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Same problem i bought the original cobra 18 WX ST on craigslist, and brand new radio shack antenna, whether signal is great, but i cant hear anything on CB mode. If you find out the soution, please tell me. Thanks

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The Cobra 18 WX ST is made by Maxon & is not particularly well soldered. Most likely cause is a "cold" solder connection in the CB receive circuit on the PC board.

Posted on Sep 05, 2008

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My cobra 18 wx st comes on and goes tru all channels but has no noise at all coming thru it. none of the signal strength lights come on or anything. its brand new.


Sounds like a antenna issue. Make sure coax is in good order.and antenna is connected properly. You might have to get a "swr" meter to put in line between radio and antenna to make sure antenna is "tuned" to were the radio is operating. Radio shack sells a ok low budget swr/power meter.

Nov 09, 2012 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Ok so when I bought my '97 jeep wrangler a couple of months ago it came with a CB. It is all hooked up, came with a huge antenna( 4-5ft maybe), all of the lights come on, the weatherman channel works, and...


check the sw's and the antenna. those are SHORT antennas by cb standards. a 1/4 wave is about 9ft long. a full wave is around 36 ft.. so anything shorter than the 102" whips are prone to have less range. if swr check out. the board on the 18's and 19dx styles need to be resoldered from time to time. simple fix .. don't pay more than $8 to fix the radio...

Feb 01, 2011 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Can hear people talking to me but they cannot hear me.


if this radio is new, return it. Its garbage. Its the worst CB cobra ever made, and one of the most hated.

Still people should hear you. Have you calibrated your antenna for best SWR?

Look in your manual. Read the section on SWR. The antenna needs to be tuned, or your RF energy is not going out of the antenna, and being reflected back into the radio. That's bad.

Jul 28, 2010 | Cobra 18 WX ST II 40-Channels Base CB...

1 Answer

Will not transmit.


if this radio is new, return it. Its garbage. Its the worst CB cobra ever made, and one of the most hated.

Still people should hear you. Have you calibrated your antenna for best SWR?

Look in your manual. Read the section on SWR. The antenna needs to be tuned, or your RF energy is not going out of the antenna, and being reflected back into the radio. That's bad.

And its "Coax" Not co-aux.

Jul 28, 2010 | Cobra 18 WX ST II 40-Channels Base CB...

1 Answer

Cobra 18 wx st for mobile use, ned to switch reg mic for cherokee power mic. need mic diagram for the four pin


You probably don't want to hear this, but the cobra 18 wx st is just about the worst, and most hated radio ever made. Its a very poor radio.

to be very honest with you, you should get rid of that radio, or return it. Then buy a cobra 29 instead,

for proper mic wiring, please reference this page.

Jan 03, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

No sound


Its, either a broken wire in the mic or the internal speaker blew. Try an external speaker then the mic

Jan 24, 2009 | Cobra 18 WX ST II 40-Channels Base CB...

2 Answers

Cobra 75 WX ST 40-Channels Handheld CB Radio manual/antenna


Hi - You can download the manual from the link underlined in blue below:

75 WX ST

Other info here.

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Aug 31, 2008 | Cobra 75 WX ST 40-Channels Handheld CB...

4 Answers

Cobra 18 wx st cb problem


Sounds to me like your finals in the rig have blown stopping you using the CB mode, Either that or you have a loose connection on the power output inside the radio.

Mar 15, 2008 | Cobra 18 WX ST 40-Channels Base CB Radio

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