Question about Cobra 29 LTD CB Radio

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The ant light is turning on when i key the mic

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Your antenna is mismatched and your frying the radio finals , re adjust the antenna to a match of a ratio of 1 to 1.5 for the optimum output of your radio ( I used to be a chicken bander before I became a Ham operator)

Posted on Jul 12, 2009

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Posted on Jan 02, 2017

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1 Answer

What if the red ant light come on when I key the


if its the AWI light then you have an antenna problem.Most likely a mismatched antenna.get a good match,under 2.5 and you should see the light go out.

Aug 30, 2014 | Radio Communications

1 Answer

I just mounted a dual antenna set to the bed of my pick up.. i took a grinder to the underside of my bed to get a good ground to the metal...my cb turns on and i calibrated it just like i always do... i...


You need somebody with a swr meter to calibrate the installion, if your antenna light is coming on the swr readings are to high and you risk blowing the rf transistor in the radio.

May 08, 2012 | Cobra 29 LTD CB Radio

1 Answer

My ANT light comes on when ever i push the mic button but my SWR isnt that high


The meter will be more accurate and an external meter will be even better. If they show good disregard the ant light it is adjustable. It may have been set to sensitive from factory. These erroneous SWR reading can be the side effects of a PEAK & TUNE if the coils have been spread but that should also show on meter.
SWR meter calibrations
  • Switch (S/RF SWR CAL) to the CAL position.
  • Push and hold mic button
  • While holding mic button adjust the SWR CAL knob so the meter needle swings to the CAL mark on the meter
  • While still holding down the mic button, set the (S/RF SWR CAL) switch to the SWR position, to read the SWR reading. 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.

Jul 28, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a connex 33tlm3 works good whith litllie ant squels whith big could something be tuned up to much


Hi jeremy, my name is John. Welcome to FixYa. I think you are saying you are trying two different antenna,s. With the big one, sounds like you have a high SWR. or a bad ground. Make sure that your antenna is grounded good and nothing is blocking it. You will need a SWR meter and a three foot jumper to check this. How to check this is take one end of the coax jumper and run it to the radio and the other end to the meter where it is marked radio. Now take the antenna and put it in the other fitting marked ANT. Set the dial on the meter to SWR SET then turn off all your modulation,MIC GAIN, POWER MIC, now key the MIC and adjust the needle where it says calibrate all the way to the edge of the scale, not going past the edge, with the MIC still keyed up, turn the switch to SWR. that reading you see on the scale is your SWR. If it reads a three (3) or over, it is to high. Depending on your antenna, there are adjustments. Thanks for choosing FixYa...John

Dec 08, 2010 | Connex 3300 240-Channels Base CB Radio

1 Answer

Every time I press my MIC to speak into it the red lights on the RX/T and ANT light come on alerting me of a problem. How can I fix this.


RX/TX light should change to red, however the ANT light is a bad light. This means that your antenna is not adjusted properly. Do not key the radio or talk on it for any other reason then to check the SWR and tune the antenna. If you have the manual that came with your cobra 29, there is a section that explains how to check the SWR. And the manual for the antenna, it will explain how to adjust it.

If not, here is how to do it.........

How to check the SWR on a Cobra 29

Step 1. Find out what your current SWR is on the center of the band.

  1. Turn the radio to channel 20.
  2. Set the S/RF SWR CAL switch to CAL.
  3. Turn the CAL knob all the way counter clockwise.
  4. Key the radio. Do not talk into the mic.
  5. While holding the mic key, turn the CAL knob to the right until the needle reaches the CAL mark on the top right of the meter.
  6. Now flip the S/RF SWR CAL switch to SWR while still holding the key on the mic.
The needle should fall. Where ever the needle is while holding the key is your SWR reading on channel 20. It should be as low as possible. If its a reading of 2, then its not gonna kill the radio but is border line. Any higher and its bad. Using the radio like this will damage the final output transistor. If its less then 2 this is better. You want it to be less then 1.5 or better.

The ANT light may come on with an SWR of 2. running the radio with an SWR of 2 shouldn't hurt the radio, but I don't like to mess around. Get it as low as possible.

How to adjust the antenna for SWR

The length of your antenna will change your SWR. SWR is basically how much RF energy is not leaving the antenna and getting reflected back into the radio. That's why it hurts the radio when its high. An antenna has to be the right length, matching the length of the radio waves in order for it to radiate all of the RF energy out of the antenna.

Most antennas have a way of lengthening or shortening the antenna. If its a mag mount antenna with a metal whip, there is probably a set screw that when loosened, will allow you to raise or lower the whip. If its a fiberglass antenna, under the rubber cap at the top is how you raise or lower the antenna.

Figuring out if your antenna is too long, or too short

Here is how to know weather or not you have to lengthen or shorten your antenna.

  1. Take an SWR reading as explained in the first step on channel 1. Write down the SWR for reference.
  2. Take another SWR reading on channel 40. Again write it down for reference.
Now if the SWR is higher on channel 1 then on channel 40, its too short. You need to make it longer.

If the SWR is higher on channel 40 then channel 1, then the antenna is too long. You need to shorten it.


Make small adjust ments about an 1/8th to a 1/4th inch at a time. each time checking the difference between channel 1 and 40.

You will know when you are a good match when there is little to no difference between channel 1 and 40's SWR. Once you are satisfied that the difference between 1 and 40 is about the same, and much lower, then turn the radio back to channel 20 and take an SWR reading.

You will now find that the SWR on channel 20 is really low. Most likely under 1.5 or better, Almost nothing on the meter.


Here is a Meter Key, so you know what you are looking at.
2d03348.jpg

Oct 11, 2010 | Cobra 29 LTD CB Radio

1 Answer

Every time i key up my mic the ant light comes on i have a cobra 29 and its a new cable and it was working fine for about the last 4 months and just started acting up on me what could be the problem with...


Soiunds as if there is some sortof ant problem
If you can hook a dummy load to the ant. connector on rear of the radio that will definately tell you
.

Sep 29, 2010 | Cobra 29 LTD CB Radio

1 Answer

29 LTD CB Radio: all i have is a new 29ltd with a will 2000 ant whe...


Well, i,am wondering.what kind a problem you having.......all looks good to me....just key the mic.....and say Hi ....enjoy...........

May 18, 2010 | Cobra 29 LTD CB Radio

2 Answers

When i key up the mike the tx/rx light and the ant


your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

1 Answer

The ant light and the other light light up red when i key the kic


the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Sep 14, 2009 | Cobra 29 LTD CB Radio

1 Answer

RED TX and ANT light, Cobra 29


Hi,

Your post of 2 lights; 1 is to indicate that you are transmitting when keying the mic is normal. The 2nd indicating an antenna warning (or SWR) should be corrected. You are right in starting with the coaxial cable which of course would include the PL259 connector. Verify that there are no breaks, over-bended loop, exposed ground/shield and that the solder of the center wire as well as the braided shield/ground is in order.

If it is a mobile setup, further verify that the antenna mount (except when magnetic) is properly grounded to the body of the vehicle and free from rust/corrosion. In some instances, it is the antenna itself that need checking or even possibly replacement.

Alternately, if the needle doesn't swing to the right side of the meter when the mic is keyed, it is possible that your finals (2SC1306) needs replacement.

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

Good luck and kind regards.

Dec 06, 2007 | Cobra 29 WX NW ST 40-Channels Base CB...

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