Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl cb no recive, the power supply put 20+volts inti it, what could be the problom.

Posted by john ruff on

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1 Answer

Steve

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  • Cobra Master
  • 3,289 Answers

Your power supply is providing 20 volts? THAT is the problem. This radio should be connected to a power supply capable of providing anywhere between 12 ~ 13.8 VDC. Twenty volts is WAY too much. You may have cause significant damage to the radio if it was connected to that voltage for any period of time.

Posted on Jan 15, 2013

Testimonial: "power supply rectifiers and regulater ng .when the raido is on it puts out a carrer, no receive,conld be a realy for the mic.and where can i find one.thans john."

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3 Related Answers

Anonymous

  • 22 Answers

SOURCE: cobra 148 gtl dx manual

This is the Manual for the C148GTL

Posted on Apr 23, 2009

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Ironfist109

Iron

  • 3018 Answers

SOURCE: schematic diagram of cobra 148 gtl cb radio china made

  • Locate the MB8719 chip that is right behind the channel selector. Wire a SPST switch from pin 10 to ground and another from pin 11 to pin 12.


  • Channel Chart
  • Position 1: sw1 down, sw2 down
  • NORMAL CHANNELS

  • Position 2: sw1 up, sw2 down
  • 15=26.815 20=26.885 25=26.925 30=26.985(ch3)
  • 16=26.835 21=26.895 26=26.945 31=26.995(ch3A)
  • 17=26.845 22=26.905 27=26.955 32=27.005(ch4)
  • 18=26.855 23=26.935 28=26.965(ch1)
  • 19=26.865 24=26.915 29=26.975(ch2)

  • Position 3: sw1 up, sw2 up

  • 1=27.605 6=27.505 10=27.555 14=27.605
  • 2=27.455 7=27.515 11=27.565 16=27.475
  • 3=27.465 8=27.535 12=27.585 20=27.525
  • 4=27.485 9=27.545 13=27.595 23=27.575
  • 5=27.495

  • Position 4: sw1 down, sw2 up

  • 1=27.605 11=27.725 21=27.855 31=27.955
  • 2=27.615 12=27.745 22=27.865 32=27.965
  • 3=27.625 13=27.755 23=27.895 33=27.975
  • 4=27.645 14=27.765 24=27.875 34=27.985

Posted on Nov 09, 2011

Ironfist109

Iron

  • 3018 Answers

SOURCE: cobra 148 gtlcobra 148 gtl DX

  • Hi, here is your users manual http://minus.com/m8geTULWN#1 just click "download" if you want a copy of it. I have a copy of the service manual as well. Let me know if you want a copy.

  • Hope this helps.

Posted on Nov 29, 2011

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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

I have a cobra 148gtl it will not recive or transmit but it does light up


hello from my experience of this problem you will have to replace the audio and pa trancisters

Jan 07, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

I want to power my cobra 148 GTL in my home, want kind of inverter would I need to do this?, (watts)


you would probably want at least a 4watt continuous power supply or better. do not use as switching power supply.

Oct 23, 2010 | 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

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Need more channels and power


for more power replace the 1969 with mrf455 be sure the pins are inverted big power gain about 50 watts

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1 Answer

Cobra gtl 148 seems to have no power til i push on mic connecter.


cobra 148 shows no wattage output on external meter but does show good modulation.

Dec 08, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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