Question about Cobra 29 LTD CB Radio

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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

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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.

Posted on Sep 24, 2009

  • santerre1974 Oct 07, 2010

    never will get caught ... everyone should crank it

×

You NEVER touch the factory settings inside any radio transceiver EVER !!!!!!

you use a TX RX amp a linear amp with preamp

youll end up with the authorities at your door for harminic interfearance etc to local services

if its not broken dont try to fix it !!!!

read and learn NEVER!!!!! touch the inside of a good non adjusted radio even if someone says it worked for them

dont listen

ye go to the cb shop
but any engineer worth his salt will tell you to get a better antenna
live higher up or buy an amp and a better antenna

Posted on Dec 02, 2014

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2 Answers

Got a cobra 29 ltd classic dead keys 10 watts and swings back to 6 watts on an external meter any answers


Hi you have to make sure your antenna has 1:1 SWR reading improper use of antennas deplete the Effective radiating Power of Transmitting equipment such as the CB radio.

Mar 15, 2016 | Cobra Radio Communications

1 Answer

Cobra 29 ltd classic has no key watts


Not sure why you removed a resistor, but apparently it was needed in order to make the radio transmit properly. Put the resistor back in, or a new one of the same value. If you don't know the required value (because it was fried, etc.), I'd recomend bringing it to a shop, as there is most likely something else wrong with the unit.

If you really want to try and repair it yourself, and don't know the value, check out the schematics at the link below; just be sure that you are looking at the schematics that pertain to your radio, as there are a number of different versions of the Cobra 29.

Cobra 29 - CBTRICKS.COM

Oct 27, 2011 | Cobra 29 LTD CB Radio

1 Answer

Not enough audio and i dont want a power mic i


Take off the cover, you will need a watt meter or mod meter to do this. On the circuit board, part side up, look for D11, and cut one end of it, hook up meter, key the mike and with a peaking or tuning tool, while saying aaahhhhhhh in a long and steady voice, tune L12,L13,L14 for highest peak, you can get the tool there also..put cover back on and enjoy.....hope this helps...

Jun 03, 2010 | Cobra 29 LTD CB Radio

1 Answer

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....

Mar 12, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 classic "swing kit" ?


A swing kit is nothing more then a Cap and a resistor. There really isn't a different way to do a swing kit, unless you do variable power, which you don't need unless you are going to run a linear, and even then you can just set the dead key with a swing kit.

you need a watt meter, preferably one that reads peak and average watts. If not, average will be find.

Open the bottom cover of the radio. Hook the radio up to the watt meter, use a dummy load or have it hooked to the antenna. Never key the radio with an antenna or a dummy load.

Find VR4. Its toward the back right of the radio. Turn it all the way to the left. That increases your modulation.

Next find L14. it is at the back in front of the final resistor. While making a steady sound into the radio, just make an ahhhhhhh noise. Back the slug out of the tank until the needle hits peak. Don't move it out any more or you will over bias the final.

Now you will need a 220 uf electrolytic cap, and a 100 ohm 1/2 watt resistor, both of which you can get from radio shack. (this is your swing kit.

To the right of the tank slug is a jumper maked JP36. Us soldering wick to remove the solder and pull out the jumper. Now put the cap in it with the stripe facing the back of the radio.(that is very important. the other way you will blow the radio.) Solder it in place and cut the extra leads off. Now on the back of the board were you soldered in the cap, solder the 100 ohm resistor in between the 2 points.

The amount of resistance determines you dead key. you will be at about a 2 watt dead key which is good for swing and if you want to run a linear. The higher the resistor the lower the dead key, and the lower the cap, the higher the dead key.

That is your basic peak and tune with a swing kit.


Dec 23, 2009 | Cobra 29 LTD 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

1 Answer

Just want know how to peak the power back up on my 29 ltd classic. its only putting out 2 watts on ch. 20 I suspect someone had a linnear on it prior.


Just tune L10,L9,L8 for maximum.

How electronically able are you?
I can tell you how to do what most call the super modulation mod, it isn't too hard and isn't very expensive. (Unless you take it to a CB shop!)

Oct 07, 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

1 Answer

Cobra 29 LTD Bluetooth


You got your radio peaked? Most likely, however, the pot for the antenna warning indicator is VR6. I always check that after peaking a radio.

Jul 28, 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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