Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My cobra 148gtl sometimes will transmit and after a few minutes when keyed up will not transmit

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1 Answer

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  • Cobra Master
  • 1,795 Answers

Try some canned air on the final to cool it down .If the radio comes on then you have the problem child.

Posted on Sep 01, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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Benimur
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SOURCE: cobra 148

Hi,

For most CB radios, some common components that fail and would cause a fuse to blow would be:
1. reverse protection diode located right after the power connector at the very rear of the board;
2. finals (2SC1306/7 or 2SC1969);
3. filter capacitor, 2200uF/16V;
4. audio amp IC located on the side of the chassis; and/or
5. 3 terminal voltage regulator (780X) or a zener diode.

Alternately, a wire (after the switch) might have been grounded.

Hope this be of some help/idea. Post back how things turned up or should you need further information.

Good luck and kind regards.

Posted on Nov 04, 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

  • 1 Answer

SOURCE: 148GTL Cobra (no tx)

the dx 2527 has a fine ransmitter. it is choked out by the factory to pass FCC reg's. With about $4.00 in parts from the rat shack you can really make it talk. my personal 2527 dead keys around 3 watts with around 45 50 watts on rms with bird meter around 60 with crappy dosey.

Posted on Jan 22, 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

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

1 Answer

No transmit on 148gtl


First is check to see if SSB transmits or not==if it does the AM regulator on side wall of radio is bad.

Second with a meter and no power on--test the driver and final for shorts or open.

If one is bad replace both.

let me know what you find.

Apr 29, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I have a cobra 148gtl it will not recive or transmit but it does light up


hello from my experience of this problem you will have to replace the audio and pa trancisters

Jan 07, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

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My new Astatic Road Devil will not transmit audio on my Cobra 2000, it came with a 4pin plug and I put on a 5pin 1 white(audio) 2 shield 3 black(recieve) 4 blue(common) 5 red (transmit) yellow(n/a)


recheck that you have the wiring correct. you will need the wiring of the cobra 2000/148gtl/grantxl... can't remember the pin outs. what you have posted is not the correct one??? i think.

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I have a phillipinnes made 148gtl at first transmit would wok intermittantly ,now if you let radio warm up it might work one time , recieve is ok i suspect it is not sending a carrier


there are 2 finals in this radio. one for side band, and one for AM. So if it works okay on side band, and not at all for AM, then the final for the AM side is bad. Replace it.

Nov 16, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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No recieve on virgin cobra 142 gtl,


seems to me that the audio ic of the cobra 148gtl brokedue sudden change of voltage from power suplly or flactuation. ta7222p

Jun 07, 2008 | Radio Communications

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