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Cobra 25 lx special edition rf power output fail

No sound

Posted by Anonymous on

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  • Cobra Master
  • 1,795 Answers

Try it with a different antenna. make sure your swr is low

Posted on Nov 25, 2014

6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 211 Answers

SOURCE: No sound

The Cobra 25 requires the mic to be working for any sound to come out. My suggestion is that you first try a new mic. If this doesn't work, look real close at the board on the soldered side ( around the if section, thats the area that right under the waxed area on the component side of the board ) for cold solder joints ( broken lead solder) You may need a magnifing glass. Good Luck
NC Electronic
Mills, Wyoming

Posted on Jan 08, 2008

One Wire
  • 126 Answers

SOURCE: Cobra 25 LTD Classic

turn your squelch all the way counter clockwise and your rf gain clockwise. If that doesn't help, try hooking up an external speaker to make sure its not the internal speaker. If these help or don't help, please reply on this thread to let us know, so we can give you more advice if needed.

Rollin CBs

Posted on Jan 26, 2008

SOURCE: Cobra 25 LTD

most cbs have the same power cod

Posted on Aug 14, 2008

  • 6966 Answers

SOURCE: new power chip


To my knowledge on a Cobra 29 board, replacing TR14 (2SC2029) with a 2SC1969 is supposed to improve/increase the TX power output. Additionally however, L12, 13 & 14 must also be adjusted while the 29 is hooked up to a dummy load/watt meter. Should you wish to try for experimental purposes only:

  • Modulation improvement - adjust VR4 to desired level or cut D11or max talkpower remove TR18 .
  • replace TR14 with 2SC1307 (or 2SC1969).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 06, 2008

  • 90 Answers

SOURCE: Cobra 200gtl High Power Transmit problem??

Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.

Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.

Posted on Sep 26, 2008

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I just installed a new 25 lx in my rig, a Freightliner Cascadia. It's automatic test says that the battery voltage is good, but the RF out put is failing. The truck came standard with twin fibergl

It sounds like an antenna or coax problem. Twin antennas are a pain to balance and not worth the effort to install. All twin antennas do is make the antenna manufacturer richer. If the antennas use PL259s that screw into the bottom then they are nothing but water and corrosion traps. You must make sure all connections are clean and tight and waterproofed. I use an MFJ antenna analyzer to check the antennas for all my customers. It can tell you very fast if you have a problem. Any good CB shop will have one. I never trust the cheap SWR watt meters but actually the built in SWR meters on the Cobra radios are not bad indicators. I trust them much more than most external meters. Hope this help at least some. Just use your head and remember that your radio signal needs a good clean and clear unbroken path.

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