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 : [email protected]

Posted on Sep 10, 2007

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1 Answer

My swr meter will not calibrate. I put it on fwd, Key the mike, put it on ref,and it pegs the needle. why?


Antenna may have a dead short or is open, there may be water in the cable, SWR is beyond the scale of the SWR meter.
Check all connections, make sure you have the radio and the antenna well grounded. if possible disconnect both ends of the coax cable and test cable with a ohm meter for a short or open.
Test the SWR meter on a known good antenna and cable if possible.

Oct 16, 2014 | Radio Communications

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

3 Answers

Dont know how to use the swr meter on my radio


With radio turned on

1. Switch the first switch (S/RF SWR CAL) to CAL setting
2. Key mic up &
3. Turn SWR CAL knob while still keying mic until the needle is on the red CAL arrow at the far end of the meter scale. Unkey mic.
4. Switch the first switch back to SWR setting.
5. Key mic up again and record SWR reading and adjust as needed.
6. When done adjusting put switch back in the S/RF setting for normal operation.

Do not flip the switch with the mic keyed up.

Jan 19, 2010 | Cobra 29 LTD CB Radio

3 Answers

My radio is recieving a signal from other cber's but i don't think they can hear me


Go on a channel where people are talking and when some one stops transmitting key up and say, "breaker breaker, can I have a radio check please?"

that is how you call for a radio check to see if people can hear you.

breaker breaker, or break break means kind of like, "excuse me, I would like to talk on the channel please."

If they hear you the will most likey say, "its working." or "Checks in the mail." You can then ask them after that how the radio sounds.

Also make sure your mic gain is up.

If you get no response then there may be another problem. Make sure you followed the instructions that came with the radio on how to tune your antenna for best SWR. This is important.

Dec 08, 2009 | Cobra 19 DX IV CB Radio

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

When I key the mic the radio blinks out and then comes back on


This can be due to one of several problems. Insufficient sized wires to the power source or a high SWR (standing wave ratio) between transmitter and antenna. The first is probably not a problem unless connected to an RF amplifier to boost output wattage. A high SWR however, is a more likely culprit. SWR is a ratio of power out of the transmitter to power that is reflected back from the antenna. Ideal theoretical ratio or "match" is 1:1. Real life is more like 1.1:1 (one point one to one). Most transmitters are perfectly happy with a match (or mismatch as the case may be) of 1.5:1 or even 2:1. Beyond this is asking for trouble. A mismatched antenna system can cause the failure of the output final transistors.

Matching or lowering the SWR of a radio to an antenna system requires that an SWR meter be installed between the antenna coax or cable and the transmitter's antenna connection point. There are two types of meters - dual needle and single needle. The dual type is more expensive, but easier to work. The meter must be capable of working on the frequency it is to used on. This means if it is marked as a 400 - 512 Mhz or UHF type, it will not be accurate on 27 Mhz or HF.

Once the meter has been installed, transmit at half power (or at least the amount needed by the meter) on the highest frequency and take readings. Do the same at the lowest and a middle frequency and record findings. Physically adjust the length of the antenna whip - by no more than 1/4" inch (for 27MHz CB frequencies) and check again. After a few tries, you should begin to see how shortening or lengthening the whip changes the SWR of the system. Once set correctly, the middle frequency will have the lowest SWR value while the lowest and highest frequencies will have equal higher SWR values. It would go something like this: Ch1 = 1.6:1 Ch 20 = 1.2:1 Ch40= 1.6:1 Of course, if Ch1 = 1.7:1 and Ch 40 = 1.6:1 that would be fine, too.

Double check everything once more at full power, so that you know the transmitter won't be damaged under full power conditions. Make any last adjustments and lock everything in place.

Aug 21, 2009 | Radio Communications

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

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