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

4 Answers

Cobra 18 wx st cb problem

I recently installed this cb in my 1999 ram witha new single whip antenna from radio shack. The problem is in cb mode nothing happens. The signal strength bar stays with only one light lit, even with the mic keyed. The weather bands work great. Any ideas what could be causing this?

Thanks,

Brandon

Posted by on

  • fblawton Mar 16, 2008

    I just got a single whip antenna, I do not know how to match it. I do not have a swr meter but I adjusted the height of the anetnna up and down and it made no difference.

  • Dean Dishman May 11, 2010

    Did you match the antenna to the radio? What is your S.W.R. ( Standing wave ratio)??

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Check the swr on the antenna, if you have the wrong antenna, it wont work

Posted on Oct 24, 2009

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What is the meter set for? to see your signal it need to be on signal. The meter has 3 functions.

Posted on Oct 03, 2009

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You have to check the swr reading. Sounds like your antenna is shorted out. Probably at the mount. Main antenna can't touch ground.

Posted on Sep 16, 2009

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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.

Posted on Sep 05, 2009

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1 Answer

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.

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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...

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Where can i get tuneup specs for Cobra 18 wx st extra low modulation


The cobra 18 wx st is the worst radio Cobra ever made. I don't know why they still make it. It's not gonna do much no matter how much you tune it up. Its a bad radio.

Get a cobra 29, and turn VR4 all the way counter clockwise.
(this will not work on the 18)

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1 Answer

What is the best antenna for this unit that is around 20$


This radio is the worst radio cobra ever made. It won't really matter what antenna you put on it.

But your not gonna get one that's any good for any radio for around $20.

You can pick up a decent fiberglass whip for around $20, that's about it. You will have to mount it with a hard mount though. If you want a decent mag mount, you going to spend at least $60 to $80.

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get an swr meter and check your antenna first. if good problem may be in the circuit board.. they are famous for loose IF, TX mixer boards. or call us

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MAKE SURE THE ANTENNA IS NOT CONNECTED, THEN TRY AND SEE IF RADIO POWERS UP, IF IT DOES NOT THEN YOU DO NOT HAVE PROPER GROUND
ALSO ARE YOU USING THE COBRA STOCK MIC ?
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1 Answer

Same problem


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.

Aug 21, 2008 | CB Radios

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