Question about Cobra 18 WX ST 40-Channels Base CB Radio

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How to tune and peak a cobra 18WXSTII - Cobra 18 WX ST 40-Channels Base CB Radio

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  • Cobra Master
  • 1,795 Answers

Should never tune.they are tuned from the factory.Now peak thats different.The only thing you can do is turn the watts up or down and turn the mod vr up. you need a meter to do this.A schematic will also help.now have at it.

Posted on Sep 01, 2014

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Posted on Jan 02, 2017

  • 6 Answers

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

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

  • 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

  • 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

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

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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

Can i peak and tune a cobra 18wx st


technically , yes legally , no. besides this is a false statement. A radio is already tuned when you get it by the factory. now the true part is the it should be tuned to specs otherwise you are possiably interferring with other operators on the amature bands 4 watts is max and 95% mod will give you plenty of swing.

Mar 11, 2012 | Cobra 18 WX ST II 40-Channels Base CB...

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Cobra 150 gtl dx peak and tune


first off if you don't have the proper equipment to do this you will have a cobra 150gtl dx used in the box that you can use for a chock block. turn the wrong can and you will never be able to get it back to working order.

Jan 16, 2012 | Cobra 150 GTL DX Base CB Radio

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Cobra 29 ltd tuning


it then you allare not tuning the radio. you are t deswr then you are not tuning the radio but you are tuning the antenna. if you are talking about alignment to get the radio on freq then there is some specific and precise work to be done in the radio. if you are talking about peak and tune then just turn vr4 all the way to the left.

Jul 01, 2011 | Cobra Radio Communications

1 Answer

I need more transmission range for free


A lot of people will say that you need to peak and tune the radio to get more range. And it will, but what it really comes down to is your antenna system.

Even with the best peak and tune, if you don't have a good antenna system, it won't do you any good.

You need to make sure the antenna is a good match. If you don't know what that means, then you should refer to your manual on SWR. The antenna has to be tuned so that transmit power does not get reflected back into the radio. If that is happening, all of the RF power is not leaving the antenna, and you are not getting out as good as you can.

Once you have a good antenna system, then you can worry about peak and tuning. But for a peak and tune, I charge.

Sep 04, 2010 | Cobra 19 Ultra II CB Radio

1 Answer

I can not get out on my cb i can hear them but they can not hear me its a cobra


turn the mic gain all the way up. Make sure the antenna has been tuned for best SWR.

Take your radio to a CB shop and have them peak and tune it.

Mar 29, 2010 | Cobra 19 Ultra II 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

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