Question about Cobra 29 LTD CB Radio

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Transmitting hi i have a 29 ltd classic i have transmitting problems. the radio will key up and modulate but only for a short time, as it fades away. what do you think the problem is. i have been thinking a final transistor or the c112 capasitor

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It sound to me like it could be your finals, as its heating up its slowly cooking itself, but you my want to to check the c12 cap as if it is not emiting the correct voltages it could be over working your finals, or under driveing it.

Posted on Apr 30, 2008

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1 Answer

When it's dry, I can't transmit, but when my antennas get wet,transmission doubles, WHY????


Hi John:
Try checking where the antenna is connected to the cable.
It may be corroded and you're not getting continuity unless it is wet.

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I have had a Cobre 29 LTD Classic, a 29 NW LTD Classic and now a 29 LTD Chrome.It seems that the first two died because of possible bad antenna connections. I was able to calibrate the radios and adjust...


I see two possible problems. First, with a magnetic antenna it is difficult to get the proper ground for the antenna. Make sure the magnetic base is clean as well as where you place it. Second, try running your power lead DIRECTLY to the battery and not using the cigarette lighter. Hope it helps.
Tom

Feb 27, 2013 | Cobra 29 LTD CB Radio

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I have had a Cobre 29 LTD Classic, a 29 NW LTD Classic and now a 29 LTD Chrome.It seems that the first two died because of possible bad antenna connections. I was able to calibrate the radios and adjust...


HELLO STAN FIRST HAS THE RADIO BEEN PEAKED AND TUNED? SECOND IS THE INTERIOR LIGHT IN YOUR PICK UP RIGHT BELOW YOUR ANTENNA,IF SO YOU HAVE A PROBLEM BUT EASY FIX THE WIRING GOING TO THE LIGHT ACTS LIKE AN EXTRA ANTENNA CAUSING YOUR ANTENNA TO RESONATE TO YOUR RADIO CAUSING THE A W I LIGHT TO COME ON MOVE YOU ANTENNA BACK A LITTLE FUTHER AND SHOULD BE GOODif you want to get a bettter antenna get a willson 500 mag mount far better

Feb 27, 2013 | Cobra 29 LTD CB Radio

1 Answer

When the mike is keyed to TR my audio comes thru the speaker. Cobra 29 LTD Classic. Best Regards Jim


If your voice is coming through the speaker when you transmit, it means you have talkback installed. If you don't like it, take it to a reputable CB shop and ask them to remove it.

Aug 06, 2010 | Cobra 29 LTD CB Radio

1 Answer

29 ltd classic wont transmit


Hi,
Great radio when it works.
If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected.
If CB -is selected and still nothing - be sure you have a working mic. These wires are fragile and can break internally. One easy way to check is to borrow a cobra mic or even drop by a CB repair shop and ask them to do a mic check with the mic - it is free.

If you have a bad mic replace it and all should be well.
If your mic is good and it still doesn't transmit you will need to replace the finals in the unit. It is common that these burn out of you got too close to someone with too powerful a radio. The CB shop will need to look at it further and repairs should not be over about 40.00.

Good luck with your Cobra.

Mar 31, 2010 | Cobra 29 LTD CB Radio

1 Answer

Radio lights up, but no TX/RX.


Hi and welcome to FixYa,

Based on your description, a possible drift in the local oscillator.  Check the 10.24Mhz crystal filter and its local oscillator for output and consistency.

Good luck and thank you for asking FixYa.

Aug 24, 2009 | Cobra Radio Communications

2 Answers

No audio Transmit


Try a hand mic with the set, there may be a short within the radio.If not your problem is with the audio amp in the radio itself.Repair should be about $15.00.

Aug 07, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

Dec 20, 2008 | Cobra 29 LTD CB Radio

1 Answer

No receive cobra 29 ltd classic


Hi and welcome to FixYa,

Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.

Perhaps a schematic diagram may be of further help.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 18, 2008 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 NW LTD CLASSIC NIGHTWATCH


Dear RobertTx,

Sounds like you may have a leaky or shorted capacitor somewhere in the power circuits, or a defective transistor in the same circuits since it affects both the transmitter and receiver.
Common problems with receive and transmit intermittance can also be the antenna or its connections. The fact that it goes away if the radio is turned off, then on again after a short time points to something common in the power supply section. Unless you have test equipment and a working knowledge of electronics it will be difficult for you to troubleshoot on your own.

Jules

Oct 21, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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