Question about Cobra 29 LTD CB Radio

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Cobra 29 Ltd Classic

Would like to increase the output power of my CB and know that there is a way to do it on the inside of the cb and would like to know how to do it I have a schematic diagram of the radio

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In most cases just turning up VR4 is more then enough. Replacing the final, tr14 with another transistor requires changing many more parts to get it to work.

With a new 29, there is no need to change the final. Just turn vr4 all the way up and you will see around 20 - 25 watts. L13 won't gain you a single watt. L12 will raise the dead key, and usually you want a lower dead key for good swing. L14 will gain you a few watts, but don't adjust this unless you have a watt meter. You turn it out to increase wattage, but too much will over bias the final and shorten its life.

You hook it to a watt meter with a dummy load. Then say a steady AHHHH into the mic while keyed. Turn the slug out until the needle stops going up, then back it down to where it stopped.

The easy thing to do, and you will be pleased is just to turn VR4 up. Now, Up is counter clockwise. Its a variable resistor, so the less resistance, the more modulation. So you want to turn the VR down.

that will be more then enough.

Posted on Apr 25, 2009

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  • Master
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Hi,

Appreciate the direct "Ask Me".

To my knowledge, there are four versions of the Cobra 29LTD; LTD, LTD Classic, LTD Classic Gold and LTD Classic China. it is possible that the component/board layout number may differ with the one that you have. Additionally, most of the Cobra 29s uses a variety of Uniden PC78 board. Should you wish to try for experimental purposes only (but pls keep in mind probable difference of boards):

  • Modulation improvement - adjust VR4 to desired level or cut D11or max talkpower remove TR18 ;
  • AM Power - adjust L12, 13 & 14 for maximum power output using a dummy load/watt meter;
  • replace TR14 with 2SC1969 or 2SC1307.
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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Benimur
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SOURCE: Cobra 29 Ltd

Hi,

Appreciate the direct "Ask Me" again.

The initial posting would still hold true, best would be:

  • remove TR18;
  • replace 2SC2069 with 2SC1969; and
  • adjust L12, 13 & 14.
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 08, 2008

6ya6ya
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Posted on Jan 02, 2017

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