Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148 gtl vr12

MY MODULATION GETS CLIPPED EVEN WHEN ON MY TURNER SUPER SIDE KICK.
cAN I MAKE AN ADJUSTMENT ON MODULATION? Comment posted on Mar 08, 2009 Hey thanks man, that was it. What is VR12 right next to it because I accidently moved it a bit...
My modulation is now about 80%

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Your clipper, which set your mod. is r151 restor cut one end and it will open up the clipper be loud now enjoy McGyver

Posted on Apr 04, 2009

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If you want more than that you can clip the limiter insde the radio that will be r 131 by the first can with the face of the radio toward you on the right. in front of the can. there is a transistor in front of the can then the resistor.

Posted on Mar 10, 2009

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1 Answer

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you are not matching it correctly. get hold of a friend that knows how to match it and see if he will help you.

Mar 18, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

Schematics for a cobra 148 NW


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.

Jan 31, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

148 cobra with no modulation


possably corrosion on the pins of the plug into the radio, unscrew, push in and out a couple of times, and try again, maybe a break in the cable where it flexes the most. or faulty antenna

Oct 23, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

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

148 GTL-B 60 CHANNEL W LOWER SIDE BAND


AFTER LOOKING AT THE SCHEMATIC DRAWING VR 11 IS THE MODULATION ADJUSTER TURN THE DYNAMIC ALL THE WAY CLOCKWISE REMOVE THE SPEAKER COVER AND LOOK TOWARD THE BACK OF TH RADIO YOU WILL SEE A TRANSFORMER WITHE THE FACEPLATE TOWARD YOU ON THE LEFT SIDE YOU SHOULD FIND VR11 TURN THAT POT ONLY DO NOT THINK YOU WILL TUNE THE RADIO YOURSELF BECAUSE IT WILL MESS IT UP AND IT WILL COST ANYWHERE FORM $50 TO 75.00 TO GET IT ALIGNED.TURN VR11 TO OPEN THE MODULATION CIRCUIT YOU WILL KNOW IF YOU GO THE WRONG WAY YOU WILL LOOSE MODULATION TURN IT OPPOSITE AND IT WILL COME BACK MAKE SURE YOU HAVE A ANTENNA CONECTED WHILE YOU KEY THE MIC TO MAKE THIS ADJUSTMENT.

Mar 04, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl b no recieve


make sure that the rf gain is turned up all the way.Check diodes D-12&D-13.

Jan 08, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra gtl 148 seems to have no power til i push on mic connecter.


cobra 148 shows no wattage output on external meter but does show good modulation.

Dec 08, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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