Question about Cobra 29 Lx Full-featured Cb Radio

1 Answer

How do i peak and tune a cobra 29 lx

I want to turn up the output power on my radio myself rather than paying someone else to do it

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  • Aaron Dennis Dec 10, 2012

    took a link to phantom mods, followed the directions except I didn,t cut my limiter

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  • Master
  • 14,553 Answers

Pay and get it done right so the radio does not get destroyed.

Posted on Dec 06, 2012

Testimonial: "thats not the first time i have been told that, however, i am very interested in learning this for myself. i can build computers and they come out kickin a#@."

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Posted on Jan 02, 2017

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Ironfist109
  • 3018 Answers

SOURCE: cobra 29 lx need owners manual and peak and tune



  • When you get to the link click on "Click here to start download from MediaFire.." and the PDF will download onto your computer.

  • The slug in the back of the radio by the final transistor turn left until desired power output is reached.
  • The coils on the right side of the heat sink for the final can be spread a little bit apart for a little more power.
  • VR1 receive gain
  • VR2 receive signal meter
  • VR3 squelch
  • VR4 AMC
  • VR5 transmit power meter
  • VR6 antenna warning light


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

Posted on Oct 13, 2011

One Wire
  • 126 Answers

SOURCE: cobra 29 ltd classick tuning

Here is a link to the Phantom CB's seb site, you can click on the brand of radio you want to peak, in you case, Cobra. Then follow through the chart to the Cobra 29 LTD Classic under the Cobra power mods, which tells you what to adjust and changes that can be made. Only one suggestion I have before you start, where it says to cut D11, don't, only turn up VR-4 for your modulation. That is the only thing I don't like with their instuctions is telling people to cut the modulation limiter. You can get full modulation by turning up the potentiometer, and if you cut the limiter, sometimes it will over modulate.

http://www.714xpress.net/714mods1.html


You need an inline power meter to peak the radio out. This is the quick and dirty way to peak and tune a radio. To properly align a radio, you really need an oscilloscope and other related test equipment.


If you have more questions, don't hesitate to post here or email me at rollincbmods@yahoo.com. I can't promise I will have an answer to all questions, but I will do the best I can to help.


Dean Pitts
Rollin CBs

Posted on Nov 21, 2008

  • 1274 Answers

SOURCE: how do i tune and peak a cobra 29 ltd classic

Only a qualified technical person is allowed to do so per FCC, (Federal Communications Commission). That means what it says. If you are not one, then you cannot do this procedure....hope this helps....

Posted on Mar 12, 2010

  • 773 Answers

SOURCE: how do i turn peak and tune my cobra 19 ultra 3

un-solder 1 leg of D11 diode, pull it out of the board, and make sure it does not short against anything.

That will bring your modulation up all the way. there are other adjustments that can be done, but without proper meters, you will most likely mess up the radio.

D11 will be a big step up any way.

Posted on Oct 03, 2009

  • 11 Answers

SOURCE: my cobra 29 has a 75watt amp on the back how can i get more

If you're using the RFX-75 amp section. Then you'll need to make sure your transmiter section is tuned for full output. The last last unit I installed in a Cobra 29 LTD, the radio modulated right at 100 watts output.
Hope this helps,
J.R.

Posted on Jan 23, 2010

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2 Answers

I have a Cobra 29 Ltd Chrome CB Radio that I would like to know how to turn the power up, and the modulation, peak and tune


vr4 turn it to the left all the way and ask for a radio check.If no one can hear you then turn it all the way to the right and have someone give you a check. You may want to check the SWR to the antenna while your at it. Thats all you can legally do.

Jul 03, 2014 | Cobra Radio Communications

1 Answer

Cobra 29 lx chr le rf power output fail


no it didn't fail. the radio is designed not to except any mods without bypassing something . If you don't know what to bypass then leave it alone and turn it back to where it was.

Feb 26, 2013 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

1 Answer

Cobra 29 LX LCD tuneing


brand new out of the package don't need tuning. just turn up the power a bit to 3.8 - 4 watts and modulation set at 95% and you will be fine.

