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

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I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a different mic and got the same result except when I turn the squelch all the way down and a little above its makes a weird noise. When i press the call button with both mics the TX and the RX lights come on but the power bar shows nothing. Any ideas?

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That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

See if you have a carrier...signal going out, but no modulation. Get your Tech to check the mike wiring/circuitry inside the radio, also.

Posted on Sep 01, 2010

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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.

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

1 Answer

I am able to transmit but not able to receive on this model and the squelch is very low, can you help me resolve? I am not receiving any weather transmissions either.


Hi, my name is John. Check your antenna that it is getting a good connection,and that it is grounded. Turn your RF GAIN to MAX. Turn squelch all the way to the left. To hear Weather, Press the Weather button. hope this was very helpful.....rate this solution on the four thumbs-up.....John

Sep 08, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

2 Answers

Cobra 18 wx st receives-wont transmit


Take the cover off, flip it over solder side up, check all solder joints for cracks, cold solder joints, check the safety diode where it comes in the radio, before I go further, can you pick up the weather channel?...Does the PA work?...need to check the pre-driver and finals,audio chip, hook up the power meter using a coax three foot jumper from the output from radio to the input of the watt meter, then the antenna, first check the SWR, on the scale on the meter to cal/swr mode,adjust it to spec, then while still keyed down turn the dial to SWR,if it is the safe range your ok,then turn the Dial to 10 or 20 watt scale and key the mic. Does it have any wattage? If not suspect the finals, they are located on the back rail, if it does have RF then its the audio chip, its located on the right side rail facing you,closest to you.remove it and replace it with same ....hope this helps....

May 21, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

3 Answers

My 18 WX ST Cobra CB radio will allow me to receive sound from the 3 weather stations it has on it, but I cannot pick up sound from other CB radios. help please?


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

Nov 03, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

I can't xmit or receive on CB channels: Wx channels come in OK. I had a bad WalMart Special mobile antenna which shorted out because of corrosion. Now have a Diesel 15 inch mobile with tunable SWR tip....


If try another mic and see if problem is still
there then you have half of the problem,the
TX an RX all go through the mic if mic good
you will have to go inside of the unit.
Good Luck

Sep 10, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Cobra 75 wx st


Hi and welcome to FixYa,

Initially, pls a couple of ideas you may want to consider/explore or try/check:
  • PA/CB switch must be to CB;
  • RF Gain max clockwise;
  • Squelch counter clockwise;
  • Volume to your desired level;
  • Mute (off);
  • external speaker/speaker connection;
  • audio amp, verify if there is TX modulation;
  • antenna, antenna cable. SWR should be low.
Good luck and Thank you for using FixYa. Happy New Year.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate this at all. Cheers.

Jan 01, 2009 | Cobra 75 WX ST 40-Channels Handheld CB...

2 Answers

Cobra 18 wx st rf/s-meter does not function


Sounds like the radio is working meter I
would think is bad you could replace it or
run as is.
Maybe this helped

Dec 25, 2008 | Cobra 18 WX ST 40-Channels Base CB Radio

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 | Radio Communications

1 Answer

Transmits but doesnt receive


If the meter shows that it's receiving something, the microphone may be the problem. Another possibility is the speaker & plugging an external speaker in would confirm this. Aslo make sure the squelch control is turned all the way to the left (counter-clockwise) & the RF gain is turned to the right (clockwise).

Jul 18, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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