Question about Cobra 29 LTD CB Radio

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Low output Low audio when hot

Cobra 29 classic can only get two watts output. Tweeted on L13 and improvement. SWR is 1.3 to 1. Also...when the radio get hot and the noise limiter is on the audio level drops to almost nothing. If I turn off the limiter....I have plenty of audio. Any sugestions

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Hi, my name is John. Did you set your milliamps on your pre- driver and the other final? Let me know. Rate this solution on the four thumbs-up.....John

Posted on Sep 08, 2010


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2 Answers

Got a cobra 29 ltd classic dead keys 10 watts and swings back to 6 watts on an external meter any answers

Hi you have to make sure your antenna has 1:1 SWR reading improper use of antennas deplete the Effective radiating Power of Transmitting equipment such as the CB radio.

Mar 15, 2016 | Cobra Radio Communications

1 Answer

Adjusting the wattage output cobra 29 classic

It was probably set low so the person you bought it from could run a little box but as long as you have a watt meter you should be able to turn it up to about 5 watts.

Jan 24, 2014 | Cobra Radio Communications

1 Answer

I have a cobra 29 ltd classic good swr, good watt output, but no audio output and the microphone works fine and I have no problems with another radio on this system can you help.

could be a Vr inside is turned wrong way. If you turn it one way the audio is turned up. If you turn it other way you turn the audio off.. Its sometimes chrome with screwdriver slot in middle or a white turn knob with 4 way screwdriver head. Sometimes its reverse. so if you think turning clockwise makes it go 100% it may be taking it back down to 20% instead. It may be counterclockwise to get Audio loud. Different radios have counter or clockwise positions different. Experiment.. turn up mic gain all the way up to Max on radio and spread coils inside 1/8 inch apart.

Mar 29, 2013 | Radio Communications

2 Answers

I hav a 29ltd classic cobra cb radio i had it tweaked first did not notice a diference in transmission but reception is still normal then i installed a rxf 75 amp and my reception decreased and everyone...

Receive amps on a Linear's can cause this issue---the key question is what is the dead key wattage in the radio adjusted to?

You hook an amp up--jumper cable length between amp and radio is critical---the power output of radio is critical--put 4 watts into a 75 watt amp and it will be over driven-- The proper way here is with radio and amp hooked to a big dummy load adjust the radio wattage output so the radio keys up the amp and gives maximum forward swing on a watt meter. (in some cases as little as 1 watt output from radio)

Some people call this matching the radio to the amp---The antenna system then becomes involved--further adjustment of the radio with the antenna system connected will be needed (power output) for the amp to work well.

If just a 29 LTD lowest Swr should be on channel 20.

Note: also important to check the swr with the Amp on as if power is being reflected back at radio when amp is on more needs to be done.


Apr 21, 2012 | Cobra 29 LTD CB Radio

1 Answer

Just bought a workman 3000 to 7500 watt cb antenna, ever heard of it?? Im going to hook it up at work monday, got a cobra 29 ltd + or - 30 watt output. 9' coax. the antenna has 8" of swr adjustment... for...

cobra 29 has a 12 watt final, doubt you will be doing 30 watts. 25 if your lucky. Use 18 feet of coax, you will get better broad band.

If the antenna comes with the whip in it already, its been tuned at the factory and you shouldn't change it yet.

If not, half way is okay. It still needs to be tuned on a meter. either the one in the radio or an inline.

Mar 06, 2010 | Cobra 29 LTD CB Radio

3 Answers

What would be a good size linear to add to a cobar 29 that has been peek and tuned and echo board put in it

for a mobile or home base setup 100 - 250 watts is enough on all modes am / fm / ssb / cw, 1000w or 1 kw would be a overkill. what transmitters rely on is a tuned antenna and swr near 1:1 or 1:1.5, achieving a good tuned antenna will give you a clean output and good signal.

Jul 17, 2009 | Cobra 29 LTD CB Radio

2 Answers

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.

Apr 22, 2009 | Cobra 29 LTD CB Radio

2 Answers

Cobra 29 nw ltd classic

Hello candy_72_99,

Hello candy_72_99,

If I am correct what you are saying is that your radio has poor modulation? ok. First I need you to run two tests for me.

1) Power output Test: connect a power meter to the antenna jack and the other connector of the meter to the antenna, Key up the mic and record the power reading is should be 4W PEP or 36.02dbm

2) Then I want you to take an oscilloscope and put a 1khz tone in to the mic while measuring the RF output at 100% modulation the wave form should not clip.

If these two test are good then your modulation is ok. What I believe you are asking for is more power or better power efficiency.

Try to tune your antenna for 1:1.0 or 1:1.2 SWR with a SWR meter this should deliver the full power to your antenna.

I hope this helps

Thank you,


Nov 04, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

4 Answers

Cobra 29 ANT light

I believe it to be feedback but be aware of your Standing wave ratio because using a linear amp radiates signal to the point that it could cause that light to come on. There is a problem if the radiated signal is feeding back into the amp a a higher level that it can withstand over time.

Sep 08, 2007 | Cobra 29 LTD CB Radio

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