Question about Cobra 29 LTD CB Radio

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New power chip

Replace cobra power chip with RF-C1969 chip

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Won't do you any good unless you change the driver too.

Posted on Feb 19, 2009

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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

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1 Answer

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RF gain is basically how open your receive is. There is really no reason ever to have it down unless you are trying to hear only close stations to you.

If you RF gain is up, your mic pins my be oxidized, or mic bad.
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Just because the chip is warm doesn't mean it's bad, especially if it seems to work fine otherwise. Do however make sure that the device is properly heatsinked, and inspect the work done in the process of any modifications. If for some reason the device is self-oscillating it could do so at a frequency above hearing thereby going unnoticed. That will cause the device to overheat, and also make modulation weak and the RF to splatter out of band. You'll have lots of power on the RF wattmeter, but people can barely hear you if that's the case.

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