Question about Cobra 148 GTL 120-Channels Base CB Radio

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I have a new cobra 148 with ssb, about 6 months old, while i was away there was a storm, now the radio doesnt work , recieve or transmit, i also have a cobra 29 ltd that wont transmit but it will recieve. is this an easy fix or is it best to trash them because of the repair cost? ( antron 99 antenna )

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Make sure the mic is good. If for some reason the mic went bad, it will not receive or transmit.

As for the one with no receive, it most likely needs a new final.

If lightning hit your antron, it would be in pieces.

Posted on Sep 08, 2010

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1 Answer

Have a cobra 2000 gtl has no output on am but has recieve? works fine on ssb. final and driver replaced.


could be a blown tx diode in am.you would be better off taking it to a tech and let him fix it then to mess with it and have something else go wrong.

Dec 24, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Have a new cobra 148 gtl took out of box no transmit or recieve


make sure that your [swr] hadn't changed or went higher than a 1.5, anything higher will interfere with your tranmitting an recieving. other than that with out being there to see an hear your radio this would be the first place to start.

Apr 25, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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try adjusting the L36,L38 to the highest reading on the external meter and then adjust VR10 TO 4 watts. If this doesn't cure the problem, you have a weak final transistor. Good Luck

Feb 06, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

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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

2 Answers

My ranger 2950 will receive but will not transmit, also where can i get a 6 pin mike for this same radio ?


check tr 51 (Q 51) the sb754 on the back side mounting of the radio.. the center pin (collector) of this modulator ic should not be 13 volts. my bet is that it is.. this test is done in am mode.. not sideband.
depending on you carrier setiing it should be between 3 -8 volts any higher in am mode and my bet is that its bad... much more common than the finals in this radio. good luck Rick

Dec 13, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl


Open the radio up and find the L22 Can/Pot. It's the one with the wire soldered on top. With both fine and coarse Claifier/Voice Locks in the 12 O'Clock positions, confirm, then listen for someone that is on the correct frequency and turn this pot (small ferrite core inside) with a small plastic preferred screwdriver, until they sound clear. Do this for USB as well except, the Can/Pot is L59. Don't adjust the VR5 (transmit) unless you need to.

Oct 06, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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