Question about Cobra 148 GTL 120-Channels Base CB Radio

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I NEED A WIREING DIAGRAM FOR A COBRA 146-GTL SSB RADIO

Posted by Anonymous on

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  • Cobra Master
  • 1,795 Answers

Same as cobra 29

Posted on Nov 02, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

SOURCE: cobra 150 gtl dx nightwatch

You can send it into a factory authorized repair center, one is in TN that is highly recommended. This is an excellent radio if it has been adjusted properly and the factory mods have been done. Take a look at cbtricks.com for full info on the problems with these radios. Do not take to a regular repair shop; this is a SMT design(surface mount technology) and requires thousands of dollars of equipment and expertise to work on. Trust me I tried to adjust mine and messed it up and had to wait to have them reset it. This radio is very difficult to work on and should be sent into a factory rep. Contact cobra for repair station.

Posted on Aug 10, 2008

audio20
  • 22 Answers

SOURCE: cobra 148 gtl dx manual

This is the Manual for the C148GTL

Posted on Apr 23, 2009

  • 773 Answers

SOURCE: Cobra 1000 GTL by Dynascan

This is a complicated modification. I have never done it to a 1000 GTL, but its done basically the same in all radio's.

I don't recommend doing it, especially since I am not 100% sure on how exactly to do it. I have never been in a 1000 gtl. If I had one in front of me I could tell you for sure how to do it.

If the reason for Variable power is a linear, just a swing kit in for the dead key you need, most likely 2 watts, and leave it.

Here is how to do a variable power mod. this is assuming the swing mod is done the same to this as a cobra 25/29 or uniden 68/76 etc.

If you would like to try it, here it is.

You get a TIP31 transistor, Radioshack has them.

Where you put the swing mod in the radio, which is a cap and a resistor, you put the TIP31 and cap. A 47uf cap works fine.

With the resistor facing you, and the tab in the back away, solder the cap to the transistor. the leg with the black stripe goes on the right most leg. then the other goes to the center leg of the transistor.

Solder a wire on the left most leg, long enough to reach the front of the radio. Now solder the 2 legs that don't have the wire on it, in the place where you would put the swing kit, with the black stripe on the cap facing the back of the radio usually.

Remove the wires from the RF gain and solder them together.

Now solder the wire from the transistor to the center tab.

Remove VR6 and solder a wire from the top tag of the RF gain to the top connection of VR6 that you removed.

Then connect a wire from the bottom tag to a ground point. The side of a tuning can works fine.

Take a piece of shrink tube and put it over the TIP31 so it does not ground against the heat sink, that would be bad.

This is done basically the same in all cb radio's.


Posted on May 03, 2009

  • 10 Answers

SOURCE: No modulation in AAM only mode. Needing a schematic.

if the transmitter produces power output with modulation on SSB but NOT ON AM then the AM Pass Regulator is defective, more times than not.

Posted on Jun 10, 2009

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Related Questions:

1 Answer

Why is a dead key on ssb when mic is keyed down?


Cobra 29 LTD doesn't have SSB. You must have a Cobra 146 GTL or one of the Cobra 148 GTL's.

Jun 13, 2014 | Cobra 29 LTD CB Radio

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

Cobra 200 gtl dx only does 12 watts on high


Open radio up and adjust rv9for am fm high power or rv 14 for ssb for high power,do not use a screwdriver,a matchstick would be better.board information is available from cb tricks.com

Dec 17, 2011 | Cobra 200 GTL DX 4-Channels Base CB Radio

1 Answer

No modulation in AAM only mode. Needing a schematic.


if the transmitter produces power output with modulation on SSB but NOT ON AM then the AM Pass Regulator is defective, more times than not.

May 24, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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

Cobra 148 gtl stays keyed up on tx on both am and ssb


Your problem is a faulty changeover relay on the circuit board. It is a small black device , and may have the brand name MRATA
etched on it (the switchover contact points are stuck together)
WORTH A TRY GOOD LUCK
flyingfox@prople.net.au

Mar 30, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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