Question about Cobra 29 LTD CB Radio

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Have a COBRA 29 LTD ST that has the exact same problem

I can't hear anyone and noone can hear me. I drive dump truck and we use channel 5 at the quarry and ashpalt plant. The SWR cal was set by one of the other drivers as an attempt to help me and that didn't work, Any suggestions???

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  • jmen37 Jun 28, 2009

    I tried using a new antenna and a new mount with new coax wire and the problem lasted all week. I gave up on it after seeing that other people were having the same problem as I with this model series.



    I borrowed money and went to radio shack and bought a cheap 59 dollar cb and I know that works. Thanks for asking for the follow up though.

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There are so many things that it could be so let's try some substitutions. Since it doesn't receive or transmit, it sounds like either no power or a bad antenna "system". Take your unit and temporally try it on someone else’s truck that has a working antenna system. Then take someone’s working radio and temporally try it on your truck. This should produce an "aha" moment. If not tell me what happened.

Posted on Jun 27, 2009

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1 Answer

The wiring came off and don't know howe they go by color it'got5 places to salder wires are r/b/or/b


If your asking about a Cobra radio then these links will have the pin-outs plus wiring color code for different mic's.
I had to guess what you was asking for as your question was kinda vague. And a Cobra 29 is a 4 pin mike, not 5 pin.
The 148 - 142 were 5 pin. I'll include it also.
http://www.cbtricks.com/radios/cobra/148gtl/index.htm Cobra 29LTD ST 29WX ST

Aug 13, 2015 | Cobra 29 LTD CB Radio

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Just installed a cobra c.b.


where did you buy it?if you bought it new send it back and let them fix it.

Aug 19, 2012 | Cobra 29 LTD ST - CB radio - 40-channel -...

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How can I fix my cobra 29 nw ltd classic? Everything works but the channel does not display and all I hear is static.


Check TR22 which is a 2sc1957 transistor mounted on side of case near heatsink for driver and final, left rear with speaker cover removed. Make sure the legs are not contacting case. Then check resistors R115, R116, R117 for open circuit and C133 for continuity.

I figure that 2sc1957 transistor is shorting to case or failed. A 2sc2314 is a sub for this transistor.

Oct 01, 2011 | Cobra 29 WX NW ST 40-Channels Base CB...

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I have a Cobra 21- 23 channel CB and the wires pulled out of the plug. The mike wire has red,yellow black,blue,whiteand a ground. My plug has only four prongs to solder to. What four colors do I use?


Hello there
Here is the diagram for you
Cobra 29LTD, 29LTD ST, 29WX ST
Documentation Project
CBTricks.com

TIPS:
You need to have Acrobat Reader version 5 or newer installed to view the files with pdf_1.gif icon.
If the files with jpg.gif or gif.gif icon will not display see the Site FAQ for help on printing, viewing and using this information.
25ltd_st_sm.jpg
Click Picture to See Close-up
cobra_29ltd_st_29wx_st_side.gif 29LTD ST Owners Manual pdf_1.gif
29WX ST Owners Manual pdf_1.gif
DIAGRAMS
29LTD ST Schematic Diagram pdf_1.gif
29LTD ST Schematic Diagram gif.gif
29WX ST Schematic Diagram pdf_1.gif
WX Schematic Diagram pdf_1.gif
29LTD, 29LTD ST, 29WX ST Factory Service Manual pdf_1.gif
Page 1 to 11
Page 12 to 34
29LTD Factory Service Manual pdf_1.gif
29LTD
29LTD Schematic Diagram pdf_1.gif
29LTD Schematic Diagram jpg.gif
29 LTD Classic Schematic Diagram pdf_1.gif(Courtesy of Rick Jackson)



Mic Wiring
Stock
1- Shield
2- Audio
3- Transmit
4- Receive
Astatic (4 wire)
1- Shield
2- White
3- Red
4- Black

Astatic (6 wire)
1- Shield & Blue
2- White
3- Red
4- Black
Yellow NC
Daiwa EM-500
Cobra CA Series

1- Shield & Black
2- Red
3- White
4- Blue
Galaxy DC-521S (4 wire)
1- Shield
2- Yellow
3- Red
4- Black
Galaxy CB-660EI
1- Shield & Black
2- White
3- Red
4- Blue
Sadelta
1- Shield
2- White
3- Brown
4- Green
Turner
1- Shield & Red
2- White
3- Blue
4- Black
Yellow NC

Nov 17, 2009 | Cobra 29 LTD CB Radio

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Cobra 29


it's all about R55 and L14 and etc.

Jan 11, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

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I can hear others but when i talk noone hears me


Try switching a different mic, sometimes the transmitting wire comes loose inside the connector. If you are handy enough, you can even unscrew those two tiny screws on the end of the mic cord and see if a wire is loose and if so, solder it back into place.

Oct 04, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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Codra 29 nw ltd classic


For the money,the Cobra 29 nw/st is just as good if not better than a Galaxy. Cobra is more durable by far. I have had 3 of these cobra's in the last 30 years. Only had to replace the last one because the tractor got hit by lightning.
Sure would not pay big money for a name.

Mar 19, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

29 help


hi, sounds like you have a problem with the SWR' S Probably too high. Tumbleweed01

Mar 12, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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