Cobra 148 GTL 120-Channels Base CB Radio Logo

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Question about Cobra 148 GTL 120-Channels Base CB Radio

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Not working Hi, cobra148gtl-40 channel has no modulation thought the mic and there is no audio or sound, the mic works thought the pa. the needle moves when you modulate but not when you are receiving. thanks

Posted by darren zimmer on

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2 Answers

Anonymous

Crafties is probably right the part you will be looking for is IC6 it's a AF power amp part number TA7222P located with the radio front faceing you and component side up it's on the right side of board twards the back and fastened to the side of the chassie the chassie is used as the heat sink it is a 10 pin in line part.Be sure to use heat sink compound on the new one when fastening it to the chassie. Good Luck

Posted on Jul 07, 2007

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  • 32 Answers

You have more than likely a dead audio output ic gone faulty.look into radio on its back you will see the audio ic on the upper righthand side of radio.the heatsink is bolted onto the case with a plastic screw . its in a single inline package type.

Posted on Jun 28, 2007

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NOT RECEVING OR TRANSMITING
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Jan 04, 2013 • Radio Communications
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Got a connex 3300HP has a ranger board and chipset won't modulate recieves fine keys up relay clicks needle doesn't move no voice either cant find schematics
You may have a dead meter.
Modulation is audio's affect on swing wattage or pep. Notice that needle moving more with your voice.
Dead key or carrier wattage is without your voice enhancing the power only with mic keyed.
I can only assume that the chipset you are referring to is an ic chip audio or pll which must be working if you are receiving audio.
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http://www.cbtricks.com/radios/galaxy/dx33hp2/graphics/dx_33hp2_sch.pdf this is a similar radio the General Lee, Connex 3300hp and Galaxy hp2 share boards i believe dont hold me to that thou.


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Aug 20, 2011 • Connex 3300 240-Channels Base CB Radio
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Jul 26, 2011 • Cobra 21 LTDST 40-Channels Base CB Radio
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Could be audio chip.
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My radio just recently incurred this problem. It receives WX band, uses PA correctly (mic transmits over PA). It will not receive or broadcast over any standard CB channel (1-40). The needle is just...
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Aug 28, 2010 • Cobra 29 WX NW ST 40-Channels Base CB...
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No modulation with strong carrier
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Jan 23, 2010 • Cobra Radio Communications
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No Modulation!!
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Most modulation problem could be traced to:
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3. the AM/SSB switch - spraying with contact cleaner is a temporary remedy; and/or
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Hope this be of initial help/idea. Without a model number, I can't be more specific as to component(s) or PCB location but pls post back for any developments (or lack thereof) or should you need additional information.

Good luck and kindest regards.
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Feb 09, 2008 • Uniden PC78ELITE 40-Channels Base CB Radio
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Just a thought from Mechanic
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148 GTL 120-Channels Base CB Radio

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Be the first to answer Aug 04, 2009 • Cobra 148 GTL 120-Channels Base CB Radio

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