Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148 i have an old cobra 148GTL. while i was tunning it up i did some thing that made it to burn the fuse every time i turn it on. can u help? thanks

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Re: cobra 148


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

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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,

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