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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Re: No transmitt,Key up and meter pegs out.

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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I run a cobra 29ltd classic with a wilson 1000 antenna with ground plains. I also have a midland swr meter model 23-126 in line. How do i use this meter

Don't really know, but its probably a signal strength meter so you can more accurately tune in the stations.

Mar 25, 2015 | Cobra CB Radios

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 | CB Radios

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

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

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 | CB Radios

1 Answer

Galaxy 2547 Base Radio

Its Possible it just needs to be re calibrated. Are you also using an external meter to check your output. If not get an inline meter to verify that in actuality your system is fine regardless what the internal meter is saying.......Hope this helps.......

Mar 20, 2009 | Galaxy Radios DX-2517 CB Radio

2 Answers

148GTL Cobra (no tx)

Bad transmitter. You can:
1) take it to a repair shop
2) get a new radio
3) repair the transmitter with a stock replacement transmitter
4) check the inside of the radio, make sure everything is where it's supposed to be
5) make sure that you are using the correct power supply for the unit

If the problem is too extensive and you consider getting a new radio similar to the 148GTL, try the Galaxy DX 2527. It's a BIG radio. But it's production was discontinued. If you can't find a Galaxy DX 2527, try a Galaxy DX 2517, it's similar to the DX 2527, but with less features, but has great sound, I get nothing but good comments when I talk on it. The DX 2527 has an okay transmitter, it doesn't sound all too good by itself, so that's why you have the echo and robot voice changer options.

Hope this helps!

Oct 12, 2008 | Cobra 148 GTL 120-Channels Base 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

3 Answers

Connex 3300hp radio


Based on your post/description:

1. how do i set the swr
Normally SWR are calibrated on your operating channel (where you usually stand-by). This is to maximize transmit power and receive sensitivity. To set SWR, switch to channel of your choice, switch SWR control to CAL, key or press PTT, while pressing PTT rotate ADJ knob until max deflection of needle on meter, release mic, switch control to SWR, key/press PTT, needle reading/deflection is SWR for that channel.

I would suspect that your SWR will vary from your current 1.4. This is because you have too big excursion of channels (240 channels).

2.reading a 1.4
This reading is good enough and should do. However as earlier stated, you seem to have 240 channels which would mean that your radio + antenna moves in a wide bandwidth and since the antenna tuning is affected by frequency, your SWR will also be affected by channel.

Best if you can further lower it down.

3. some cb cant get me
This is because the standard CB radio is only 40 channels. The next would be a 80 channel and then 120 channels.

4. is it my radio
Yes, you have a wide coverage radio almost an extended 10 meter rig.

5. do i have to set my radio on high or low to set my swr
I will assume you are referring to power output, set it to HIGH when doing SWR calibration

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

Good luck and kind regards.

Nov 08, 2007 | Connex 3300 240-Channels Base CB Radio

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