switch inside..or broken wires to the knob have come unsoldered.etc. If you have replaced the old knob with a new one,and is an exact same type with same wiring points. you can easily resolder to the orginal areas and it will work. Broken wires from the switch could be resecured to the post they came off of if you have access to the schematics diagram to your on/off switch. If you dont, you can download a PDF file from your manufactorers site..searching for your particular make and model c.b. then download the manual...at a cost or for free.. al

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