Question about Cobra 148 GTL 120-Channels Base CB Radio

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Need more channels and power

I am owner of Cobra 148 GTL made in Philippines run from 26965 to 28045
uses MB8719 and output transsistor 2sc1307 and 2sc1969

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How much power are you looking for the mrf 455 final will not yield you 50 watts impossible with out rebuilding the whole power strip. the final that i would use is the workman cb-20 it is a 20 watt final ther is alot to this to get what you need. better getting a amp.

Posted on Mar 08, 2009

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

Posted on Mar 05, 2009

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1 Answer

How do I increase power output for a cobra 148 gtl the latest Chinese version


best way is to leave the radio in piece and obtain a linear amplifier to do the job a 10 meter ham radio amplifier will do nicely but you must re-tune it for the 27 mhz band 10 meter band is 28 mhz.
RF amps work best using side-band mode.

Oct 14, 2013 | 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

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

Nov 09, 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

1 Answer

Have a cobra 148 gtl cb/ssb. It is brand new. I hvae it hooked up and have tuned the antenna using the swr meter on the cb. I habe channel 1 and channel 40 metting at about 1.6 swr. I have what appears to...


Hi, my name is John. Welcome to FixYa. Check your antenna, you need to set it with a real SWR meter, pick one up at any near-by CB shack $10.00. Thanks for choosing Fixya...John

Jul 22, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

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

2 Answers

Cb radio mod


The 148m gtl can be converted to get extra channels here is how u do it index.php?act=attach&type=post&id=817

Mar 26, 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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