Question about Cobra 29 LTD CB Radio

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I need a schematic for a cobra 29 nw ltd classic.I changed the driver to a 2sc1957r final to a 2sc1969,ajusted l14 and vr4 and the radio started having a delayed keyup and it quit trans. and recieve both.ckedc116-c112 with esr meter and pulled other cap all cked ok.I returned old driver and old final,still no change.Recives off band.Acts like pll cir.help!

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  • kn4u May 16, 2009

    can't read the schematic.It's not clear.pc board in this cobra 29 nw ltd classis is april-s 2008 made in china #kepc 1106.Has small 1/16th -1/18th watt resisters.

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Here you go
http://xbones_antennas.tripod.com/id21.html

Posted on May 16, 2009

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1 Answer

Cobra 29 ltd classic no modulation


check VR4 to make sure it isn't closed . Check D 11 to make sure it isn't clipped . Turn VR 4 clockwise till it stops then back it off a little .If D 11 is clipped replace it with another diode then try it again. If it doesn't work it could be your final or your driver so replace both..

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I have a cobra 25 ltd classic change final to 1969 now I can hear but no transmit. Final is new ......where should I look next?


Was the radio working before the high power transitor mod?
If so, it appears there is more to do than just replacing the transistor.
Check www.worldwidedx.com under" cobra 29 high power mod with 2sc1969 transitor." There are instructions for the complete mod.
Hope this helps

Radioman

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How do I adust the watts on my cobra 29 ltd CB


Replace the 2314 driver withe a 2SC2166 driver and the final transistor with a 2SC1969 final transistor. Re-tune coils L10,L9,L8 for maximum power. Don't cut d11 like some may say to. It will turn your radio into a crappy sounding radio. Simply adjust VR4. Never cut a limiter. This will get you some solid sounding power.

Mar 06, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 29 nw ltd classic i cannot hear or be heared


Start with the antenna that you have hooked to it, is it grounded, is the coax in good shape, is the connector in good shape. stuff like that.

Jun 14, 2009 | Cobra 29 LTD CB Radio

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it's all about R55 and L14 and etc.

Jan 11, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

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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.

Sep 07, 2008 | Cobra 29 LTD CB 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.

Sep 06, 2008 | Cobra 29 LTD CB Radio

2 Answers

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Hi,

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.

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1 Answer

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Capacitor C-82, which connects the output of the driver to the input og the final, is leaky or shorted, putting +12 volts on the base of the final, which blows it immediately.

Mar 28, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

29 help


hi, sounds like you have a problem with the SWR' S Probably too high. Tumbleweed01

Mar 12, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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