Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148gtl upgrade to band D and E ? - Cobra 148 GTL 120-Channels Base CB Radio

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  • Cobra Master
  • 1,847 Answers

You cannot do it . take it to a tech .

Posted on Feb 23, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Shuttle83
  • 1139 Answers

SOURCE: cobra 148GTL

Hello k007,

It sounds like you may have damaged the RF power amplifier stage of the CB. Since you were adjusting the antenna characteristics. Did you have a SWR (Standing Wave Ratio) meter connected while you were tuning the unit? If you did you might have noticed the needle go past the 1.2 mark when you were adjusting the antenna or the unit itself. In any event I think that the RF power Amp is shot.

Thank you,
Shuttle83

Posted on Nov 27, 2007

  • 9 Answers

SOURCE: Cobra 148GTL Missing TX Modulation

The problem is most likely the audio ic . open the radio and see if the diode 44 is blown or see if you see anything that looks like it got hot around the plug area. if not contact me and i will buy it. is it an old or new 148 gtl.Read more

Posted on Dec 06, 2008

  • 773 Answers

SOURCE: 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.

Posted on May 05, 2009

  • 86 Answers

SOURCE: I have a cobra 148gtl that has 26 meg and high

VR10,,tuneL37,L38 you can remove TR24 it's for
modulation,but it may over modulat if removed.
that will get you started.

Posted on Oct 18, 2009

anymhz
  • 500 Answers

SOURCE: where can i find a service manual for a cobra

Contact the cb shop @ 317 426 9649 They have copies of manuals for pdf type formats..

Posted on Aug 18, 2010

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1 Answer

My radio 148gtl d has low modulation


The Modulation adjustment is VR5, or you can cut D9, though I do not recommend completely disabling the AMC circuit. If VR5 does not have enough range, lift the banded end of D9 & solder a 1K-ohm resistor in series with the diode, then adjust for 100% modulation or to where the AMC circuit just starts to limit modulation.

Mar 04, 2014 | Cobra 148GTL AM/Single Sideband CB Radio -...

1 Answer

My cobra 148gtl has low modulation on sideband. What can I do to correct this.


Check the Mic. Sideband you can talk up. ie the louder you are the more mod.

Jan 24, 2014 | Cobra 148GTL AM/Single Sideband CB Radio -...

2 Answers

Need Cobra 148GTL with Cobra HG M75 pin-out color code


1audio. 1red
2shield. 2shield
3receive. 3blue
4switching. 4white
5transmit. 5black

Hope this helps

Jul 03, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Where can i find a service manual for a cobra 148gtl/ex citizens band radio?


Contact the cb shop @ 317 426 9649 They have copies of manuals for pdf type formats..

Aug 15, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I have a cobra 148gtl that has 26 meg and high


VR10,,tuneL37,L38 you can remove TR24 it's for
modulation,but it may over modulat if removed.
that will get you started.

Aug 27, 2009 | Cobra 148 GTL 120-Channels Base 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

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