Question about Cobra 21 LTDST 40-Channels Base CB Radio

1 Answer

Cobra 21 gtl

No transmit

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  • Cobra Master
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Final or main IC or both. check final first.

Posted on Dec 21, 2014

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Posted on Jan 02, 2017

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Shuttle83
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SOURCE: cobra 148 gtl new model

Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.

Posted on Oct 07, 2007

SOURCE: 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.

Posted on Dec 01, 2007

SOURCE: cobra 148 gtl

First take a jumper wire and connect it to the DC Ground of the input of the radio then touch it to the TX pin on the radio if it does keyes up then its in the mic or mic cord on the end of the mic plug or where it goes into the mic cable goes up inside the mic. If the radio don't key up at all then check the main voltage regulator chip one pin will have 8 volts transmit and another pin will have 8volts recieve. If you get no switching DC voltage on the regulator then its bad and needs replacing there is also a known bad capacitor in the radio thats only 10 volts change it to 25 volts at the same capacitance.

Posted on Jan 08, 2008

  • 9 Answers

SOURCE: cobra 148 gtl channel mods

contact me i can mod your radio for 65.00

Posted on Dec 06, 2008

audio20
  • 22 Answers

SOURCE: cobra 148 gtl dx manual

This is the Manual for the C148GTL

Posted on Apr 23, 2009

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1 Answer

My cobra 148gtl sometimes will transmit and after a few minutes when keyed up will not transmit


try some canned air on the final to cool it down .If the radio comes on then you have the problem child.

Apr 16, 2014 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Cobra 148 gtl d has problem transmiting with covers off. trying to tune radio up. was thinking I need to ground the chasis


I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.

Oct 25, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl-st wont transmit but receives great


Check first your microphone

• check if TX is engaging when PTT is pushed.


• check for continuity ( mic and cable )



If you have not done these steps,

try it first, or borrow other compatible mic for Cobra 148GTL

from your friends on air.

Jul 28, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 150 Lights up,and receives but does not


I know this is going to sound stupid but if you hit or should I say tap ot it will it transmit. If so then you have a bad soilder some where on the board if not its probably your voltage regulator gone bad.

May 22, 2010 | Cobra 150 GTL DX Base CB Radio

1 Answer

Hi. I have a cobra 150 gtl dx and the needle does not move and it seems nobody listens to me when transmitting. What might be the fault?


These have a known problem with the radio's finals. They may be bad and this would require replacing by a technician.

Feb 12, 2010 | Cobra 150 GTL DX Base CB Radio

1 Answer

Gtl dx will not transmit below 26.955


First off, the 200 GTL DX is a 10 meter radio. Running it on 11 meters (CB) is illegal, as it is not FCC type accepted. If you go below 26.965 mhz, you are outside of the 11 meter band, and operating illegally.12 meters does not start until 24.930, so ultimately, the freq's between 24.930 and 26.965 mhz are restricted even to a licensed amateur radio operator.

Jul 09, 2009 | Cobra Radio Communications

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

1 Answer

Just need a diagram for the 21 gtl cb radio, where can i find this..??


you can find the diagran for this radio at the following web site:

www.cbtricks.com look in the radio section go to the c sections look in the cobra dynascan section find the cobre 21 gtl click on the radio and down load the pdf file in the schematic section good luck.

Apr 14, 2009 | Cobra 21 LTDST 40-Channels Base CB Radio

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