Question about Cobra 29 LTD CB Radio

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I run a 47" led lightbar for my business. When I have the lights on , I can hear the lights cycling thru my cb. I have moved antennae around, grounding everything, noise canceller. Still hear the sounds.

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Put a good ground wire onto your cb and make sure the external speaker (if you use one has a sheilded cable.


Posted on Feb 28, 2009


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1 Answer

Connex 4600HP, recently added a bed cover to my truck and had to move my antenna, now that I moved it, I am getting a squeal on my cb when I key the mike, especially with the talkback on, which I have left...

The only thing that comes to mind is to make sure the antenna is well grounded and to make sure that where it's been re routed that there are no power wires next or close to the antenna wire which can cause interference which will be more noticeable once you turn on the truck.

Sep 23, 2011 | Connex 4600 Base CB Radio

1 Answer

I can only tranmitt in close range, as i move away i lose thier signal. no one can hear me unless im right next to them.

Antenna choice is the most important step in for cb radio or any receiving radio,without knowing what you have or the way it is mounted,you must make sure it is made to be used for standard cb radio,channels 1-40 with or without sideband,if that is what you have.No matter what you have the antenna most likely will have to be adjusted to your radio,having the radio's operating manual or antenna manual/packaging would probably provide some insight to this.There is a wealth of info for SWR adjustment of antennas online,just search it.A well trusted cb repair shop would be the best step,they can get you operating to the best of your needs,obviously bring vehicle with the radio setup..Hope this sheds some light on your situation.

Sep 04, 2011 | Cobra 29 LTD CB Radio

1 Answer

I can hear others but cant talk out

I may need more info then provided.

There are a few reasons this may be. If you are new to CB this could be 1 possible reason.

You may be experiencing "Skip". Skip is when the ionosphere is charged with energy by a solar flair(s), which causes radio waves to skip and bounce across them. Normally radio waves are line of sight. Meaning, the curvature of the earth prevents radio waves from traveling extreme distances. When skip is "Rolling" (meaning, skip is happening) the radio waves can bounce and skip around the earth and travel hundreds and even thousands of miles further then the typical 8 to 12 miles they normally travel.

There are a lot of guys out there that run "big power" using linear amplifiers to boost the power of their radio into the thousands of watts. They are more likely to "shoot a skip" much further then a "barefoot" radio. (radio alone with no amplification). Also they are very likely to key over lower powered signals.

So what may be happening is, you are hearing a CB operator(s) hundreds or thousands of miles away, who is running a lot of power. You can hear him because he is running a lot of power, so his signal goes very far.He cannot hear you either because your signal is not strong enough, or other CB operators running a lot of power are keying over you when you try to talk.

This is very like now because we are going into a solar flair cycle which lasts about 11 years. There will be an extreme amount of solar activity, so you will often hear skip rolling. Recently, in the past few months it has been going every day. Nights are usually quieter due to the fact that the sun is not out, although there may still be some skip going on.

You may like to try to shoot a skip. It will be hard with a barefoot radio on a busy channel. You may have luck in the evening on a quiet channel you hear a person or 2 talking. Try talking to them and ask them what state they are in. You may be surprised by what they answer.

If the issue is not skip, and you know who you hear is local, then there may be a few reasons.

You antenna may not be tuned to best SWR. Refer to your manual that came with the radio, and antenna under SWR.
If you ANT light comes on when you key, you have a bad antenna problem for sure.
If you have been keying it with that light coming on, and it has worked up until this point, you may have blown out your final transistor. Then the radio needs repair.
Your mic gain may not be high enough. For a stock CB you might as well turn it all the way up and leave it.

Jul 31, 2011 | Radio Communications

1 Answer

IT QUIT modulating to one can hear me but it is working thru talkback

Hi, my name is John. Welcome to FixYa. Check your antenna connection, make sure you are getting a good ground. If you need further, let me know, always glad to help. Thanks for choosing FixYa. good luck...John

Oct 30, 2010 | Cobra 150 GTL DX Base CB Radio

1 Answer

First the light in the meter is out. Next People can hear me but when they come back they break up. It seems to happen more when the truck is moving. When I key the mic up the green light turns red and the...

Check your antenna, have someone tap on it with a non-conductive stick (while standing several feet away) while you listen and watch the transmit for an intermittent problem coinciding with the tapping. If that checks good then check your coax and connectors.

Your panel meter may need a new lamp, an LED would last longer than an incandescent. Be sure to add a limiting resistor in series with an LED for 12vdc.

Jul 14, 2010 | Cobra 29 LTD CB Radio

3 Answers

How do i install a cb radio on a pick up truck

You will need a CB radio antenna, The CB radio and mounting hardware as well as the power wire.

Choose a place to mount the radio. Mount it. Run the power wires from the radio to the fuse box. Put red wire in with the fuse that is hooked to switched 12 volt. Ground the black wire to any metal of the vehicle.

Next find a place to mount the antenna. If you use a mag mount, the roof of the cab is a best bet. Run the wire into the vehicle, it can go through the door, just make sure its not going to get pinched.

Hook the coax from the antenna to the radio

Now you have to tune the antenna. this is important because if you don't you you will blow the transmit final transistor out in the radio.

This link will take you to an article that will explain how to tune your antenna.

Nov 04, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Problem while matching CB

You need to understand how to tune an antenna and how the antenna works.

read this article

How to tune your antenna

and here is a list of causes for high SWR

Oct 28, 2009 | Cobra 29 LTD CB Radio

1 Answer

S it my CB antenna or something else

take a 9 foot wire to the bad radio put the the wire into the center of the ant jack a see if you can hear your buddy glass mount ant are ****.
9 foot whip is best in car/truck 4 foot fiberglass cophased are next 4 foot are next mags are ok but over time and moving around they will mess up you paint

Jul 07, 2009 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good

1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Jun 05, 2009 | Cobra 29 LTD CB Radio

1 Answer

Keying the mike

Hello Adam, first off, do not unhook the antenna then key the mic; you run the risk of blowing the final transistor out of the radio, then it will not TX.
The digital TX lights can be adjusted high or low by a cb tech. All they are is a general reference as to how much power is being dead keyed; usually around 4 watts.
For the best performance, the antenna needs to have the SWR set with a meter so all your signals are getting in and out. A mismatched antenna system can lose you about half of your power and range; and that's hard on the radio also.
If your radio was tuned up by a shop tech, you would see the digital go part way up, but when you talked into the mic, the digital would go almost all the way up. I hope this clarified the situation for you,,, Let me know,,, Mechanic

Oct 28, 2008 | Radio Shack TRC-503 CB Radio

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