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

1 Answer

I have a Cobra 148 mounted on the hump in a pickup truck and it works fine. Then I plugged in a old Turner +3 desk microphone and I get bad feedback when it is keyed up and I can also hear my voice thru...

You're most likely getting lots of RF feedback from the metal cab of your truck,combined with the real sensitive nature of the amplified Turner mike.I would put an old original Cobra (coffin mike) handheld mike or a Astatic Roadking 56 (RK56) on it.They are really hard to beat,especially when you have lots of feedback & squealing. I also have a 148GTL (malaysia made) that has a Turner +3 deskmike & it squeals in my truck but not in the house. The 148GTL has given me better service than ANY other radio I've owned.It has 120 channels (freeband) & upper & lower sideband. I think mine is a 5pin Cobra-type plug-in. Try a simpler mike & good luck. Squirrly

Mar 13, 2011 | 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

Power issue no power

change the reverse polarity diode.

May 06, 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

1 Answer

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,

Nov 04, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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