Question about Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Cobra 142 no audio

Puts out modulated carrier & SSB but no audio

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If you are using an external speaker, make sure your 1/8" audio jack is tip ring (it only has one black line or mono) and not tip ring sleeve (has two black lines / is stereo) if you must use a tip ring sleeve, insert it half way.

Posted on Nov 26, 2014

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Check to make sure the ext speaker jack is not worn out. Even the internal speaker will not work if it is worn.

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

SOURCE: 142 GTL Good AM Carrier Weak Modulation????

Have you checked TR 26 AMC amp, and TR 24 & 25 AMC amps also for SSB TR34 ALC amp. make sure all voltages are right if all checks out try lifting out of the board or cut the collector of TR24 and try it. oop's that slipped out.

Posted on Jul 07, 2007

  • 9 Answers

SOURCE: Cobra 148GTL Missing TX Modulation

The problem is most likely the audio ic . open the radio and see if the diode 44 is blown or see if you see anything that looks like it got hot around the plug area. if not contact me and i will buy it. is it an old or new 148 gtl.Read more

Posted on Dec 06, 2008

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SOURCE: cobra 148 gtl b no recieve

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

Posted on Feb 02, 2009

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SOURCE: Cobra 148 GTL ST. No AM transmit audio. Carrier is

Could be TR41 or TR42. I would try TR41 first.

Posted on Jun 29, 2011

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1 Answer

Galaxy 979 SSB Modulation Problem Voice Cuts Out.


It sounds like you had a cold solder joint. Leaving it in the sun probably temporarily corrected it. I would take it to a tech to have all the solder joints corrected, unless you are handy with a soldering iron. The problem will most likely come back.

All you have to do is pull the top cover off, which will show the bottom, or trace side of the board. Using a soldering iron, make sure any solder joint that doesn't fully look soldered and make sure the solder is fully covering the joint. If need you may have to add solder.

As for the frequency counter going nutty when you modulate, Don't worry about it. There is nothing wrong. Because when you modulate you are modulating the carrier signal you are changing the signal so the counter will interpret that as a different freq because it cannot differentiate. Freq counters are for use with carrier only. As long as the carrier shows correct, it is right.

Aug 11, 2012 | Galaxy Radios 979 40 Channel Am/ssb Mobile...

1 Answer

Problems with Cobra 142 GTL


the diode and missing resisters are and caps are probably the culprits.

Feb 01, 2012 | Cobra Radio Communications

1 Answer

How to turn up power on cobra 142 gtl


Am power VR6
ssb power VR7
Modulation cut r-104

Nov 19, 2011 | Cobra Radio Communications

2 Answers

Just want to know if i should use my ll203 amp in am or ssb mode when running with a cobra CB radio?


What radio?? Does it have single side band(SSB)? If not, then don't use SSB.

AM - amplitude modulation
SSB - single side band.

If you have SSB, there would be a switch on it to transmit in SSB. If not, it is AM only.

Second, Has this radio been worked on to be able to run on an amp? If not, you will blow the amp.

A CB radio transmits dead keys with 4 watts of power, and transmits with 4 watts of audio.

a 4 watt dead key is too much for a linear amp. You will smoke the transistors. Also, 4 watts of audio is not enough to drive it properly. You won't get full power.

The dead key needs to be around 2 to 2 -1/2 watts,or what ever makes the linear dead key half its peak wattage., and the modulation (audio) turned up all the way.

It doesn't sound like you know too much about CB radio's. Not a big deal, you can learn. For right now you may want to take it to a cb shop and tell them you want a peak and tune, and set up to run a linear.

You can find CB shops usually at truck stops. Some area's they are other places. Check the internet for local shops.

Oct 31, 2009 | Galaxy Radios DX-959 40-Channels Base CB...

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

Audio limiter


tintlady, here is the info you requested;
the AM limiter is R 276

These are the variable adjustments inside,and what they control.
VR-1 AM S-METER
VR-2 SSB S-METER
VR-3 SSB SQUELCH RANGE
VR-4 AM SQUELCH RANGE
VR-6 SSB CARRIER BALANCE
VR-7 TX OFFSET
VR-9 RF METER
VR-10 FINAL BIAS
VR-12 DRIVER BIAS
VR-13 SSB ALC
VR-14 AM HIGH POWER
VR-15 AM MODULATION METER
VR-16 AM MODULATION
VR-17 SSB POWER
VR-18 AM LOW POWER
VC1-10.240 MHz Frequency adjustment

Hope this helps you out, let me know,,Mechanic

Jan 20, 2008 | Radio Communications

2 Answers

No AM carrier or modulation. SSB transmits good


what cb is it ? it sounds like your am section is not getting powered up when you switch from ssb to am. If i know the model i may have a diagram of it here and suggest a place to start

May 02, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

142 GTL Good AM Carrier Weak Modulation????


you may have to scope the finals circuit on the modulation to see if all the "inline" caps are installed correctly... be sure your pc board is grounded in all areas as required by specs in your manual. Make sure there is no bleedover and you are sheilding your crystals from the modulation platform. al

Mar 24, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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