Cobra 18 WX ST 40-Channels Base CB Radio Logo

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Anonymous Posted on Feb 06, 2014

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

1 Answer

Mike Charette

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  • Posted on Sep 01, 2014
Mike Charette
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Joined: Sep 24, 2009
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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.

5 Related Answers

Anonymous

  • 6 Answers
  • Posted on Sep 24, 2009

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.

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Anonymous

  • 773 Answers
  • Posted on Oct 03, 2009

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.

Anonymous

  • 11 Answers
  • Posted on Jan 23, 2010

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.

Anonymous

  • 1274 Answers
  • Posted on Mar 12, 2010

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....

Ironfist109

Iron

  • 3018 Answers
  • Posted on Oct 13, 2011

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

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

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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.
1helpful
2answers

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.
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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.
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