Question about Cobra 29 LTD CB Radio

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Does the rx/tx green light stay on all the time? Cobra 29LTD

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Rgreen light is the reciver light yes it stays on re is when your radio is transmitting .

Posted on May 12, 2010

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Yes the light will stay on and change when you key the mic

Posted on May 09, 2010

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1 Answer

I have a none amplified D104 G stand it came off my TRAM D201 IT has a two center leeds that's shielded I know this will work on my cobra 29LTD but I don't get it please help


First, you have to replace the cable as you will need a minimum of 4 wires, 2 of them for the transmit and receive switching, and a shielded cable for the audio. It would be nice to have another as the common for the TX/RX switching but the shield is commonly used for this.

You will need to re-wire the switch in the candlestick to allow switching from RX to TX.

Google "D104 to cobra 29 mic wiring" and you will find many hits for this.
Your microphone was not intended to work with this style of radio. To save a buck, the CB manufacturers removed a 50 cent relay to do the transmit/receive switching. You can see what happens when you remove the microphone when you are listening to the Cobra. It'll stop producing any sound. This won't happen with the Tram,

Also, you may have problems with the microphone as it is high impedance as indicated by no transformer or preamp in the base of the microphone. This may be a problem as the Cobra has a relatively low impedance input.

Aug 07, 2016 | Cobra Radio Communications

1 Answer

148 gtl cobra cb radio and the rx/tx light stay on


This sounds like a problem with the MB3756 Regulator IC. It controls voltage regulation and TX/RX Switching. It is a common failure in these radios. Check voltages with schematic that can be found at
CB Tricks Home Page

Sep 02, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

Red lights come on tx n rx and antenna come on when I key up the cb radio and the swr meter doesn't move


if a mod has been done to the cobra 29 (all 29,s)the light will come on just find vr6 audio the radio as it comes on adjust vr6 untill it goes away,,,,always trust your watt meter(s.w.r scale)over the flashing light its really easy to do it beats paying a shop $10-$15

Jan 13, 2013 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29LTD Classic RX seems to go off frequency. Transmit is fine, but can't receive on same channel. i.e. TX on Ch 11, but RX some other frequency. Was talking to my wife and suddenly, her signal was...


all functions of the radio are performed by the main IC 2816c . The frequency is controlled by this also and if it is blown you will loose your frequency and the problem that emits is in your statement.

Oct 23, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have expanded my 25 ltd and want a rx/tx fine tune possibly using the rf gain control?


look at a schematic of a 29ltd to do that.. the 25 does'nt have it in there easily.. the 29 can be fixed to change tx/rx freq. with the delta tune

Feb 11, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

I have a Cobra 29LTD serial number 43011339 that has no TX or RX. The radio powers up but the RX led is not on. TR 23, R105 and TR 21 get hot to the touch as soon as the radio is powered up. I replaced...


Hi,my name is John. you need to adjust both TR23 & TR21 to 8 volts.......then you should be OK.......good luck. Rate this solution on the four thumbs--up.thanks John.

Oct 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

Red RX/TX and red ANT light on my CB


Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Mar 11, 2010 | Cobra 29 LTD CB Radio

1 Answer

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

1 Answer

Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good


1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Jun 05, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29ltd classic : no rx / tx


Hi,

D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)

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

Good luck and kind regards.

Feb 04, 2008 | Radio Communications

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