Question about Cobra Radio Communications

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I have a Cobra 29 LTD in my truck, and another in my Jeep. Both have had problems where I get no sound for a period of time, even though I know there are transmissions. Then all at once, the sound comes on. Recently, the one in my truck went silent, never to be heard again. It shows reception on the signal strenght meter, but I can only hear sound faintly, when I put my ear right next to it. Any ideas ???

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Posted on Jan 02, 2017

Dodgem250
  • 68 Answers

SOURCE: Cobra 29 LTD Classic Operations Manual

For the operation manual, go to cobraelec.com or:

http://cobra.com/downloads/manuals/29LTDCLA.PDF


Thanks!
Dodgem

http://dodgem250.angelfire.com

Posted on May 10, 2008

Mechanic688
  • 204 Answers

SOURCE: cobra 29 LTD classic LCD channel display replace

Hello, the channel display is kind of touchy, as far as getting to it and of course it is soldered to a small circuit board and there is a certain way it goes back in. There is about 9 legs on top and 9 on the bottom that need to be unsoldered and resoldered( carefully). You can buy them in red,green, and bue. The meter light is pretty straight forward. You have a hot and ground wire. I used to use colored LED lights in the meters, way cool. They are not hot, and they last almost forever. The LED's are fairly easy because if you hook it up backwards, it just won't do anything. Let me know if you feel comfortable doing the solder work, and take a look inside the bottom cover at the channel selector because it has to come out with the channel readout. I used to charge $25.00 just for that because it would take me an hour just for the ch. selector, and about 15 min. for the meter light. Let me know one way or the other,,, Mechanic

Posted on Nov 05, 2008

  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

Wow. That's not at all a solution to what this guy is asking. And why all the caps??

The one point jm77437 has that is correct is that you do not set the radio, you set the antenna. The rest is blah blah.

Here is how you tune your antenna for you radio. First off it depends on what kind of antenna you have. most fiberglass antennas have a tunable tip to adjust the height of the antenna. Metal whips either have a collar at the base that the whip will either slide up or down in to adjust the height. The other type of metal whip's you have to physically clip to shorten the antenna, you must be careful with this type because once its clipped, that's it. You cannot add what you cut off.

I am going to give this example using a metal whip with an adjustable collar.

First after your radio is hooked up in the vehicle, drive to an open lot. Buildings and other structures can cause extra reflection. turn to channel 1. Flip the meter to CAL. Key the mic without talking. Now turn the CAL knob up until the needle reaches the little upside down triangle all the way to the right marked CAL. Now you have just celebrated your radio for your setup to measure you SWR. Now while still holding the key, flip the meter switch to SWR. The needle will move, and where it stops is your SWR reading. The lower the better. Anything under 1.5 is considered really good. But still, the lower the better.

Make note of what your SWR was on ch 1.

Now flip to channel 40. Repeat the SWR process. You must recalabrate each time you take a reading.

Now like jm77437 said. If your SWR reading is higher on 40 then 1, then your antenna is too long, and you must make it shorter. Loosen the collar and lower the antenna in the collar 1/4 inch at a time. check the swr each time you adjust the antenna.

If your SWR reading is higher on channel 1, then your antenna is too short. You must make your antenna longer. Do this by loossening the collar and pulling the antenna upward in the collar 1/4 inch at a time, again checking the swr each time you adjust the antenna.

What you want to achieve is having the same SWR reading on channel 1 and 40. then you have the best match you are going to get with that antenna.

If your swr is under 1.5 on all channels, you don't need to fuss unless you are a perfectionist. then by all means go ahead.

If your reading is higher then 3, or your ant light comes on, something is really wrong. Make sure your antenna is connected all the way, and the coax is not damaged.

Its important to have an appropriate SWR because if you do not, you are reflecting too much signal back into the radio, and eventually you will burn out your final transistor, and your radio will be toast.

Some tips: make sure you check the swr with the doors and windows shut. Make sure you are in an open lot. Remember to calabrate ecah time you take a reading. If you have had your radio peaked by a radio shop, and they have lowered your dead key, or have done a swing modification, then the meter in your radio will not work when taking an SWR reading and you will have to use an external meter.

Posted on Apr 24, 2009

  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Posted on Apr 24, 2009

  • 773 Answers

SOURCE: cobra 29 ltd classic ant light

Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.

Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.

When your raise the power in a radio, you will notice more when the antenna is not properly tuned.

In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.

the more power you put out, the more important it is to have a good match.

But an external SWR meter, and check it. be careful if the ANT light is on.

You might also want to check your coax, connections to it, and your antenna for anything wrong.

Posted on Apr 24, 2009

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Service manual 1990 American LTD by Cobra


  • Hi, I can help.

  • 1990 was still a front mic. Even the side mic cobra LTD from 1988 and before are the same exact wiring set up except the mic input is on the side.
  • Go to this link to download the manual free. http://www.mediafire.com/?bip1205nozcpu3o and click on "Click here to start download from MediaFire.." and the PDF will drop onto your PC.

  • If you have any questions about that 29 let me know.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

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Cobra 29 LTD Classic Operations Manual


For the operation manual, go to cobraelec.com or:

http://cobra.com/downloads/manuals/29LTDCLA.PDF


Thanks!
Dodgem

http://dodgem250.angelfire.com

May 05, 2008 | Cobra 29 LTD CB Radio

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