Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148 gtl Low / No receive audio

The radio has good tx audio and pa audio, so the audio chip is working. I can create audio by do a "finger resitance" across the pcb. any ides where to look? everything on the radio is good except rx audio. Even took anther 148 and jumpered between the red wires on vloume, the radio would create sound from the other radio. RX does work, needle moves and you can pick up some sound by "fingering the pcb..... cobra148 gtl malaysia pcb 1995 build

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No audio out / low audio out....This is a constant problem with the COBRA 148 gtl....to get a good level of volume replace the
electro caps ...start around the two speaker wires and work back from there. I'm in the process of rebuilding a 148 gtl and have found caps that are leaky and dried out...after replacing nine the volume went up to a good level...now i need to fix the distortion
and background hash. Did you know that there are many posts
on FIXYA about this same problem I.E. great TX , great PA but poor , or no audio out. these sets have been made in sevetal countries...The sets made in Taiwan or China have poor quality
front panel pots (the carbon track is micro thin and simply wares through to the material the track is printed on) This has the same effect as removing a wire from a pot I.E. no audio. The good news is that 99% of parts in the radio are freely available and that includes the front panel controls. ONE WONDERS IF THE SET IS WORTH THE EFFORT !!!

CHEERS GUYS / GIRLS.

Posted on Jul 03, 2008

  •  Laron
    Laron Aug 20, 2011

    Good info so i figured you needed a vote. Thanks!!!!

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Check/replace the resistor that you can jump with your finger. I did the same on a resistor right beside the ta7222 whutever ic and got my receive back, I am sending out weak sound, but not enough to register anything on my tester yet. looking into my final transistor now and other ideas would be appreciated

Posted on Feb 20, 2007

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Is it posible that the speaker plug-in is damaged

Posted on Dec 27, 2006

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148nwgtl no audio just noise volume good, it had talkback wired in
would like to remove it

Posted on Jun 18, 2011

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Is there any hiss coming from the speaker.check first common faults .check speaker might not be working .unplug check speaker with circuit tester to see if it has contact . or put an ex speaker at the rear next to pa plug.to see if another speaker will work.

Posted on Jan 28, 2007

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Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

7008f3b.jpg

Good luck and thank you for asking FixYa.

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Just a thought from Mechanic


Well, first your pa does not go thru your audio chip,take the cover off,with the radio circuit board down, the audio chip is on the right side-rail,the chip close to you, now turn it over and inspect it for cold solder joints,if you need to replace it you have to heat sink it with heat sink silicone, to remove it you need wire wick,it soaks up the solder,make sure you clean the old off with a paper towel,use 60-40 rosin core solder........hope this helps.....

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