Question about Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive works fine transmit has no power

Radio has had no mods. all works well on receive. With another radio on the bench the failing radio can be heard but just has no power to the signal

Posted by Anonymous on

2 Answers

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  • 63 Answers

Yes 5 pin side plugs and they were made in malaysia. Also they have the MB8710 PLL. Easily modified for extra channels with 2 toggles and a little wire. (PLL pinout).

Posted on Mar 08, 2015

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  • Contributor
  • 37 Answers

Have you checked the 2sc2166 or the 2sc1969? Those are the RF Driver and the RF Final output transistors.

Posted on Nov 26, 2014

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  • 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

  • 37 Answers

SOURCE: Cobrba 148 gtl TX

Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean

Posted on Feb 02, 2008

Mechanic688
  • 204 Answers

SOURCE: cobra 200 gtl dx clarifier clip

Egor, hi. I'm sure there is a mod probably only known by the repair centers. I have converted and tuned the 200, but in case you don't know, the radio is full of surface mount components. They look like specks of pepper to the naked eye, and so it takes a tech with years of soldering experience to do any modding without destroying what their working on. Those radios are not a friendly radio for experimenting. I looked thru my papers that Cobra tech support sent me for converting, tuning, and other misc. mods but that info was not included. It is a nice radio when set up properly, so don't mess it up by experimenting.(just my opinion) Hope this helps,,and good luck, Mechanic

Posted on Feb 22, 2008

  • 27 Answers

SOURCE: Cobra 148 gtl Low / No receive audio

No audio out / low audio out....This is a constant problem with the COBRA 148 gtl....to get a good level of volume replace the
electro caps ...start around the two speaker wires and work back from there. I'm in the process of rebuilding a 148 gtl and have found caps that are leaky and dried out...after replacing nine the volume went up to a good level...now i need to fix the distortion
and background hash. Did you know that there are many posts
on FIXYA about this same problem I.E. great TX , great PA but poor , or no audio out. these sets have been made in sevetal countries...The sets made in Taiwan or China have poor quality
front panel pots (the carbon track is micro thin and simply wares through to the material the track is printed on) This has the same effect as removing a wire from a pot I.E. no audio. The good news is that 99% of parts in the radio are freely available and that includes the front panel controls. ONE WONDERS IF THE SET IS WORTH THE EFFORT !!!

CHEERS GUYS / GIRLS.

Posted on Jul 03, 2008

  • 9 Answers

SOURCE: cobra 148 gtl channel mods

contact me i can mod your radio for 65.00

Posted on Dec 06, 2008

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Related Questions:

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

2 Answers

148 gtl receive issues


The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Cobra 148 gtlcobra 148 gtl DX


http://www.cbtricks.com/radios/cobra/148gtl_dx/index.htm

Nice choice of radio i have the Grant LX Uniden which is roughly the older version.
This site may be of interest also if you choose the channel mod make sure you have the right PLL. http://www.radioaficion.com/HamNews/mods/mods-cb/2428-uniden-grant-xl-mods-pll-agc-power-clarifier.html

Nov 16, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My cobra 148 GTL will not key in the mobile


If you have been using this radio on the bench using a 12 Volt power supply and it was functioning properly then not operating in the mobile you need to look at fuses or a bad D.C. Plug.

Oct 18, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

148 GTL 120-Channels Base CB Radio: my 148 throws a key to my bench radio but sends no...


Hi
try replacing the transistor just before the last on the rf pa output.

Hope this helps

Ray

May 15, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl channel mods


contact me i can mod your radio for 65.00

Nov 19, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobrba 148 gtl TX


Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean

Feb 01, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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