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Cobra schematics no tx no rx

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Go to www.cbtricks.com look for radios ,schematics , etc.click on it the click on C . Go to cobra (dynascan) and click on that.Now look for your radio and click on it depending on what radio you have you should find what you need here.

Posted on Aug 13, 2014

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 29 help

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

Posted on Mar 16, 2008

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SOURCE: cobra 29 nw ltd won't transmit

Have you cracked the radio open yet?  check for loose connections etc.  get back to me if that doesnt yeild any results

Posted on Jan 22, 2009

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SOURCE: Cobra 200GTL: Clarifier affects TX

Unfortunately, most people look to unlock the clarifier in radio's it is locked in.

From what I understand it is possible to lock it in that radio, however I do not know it because I usually unlock it in my radio's.

I also did a search, and asked a few people I know who are also very good with radio's and they do not know either. The only thing I found was this, and you have to pay this shop to do it.

http://cobraworxshopz.com/12.html


Posted on Oct 03, 2009

Benimur
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SOURCE: MY COBRA 29 LTD CLASSIC WILL NOT TX BUT RX VERY

Hi and welcome to FixYa,

Initially, check the final and driver, TR14 and TR15 using a transistor tester or ohmmeter..

Postback results.

Good luck and thank you for asking FixYa.

Posted on Oct 30, 2009

  • 1274 Answers

SOURCE: 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...

Posted on Mar 12, 2010

Testimonial: "Thx the rx/tx light is supposed to turn red I found out. Still trying to get the antenna prob fixed though."

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1 Answer

Good day I have an cobra 148 Gtl tx and rx a working but no out put


It might not seem obvious but on many, if not all, current CB radios have separate wires coming from the microphone for RX and TX. It seems like the mic wire for TRANSMIT may be open. It is a common failure.

Feb 28, 2015 | Cobra 148GTL

1 Answer

Stuck on rx mode


Rx is an abbreviation for receive. (Tx is transmit) There are a variety of reasons a radio will be "stuck" in Rx:
1) Another radio in the group is stuck in transmit and you cannot reply if your radio is receiving the other radios transmission.
2) Your radio is programmed for Rx only.
3) Your radio has a Tx problem such as a bad mic, or something covering the mic opening.
4) Your battery is low or bad. It takes more energy to Tx than to Rx.

Best regards.

Feb 07, 2014 | Cobra LI3900-2DXVP (14 Channels) 2-Way...

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

1 Answer

Cobra 29 ltd c b radio no tx no rx


you will have to take it to a repair shop and let them fix it or buy another one .

Dec 08, 2012 | 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

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

Cobra 148GTL can't TX on USB


Its the cap that feeds the first transistor to the first of the finals. It is either shorted or burned out.

Or the audio IC. It could be putting just enough out on AM to seem like its working, and then not enough for side band.

look at the caps near the finals. Look for a burn one, or one that could be twisted, or shorted in any way.

May 01, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Tx: fine rx : no..


Your power output has blown, they are called your "finals" they can be replaced quite cheaply.

Mar 26, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

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