Cobra 21 LTDST 40-Channels Base CB Radio Logo

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Posted on Apr 14, 2009
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Just need a diagram for the 21 gtl cb radio, where can i find this..??

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  • Posted on May 10, 2009
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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.

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  • 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
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