Question about Cobra 29 LTD CB Radio

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No transmitt,Key up and meter pegs out.

The meter pegs out when you key up but not getting response when doing a radio check. Also needle doesnot swing when talking into microphone. Have put mic on my cobra 25NW and it works fine. Have cracked the case and all soldered connections on mic jack are fine. Any ideas on where to start looking would be greatly appreciated.

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The problem is the audio output chip. the number of this chip is TA7222AP, have this chip replaced and it will solve your problem. If you need futher info contact me at :

Posted on Sep 10, 2007


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1 Answer

S/rf is too high on transmit on my cobra 29 ltd bt

no matter what s/rf you are looking at it should not key much beyond an s-9 . vr 3 controls the meter. Key the mic and adjust it to s-9 then check you modulation.If you still think you need more then adjust vr 4 .

Jan 07, 2012 | Cobra 29 LTD CB Radio

1 Answer

Reception is fine, cannot transmit. checked swr's and all below 2. how to check out transmission modulation?

To see if your radio is "modulating" you need to do one, or both of these things. The first and easiest is to look at the RF/Signal meter in your radio. If you see forward movement of the needle then you know the radio is modulating the carrier. NOW, the second and best way to see if the radio is modulating is to go out to your local Truck Stop and purcase a Power/SWR meter. They generally run about $30 bucks. You will also need a short coax jumper (at least 3 feet, no more than 6 feet) to link the radio/meter/antenna. By the way, they should go in that order. The meter will be clearly marked as to how to hook it up and it will come with instructions.
To check forward modulation, the meter should be in Power mode (not SWR mode) with the power scale switch set to 10 watts. You then key the microphone. You should see a carrier (dead key) of about 4 watts. To check for proper modulation, you should then speak into the mic at a normal level. You might try saying AAAAUUUDDDIIIOOO (audio). If the radio is working properly the needle should rise off of 4 watts and swing forward to around 8-10 watts....give or take a few, depending on weather or not the radio has been modified (peaked and tuned). If you see forward movement on the meter, you know it is working properly.
If you do see that the radio is modulating properly but you cant seem to contact anyone on the air waves, then you need to start looking at your antenna setup. I will not go to deep into this subject because it is so extensive. The antenna system is VERY important. you said you checked SWR and it is below 2. This is a little high...but acceptable. You should really try to get your SWR as close to 1.0 : 1 as you possibly can. Hope this helped. Lost Jeep, Athens GA, 10-7 !!!

Feb 18, 2011 | Cobra 29 NW CB Radio

1 Answer

Galaxy saturn tubro 100 watt power is sticking after key up.

Not sure what you mean completely. If you mean, when you key up, it keys at 100 watts and stays, then this is probably not a problem.

If it doesn't swing, it is either the watt meter you are using, or you have the power up too high, or both.

I usually key my saturn turbo around 80 watts. You have to be careful with these radios. they get hot fast and when they do, they get whacky. Make sure you have a PC fan plowing on the heat sink on the back.

The higher the dead key, the less swing you will see.

Now as for the watt meter....

There are a few types of meters out there. The 2 most common are ones that read AVG, or average watts, or PEP or Peak envelope power, which in short terms is your Peak wattage. Some meters do both.

An AVG meter will not read peak wattage, or swing. So if you meter is an AVG meter, or is set to AVG, then it will not read swing, and will show you your dead key, and that's it. Some times the needle will move a little, but it is not showing your true swing.

All in all a PEP meter is a loose representation any way, because you really cannot get an accurate reading when there is modulation. But it's close enough. You would need a spectrum analyzer to really see what you are putting out with modulation. AVG with no modulation is a more accurate reading however you cannot see swing.

Now PEP while transmitting in SSB with modulation, would be accurate. Just not AM, but like I said, its close enough and is what every one goes by.

I don't know if your Saturn turbo has been modded or peaked and tuned but, you should see a max of about 170 to 200 watts swing on that radio if its been done right. But you will need a PEP reading meter to see that.

