Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl-st wont transmit but receives great

Receives great on am and usb/lsb but will not transmit on any mode and also no pa output. needle on output meter stays on o when attempting to transmit.

Posted by don strasheim on

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1 Answer

Rommel Cana

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Check first your microphone

• check if TX is engaging when PTT is pushed.


• check for continuity ( mic and cable )



If you have not done these steps,

try it first, or borrow other compatible mic for Cobra 148GTL

from your friends on air.

Posted on Aug 02, 2012

  • don strasheim Aug 04, 2012

    mike tested good on another radio

  • Rommel Cana
    Rommel Cana Aug 05, 2012

    then there are component failure, inside the unit, could be transistor, resistor or both check tx circuits

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2 Related Answers

wood butcher

  • 32 Answers

SOURCE: cobra 148 gtl b no recieve

make sure that the rf gain is turned up all the way.Check diodes D-12&D-13.

Posted on Feb 02, 2009

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wcrave

  • 19 Answers

SOURCE: Cobra 148 GTL ST. No AM transmit audio. Carrier is

Could be TR41 or TR42. I would try TR41 first.

Posted on Jun 29, 2011

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1 Answer

I have an cobra 148 gtl no transmit


If theres no carrier its either the finals or driver. If theres no audio its the white wire in the plug that screws into the radio..its either broke or most likely come unsoldered. It keys but no audio.

Mar 05, 2015 | Cobra Radio Communications

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Cobra 148 gtl d has problem transmiting with covers off. trying to tune radio up. was thinking I need to ground the chasis


I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.

Oct 25, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My cobra 148 work well on am but not on lsb


clipping the limiter should not have prevented tx on sideband are u sure u didn't do something more accidently. r 131 is the correct limiter for the 148. just out of curiosity what year 148 is it?

Jun 15, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive issues


The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I dont really have a problem


THE ACTUAL FREQUENCY IS THE SAME THE ONLY FREQUENCY THAT CHANGES IN THE RADIO IS THE CRYSTAL OSCOLATOR. IT SHIFTS FREQUENCY UP OR DOWN IN THE SIDE BAND MODES. SO YOU WILL TRANSMIT
AT 27.285 ON CHANNEL 19 OR 27.335 CH 35 AND SO ON.

Mar 11, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl new model


Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.

Oct 07, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl


Open the radio up and find the L22 Can/Pot. It's the one with the wire soldered on top. With both fine and coarse Claifier/Voice Locks in the 12 O'Clock positions, confirm, then listen for someone that is on the correct frequency and turn this pot (small ferrite core inside) with a small plastic preferred screwdriver, until they sound clear. Do this for USB as well except, the Can/Pot is L59. Don't adjust the VR5 (transmit) unless you need to.

Oct 06, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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