Question about Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Corba 2000GTL # 53003909 Low are no transmit.. Bought off E-Bay...Had factor hand mic..Has extra channel witch are selected at the sp1 and sp2 selector switch.Both meter were stuck,It would transmit at first light would dim during modulation,and would cal in swr mod.Repace both meters clean up board.Seem to quit transmiting,so replace mic with turner plus 3. Receive well and shows modulation on am,but doesnt seem to trasmit any more.Radio will power up with power switch in the off postion if Turner three mic is in Electonic position at selector switch.

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  • Andy Beck Feb 05, 2010

    corbra 2000
    4,5 volts at am carrier will not ajust.3.5 volt at ssd carrier will ajust but max out at 3.5 volts. losses voltage at ssb carrier when switched to lsd are usd. low are no transmission on ssb.Recieve well.

  • Andy Beck Feb 05, 2010

    thanks for you help you gave me an idea to where to get started..

  • Michael Sanson
    Michael Sanson Jan 29, 2012

    Did you ever get that Cobra 2000GTL fixed?

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  • Master
  • 14,553 Answers

The problem with these radios (I have owned 4 of them and also repaired them) is that if they were "tweaked" too high several bad things can happen.

If you have both AM and SSB transmit but it is very low output--suspect either the Driver or Final transistor are bad. You will need to unsolder all three leads (ECB) on each transistor and test them with a ohm meter.

If either is bad----replace both--also note which transistors are in the radio--some people will replace them with "higher" output transistors to get more output.

If the radio had modifications for a carrier control---it would only affect output on AM.

The weak point in this radio if it has been tweaked is the voltage regulator IC located on the right wall of the set next to the audio output IC chip.

Checking voltages will not really tell you very much---Confirm first the actual condition of Driver and Final transistors. Some good advice would be if replacing them restores transmit instantly lower both AM and SSB output either with the controls or by alignment of the driver and final stages of the radio.

The fact that the radio was dimming the meter lights before is a dead giveaway that the radio was pulling maximum voltage from the regulator IC in the radio's power supply.

Something else you may want to try that may or may not confirm this is switch the switch on the back of the radio and connect it to the DC power socket----IF RADIO WORKS THAT WAY-internal power supply is damaged and not the Driver/Final stage.

Let me know what you find.

SD TECH

Posted on Feb 05, 2010

  • SD Tech
    SD Tech Feb 06, 2010

    Anyone with a Cobra 2000 GTL or other base station or Mobile radio who needs help should post a question here attention to SD TECH.

    sd tech


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  • Master
  • 8,220 Answers

You should carry that guy out to the nearest truck stop. Find the CB tech. He can make that ****** rule!

Posted on Feb 05, 2010

  • Dan Webster
    Dan Webster Feb 05, 2010

    Change that dang mike and adjust the antenna with a screw driver till you get out. Dammit boy ain't nobody messed with CBs in 20 years cept trucker. Yeah I have double clutched my a$$ off a time er 2.
    Ain't no money in truckin and ain't no CBers left son they use VFH now. Get with the program.


  • Dan Webster
    Dan Webster Feb 20, 2010

    Excellent SD

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