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

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Re: not working

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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Re: not working

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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Cobra 25 soundtracker with nightwatch

plug the external speaker into your PA jack and select the PA switch. If PA works then the audio chip is good. The cobra 29 must have a mic plugged in to get receive audio, You may have a broken wire at the mic connector.

Jun 19, 2014 | Cobra 29 LTD CB Radio

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Can you see the s-mete if it has one moving up and down on any channel? Do you hear any audio at all? could be a couple of things. Bad mic switch or mic cable, bad antenna or coax, bad audio amp. To check the audio amp plug in a speaker to the PA jack, put the PA switch on PA then press the mic to talk. If it works the audio is fine the mic is good and the mic cable is good. Noiw plug the speaker into the speaker jack, do you hear anything? If not then your antenna or coax has a problem, fix or replace antenna or coax.

Jan 04, 2013 | CB Radios

1 Answer

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.
Check your mic cord................ transmit and modulation and even your receive volume can be affected by the cord/mic plug solder joints or broken wires here. this is a similar radio the General Lee, Connex 3300hp and Galaxy hp2 share boards i believe dont hold me to that thou.

Aug 20, 2011 | Connex 3300 240-Channels Base CB Radio

1 Answer

I got a cobra 21 from my grandparents house when we were cleaning it out and i am trying to hook up my pa to it but it wont work i checked all my wireing and i am getting power to the radio but the pa is...

If the audio chip is bad in radio you will hear no audio on cb either.
Are you sure it is in right port?
CB/PA switch on PA
Mic bad there is and audio wire the can be broken in mic this will still let needle move on meter.

Hope this helps

Jul 26, 2011 | Cobra 21 LTDST 40-Channels Base CB Radio

1 Answer

Have a uniden pc 68 elite it seems everything works the whene transmitting the needle moves a. but it has no volume it makes no noise i have tried a different mic i have put a new ext speaker on it and it...

Could be audio chip.
  • Insert external speak jack into pa port.
  • Turn volume down
  • Switch cb/pa switch to pa
  • speak into mic
if you are getting audio from speaker ......chip is fine.

Jan 04, 2011 | Uniden Bearcat Pro PC68Elite 40-Channels...

1 Answer

I have a Uniden Pro 510xl, it's about 9 yrs old. I went to use it last week and after turning it on, found that there was no sound, (turned the squelch up) . When I keyed the mic, I saw that I was...

chk mic, lose cable in **** plug test with other mic .. also test with Ext speaker.. do u get any reading on meter / LED display during RX? does PA work? otherwise your sound chip is dead

Dec 30, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

1 Answer

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...

Hi, do you have the switch in CB mode ? Might be the audio chip, or the Finals, you will need a tech to do the job so he can set the ma on the finals. Hope this was helpful....My name is John. Thanks....good luck...

Aug 28, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

No modulation with strong carrier

sounds like your Audio Output went out......not audio chip....may be your voltage regulator also....your voltage regulator IC is heat you have a schematic?

Jan 23, 2010 | Cobra CB Radios

1 Answer

No Modulation!!


Most modulation problem could be traced to:
1. mic or the cable and/or the mic connector;
2. AMC (amplitude modulation control) - it's a single transistor that regulates modulation and occasionally has been known to clamped on the mic audio;
3. the AM/SSB switch - spraying with contact cleaner is a temporary remedy; and/or
4. audio amp - however if your receive audio is good, then this does not apply.

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.

Feb 09, 2008 | Uniden PC78ELITE 40-Channels Base CB Radio

1 Answer

Just a thought from Mechanic

Well, first your pa does not go thru your audio chip,take the cover off,with the radio circuit board down, the audio chip is on the right side-rail,the chip close to you, now turn it over and inspect it for cold solder joints,if you need to replace it you have to heat sink it with heat sink silicone, to remove it you need wire wick,it soaks up the solder,make sure you clean the old off with a paper towel,use 60-40 rosin core solder........hope this helps.....

Feb 05, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

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