Question about Cobra 18 Wx St Ii Mobile Cb Radio

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I have a cobra 25 it will come on but wont key up to talk the mic works fine tried it on a friends cb thanks travis

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Posted on Jan 02, 2017

  • 773 Answers

SOURCE: cobra 29 ltd classic cb not transmitting

Check the ground. Make sure its grounded well on bare metal. To see if the ground is bad, or not making good connection, disconnect the antenna and turn it on. if it does not power up, that means your ground is bad, and it was grounding only through the antenna.

Make sure not to key up with out the antenna connected.

Posted on Feb 08, 2009

  • 39 Answers

SOURCE: NEED HELP WITH MIC WIRING FOR COBRA 25 LTD ST

1 Shield 2 White 3 Red 4 Black if the radio keys up as soon as you turn it on reverse 3 and 4 I am not familiar with that mic.But the way I actually should have given you the wiring order is as follows:1Shield 2 Modulation 3 and 4 key up I hope this helps.

Posted on Feb 20, 2009

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SOURCE: Cb is Keying Down instead of keying up when trying to talk

if you are transmitting fine Don't worry about the meter. Get an external SWR meter, they are better anyway.

Also, make sure the the switch next to the meter is all the way up on s/rf setting. thats for signal power and receive strength.

Posted on Oct 01, 2009

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SOURCE: installed a cobra CB ultra III on a motorcycle

The external speaker jack was not designed for a head set. It has too much power it over loads head set. You need to solder a resistor in line with the negative wire. You will have to experiment to see which value gets the audio just right for the head set you are using.

Posted on Oct 03, 2009

  • 23 Answers

SOURCE: an old cobra 29 23 channel Cb that has no audio or key up

This is a typical indication of the finals being blown. Probably have to take it to a shop, but it would be expensive compared to the value of the radio

Posted on Nov 04, 2009

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1 Answer

25 cobra cb want key up when mashing cb microphone


don't mash it.get another 4 pin mic from a cobra 25 or 29 and see if it still happens. if it does then you have an interior problem with the keying diode and or resistor.

Aug 31, 2014 | Cobra 25 LTD 40-Channel CB Radio

1 Answer

I won't transmit or receive and it doen't key up. I hooked up a spare cobra 25 and it worked fine, but I like Uniden better.


Hi,my name is John. Welcome to FixYa. First try a different mic, one thats wired for it, if I remember the cobra mic will work on it. If that does not do it, let me know, might be internal that I also can help you with. Good luck and thanks for choosing FixYa....John

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Cb transmit noise


Its just RF feed back, that's normal, try to re-route the coax, or just turn the FM down, o try turning your modulation down....hope this was helpful....

May 29, 2010 | Cobra 75 WX ST 40-Channels Handheld CB...

1 Answer

Can't talk to anybody, but can hear them just fine.


Could be a few things.One as simple as a bad soilder on the board or your voltage regulator could have went out. If you take the top cover off and talk in the mic and its starts transmitting then you have a bad soilder to check the regulator is a little harder and not for just anyone to do.

May 06, 2010 | Cobra 25 WX-NW-ST 40-Channels Base CB...

2 Answers

Cb is Keying Down instead of keying up when trying to talk


if you are transmitting fine Don't worry about the meter. Get an external SWR meter, they are better anyway.

Also, make sure the the switch next to the meter is all the way up on s/rf setting. thats for signal power and receive strength.

Aug 30, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

COBRA 25 LTD spikes without keying mike


buy a different cobra 25 4 pin mic and try that . If that doesn't work than you inherited a piece of junk .

Jul 29, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

NEED HELP WITH MIC WIRING FOR COBRA 25 LTD ST


1 Shield 2 White 3 Red 4 Black if the radio keys up as soon as you turn it on reverse 3 and 4 I am not familiar with that mic.But the way I actually should have given you the wiring order is as follows:1Shield 2 Modulation 3 and 4 key up I hope this helps.

Feb 18, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Mic wiring for a cobra 85 base cb


Pin 1 is shield, thats the bare wire wrapped around the mic audio wire
pin 2 ic mic audio [usually white)
pin 3 is transmit or push to talk usually red
pin 4 is recieve or speaker complete usually black

Jan 08, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Works sometimes and sometimes it doesnt.


Sounds like a "cold" or broken solder connection on the PC board.

Jul 09, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

No sound


The Cobra 25 requires the mic to be working for any sound to come out. My suggestion is that you first try a new mic. If this doesn't work, look real close at the board on the soldered side ( around the if section, thats the area that right under the waxed area on the component side of the board ) for cold solder joints ( broken lead solder) You may need a magnifing glass. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 17, 2007 | Cobra 25 LTD 40-Channels Base CB Radio

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