Dec 29, 2012 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

2 Answers

Is it possible to convert the cobra 29 wx nw st sound tracker cb to 10 meter amateur band?


No it cannot. If you want that buy a Ranger or a Galaxy.

The 29 can be altered to increase modulation and turned down in power to match it to amp for increased output of power.

Set to dead key a watt or so with a 100 watt amp it would dead key low and swing to 80 to 100 watts pep.(peak envelope power)

Mar 16, 2012 | Cobra Radio Communications

1 Answer

Cobra 29 lx need owners manual and peak and tune chart. Thanks! :)




  • When you get to the link click on "Click here to start download from MediaFire.." and the PDF will download onto your computer.

  • The slug in the back of the radio by the final transistor turn left until desired power output is reached.
  • The coils on the right side of the heat sink for the final can be spread a little bit apart for a little more power.
  • VR1 receive gain
  • VR2 receive signal meter
  • VR3 squelch
  • VR4 AMC
  • VR5 transmit power meter
  • VR6 antenna warning light


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

Oct 11, 2011 | Cobra Radio Communications

2 Answers

I just purchased a connex 3400hp and my cb freinds tell me that my other radio sounds better than the cx 3400hp,my other radio is a cobra 29 ltd classic.my 29 has more audio and modulation and both radios...


The Cobra 29 has always been a good talking radio and is preferred by truck driver mainly for that reason! The Connex is a great radio in it's own right but sometimes needs a little help. I would suggest a power mic and there are many to choose from but Astatic is a clear winner! My two cents for a suggestion!

Mar 07, 2010 | Connex 3300 240-Channels Base CB Radio

1 Answer

My cobra 29 has a 75watt amp on the back how can i get more


If you're using the RFX-75 amp section. Then you'll need to make sure your transmiter section is tuned for full output. The last last unit I installed in a Cobra 29 LTD, the radio modulated right at 100 watts output.
Hope this helps,
J.R.

Dec 22, 2009 | Cobra 29 LTD CB Radio

2 Answers

How do you tune and peak a cobra 29 ltd classic and how many watts will it put out after it is tunned and peaked


i would highly suggest you take it to a cb shop to get a cb tuned and peaked. before you do that though, make sure you have a good antenna system. a good antenna will have a much greater effect on your cb than tuning and peaking. as far as output, who knows? it all depends on the skill of the person doing the tuning. be warned that any output over 4 watts is illegal and you could recieve hefty fines if caught with an illegal radio.

Sep 23, 2009 | Cobra 29 LTD CB Radio

2 Answers

I also have another cobra 29 ltd classic and it works fine but i cant talk or hear what other factory cb's can hear, it is supposed to be tuned and peaked and i have a wilson 2,000 antenna, and i cant talk...


nearly all problems are caused by poorly tuned or untuned antennas. a good antenna system with a cheap stock radio will out perform a great tuned radio with a bad antenna system any day of the week. if you dont believe me, check the firestik antenna website's tech notes. or wilson's tech notes.

Sep 23, 2009 | Cobra 29 LTD CB Radio

2 Answers

Cobra 29 ltd classick tuning


Here is a link to the Phantom CB's seb site, you can click on the brand of radio you want to peak, in you case, Cobra. Then follow through the chart to the Cobra 29 LTD Classic under the Cobra power mods, which tells you what to adjust and changes that can be made. Only one suggestion I have before you start, where it says to cut D11, don't, only turn up VR-4 for your modulation. That is the only thing I don't like with their instuctions is telling people to cut the modulation limiter. You can get full modulation by turning up the potentiometer, and if you cut the limiter, sometimes it will over modulate.

http://www.714xpress.net/714mods1.html


You need an inline power meter to peak the radio out. This is the quick and dirty way to peak and tune a radio. To properly align a radio, you really need an oscilloscope and other related test equipment.


If you have more questions, don't hesitate to post here or email me at rollincbmods@yahoo.com. I can't promise I will have an answer to all questions, but I will do the best I can to help.


Dean Pitts
Rollin CBs

Nov 20, 2008 | Cobra 29 LTD CB Radio

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