I wouldn't run it past 80 watt dead key for long. With that radio you should really only run what you need. For instance, when I am using mine, I start at around 70--80 watts, and do a check, and if it's not strong enough I bring it up a little, until the audio sounds good to who I am talking too.

Like I said, you have to keep it from getting too hot.

Nov 04, 2010 | Radio Communications

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do

TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

No audio meter needle swings on another radio

is the radio working? sometimes the meter just dies that will not effect yor radio

May 30, 2009 | Connex 3300 240-Channels Base CB Radio

1 Answer

Low output power

On the meter you are using, does it mesure Average power or peak envelope power?

This is very important to know when you are measuring.

AVG measures basically your dead key. It usually will very little if at all.

PEP measures your peak output, or swing. Modulation.

So even if you have a radio that has been peaked, on a meter that reads AVG, it will still read around 3 to 4 watts. And, if it has a swing kit in it, it will read even less. A swing kit lowers the dead key it increase modulation. Higher PEP.

For example. I peaked my cobra 29 and it does some where around 22 -25 watts PEP. I have variable power in it as well, but usually run the dead key at 2 watts because I have a linear. The Radio alone, when mesureing on PEP with key up at 2 watts, and then when you talk, swings to about 22 -25 watts.

If I flip the meter to AVG, it stays at 2 watts even with talking.

If you have one of those cheap pyramid meters, etc, they usually only read AVG.

Get a meter from radioshack. They have a fairly decent radio for the money. It reads both PEP and AVG and has SWR as well.

If the radio has been peaked and it has a swing mod, it will most likely be swinging to some where in the 20 watt range.

On a side note. According to FCC regulations, a CB radio is only allowed to transmit with 4 watts of final power. Most times the manufacturer will have it a hair under so that they are leagal.

Basically it is illegal to use a CB that puts out more then 4 Watts.

But its a free for all these days. There is no more funding to the FCC for monitoring CB radio, so they do not want anything to do with it. As long as you don't over do it, have over 50000 watts and terrorize a small community with RF, you can do what you want.

Now a days most cb radio's bought have already been peaked if you got it from a cb shop, or off a website that does it.

Apr 21, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 29 ltd classic needle doesn't work correctly

Don't worry about the meter in the radio. They are only close to actual reading any way. Just get an external meter. you are better off in the long run, and you don't have to mess with anything inside the radio if you don't know what your doing.

If you must have the meter working correctly, then take it to a truck stop CB shop, or any other cb shop and have it aligned. It should cost about $30. There is equipment needed to align a radio properly and the cost for it far exceeds what an external meter, or having a cb shop align the radio.

Mar 10, 2009 | Cobra 29 LTD CB Radio

1 Answer

I can hear people talking, but they can't hear me, or they say I sound like an alien

Check to see if the meter needle is swinging backwards when you key up. If it does your final may be bad. If the needle goes forward and others say they see your keying up but no sound your audio chip may be bad; especially if you have tried so many mics and antennas. If your radio has a swr warning light and it comes on this could extremely limit your range and others may not hear you and contiued use will damage your radio. Good luck!!!

Jul 26, 2008 | Cobra 29 LTD CB Radio

1 Answer

When i talked no one can hear me but it move move the meter.

This may be a simple and very basic problem with all Cobra models. Honestly I wouldn't ever choose a Cobra, they're cheap radios. Instead buy a Galaxy or Uniden. But have you tried the Mic Gain? If not, turn the Mic Gain knob fully clock-wise and try asking for a radio check, if this doesn't solve it, you also might want to check the microphone's connecting ports, the connecting ports may be damaged or corrupted, if so, you can replace them by buying a new connecting port. If this doesn't work, your transmitter may be damaged or corrupted, this can be fixed, but it is expensive, you're better off getting a new radio. And don't forget, some truckers are dipshits (no offense) and ignore a lot of people.

Jun 30, 2008 | Cobra 29 LTD CB Radio

2 Answers

Uniden pc68xl

Since this is illegal to do I can't instruct on this matter, but you might do a search on cb sam website. good luck
NC Electronic
Mills, Wyoming

Nov 08, 2007 | Uniden PC68XL (40 Channels) 2-Way Radio

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