Question about Cobra 148 GTL 120-Channels Base CB Radio

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Schematics for a cobra 148 NW

I can not find the schematics for a cobra 148 NW ST. All I want to do is find the modulation and max it out for my neighbor.

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  • Patrick Bottensek
    Patrick Bottensek Aug 30, 2012

    http://www.google.com/url?sa=t&rct=j...

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VR-10 is AM power
Clipping R131 will give more boost
There is no mod adjustment on this radio

Posted on Apr 11, 2010

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Most units do NOT allow modulation adjustment as any more than 90-100% modulation causes adjacent channel signal "Splatter" therefore is subject to restrictions, hence generally that is locked. Also there really is no reason to have more than 100% modulation..as well ... why? I would suggest a voice/speech "Compressor" would be more suited.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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Need schematic


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Clip D-11 .diode 11 .this is the modulation limiter .

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Hi, my name is John. Welcome to FixYa. Turn your MIC GAIN or DYNAMIC to MAX. Try another mic on it , if that does not do the job, let me know I will have further. Thanks for choosing FixYa. good luck John

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We have a Cobra 148 nw st Sound Tracker When


It could be..
Final blown : worst case
bad mic : try another one
CB/PA switch on PA instead of CB
CB/WX swithc on WX instead of CB :you cannot transmit on weather.
Broken wire on mic jack.

Try the mic and switches first, and if that doesn't help you may need to take to tech. You can find one at a cb shop usually at truck stops.


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No modulation in AAM only mode. Needing a schematic.


if the transmitter produces power output with modulation on SSB but NOT ON AM then the AM Pass Regulator is defective, more times than not.

May 24, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Yard sale find


red should be 12v black should be ground test is on a car battery.

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Cobra CB Radio 148 NW ST


The first thing to do is to check if your power wire actually has power to it. Do this with a test light or a multimeter. Given that the wire is powered, check to make sure your ground is good. Modern cars have so much plastic in them that grounds may be hard to find. The next step is to check the rig's fuse. Make sure the microphone is plugged in, too. If none of this helps, your radio needs repair or replacement.

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2 Answers

Cb radio


Not without some serious board modification.

Sep 15, 2007 | Radio Communications

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