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

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

Unit will receive and transmit but meter does not respond at all

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This model was so poorly soldered in the factory that many, if not most, have problems.
There are dry / poor solder joins all over the board.
I fixed mine by reheating or resoldering all of the joins connect the vertical daughter boards and then working my way through the rest one area at a time.
This bought back RX on the CB band, improved RX on the WX band, and got the meters working again.

Posted on May 03, 2012

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

Posted on Sep 16, 2009

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1 Answer

I need a schematic for the Cobra 18 wx st. I see them for the st 2 but not the plain version. I have no receive on CB position. I have resoldered all the vertical connections and tried a different mic. ...


start unsoldering you final , check it for proper voltage. then do the same for the driver. Check the voltage regulator. make sure you have the proper out put voltage in the vco section before doing anything. Also make sure you are on frequency.you more then likely have a short somewhere in the receive section and you are just going to have to break it down area by area , transistor to ICs .Its going to be painstaking but you will find it.

Aug 05, 2013 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Cobra 18wxst11 modulation limiter removal


another radio showing transmit on one channel recieve on 10 meter.

Feb 01, 2013 | Cobra 18 WX ST II 40-Channels Base CB...

1 Answer

I am able to transmit but not receive


get another that only receives and no transmit.hook them up together .one on top of the other .I have a friend that did this and it actually worked

May 30, 2012 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

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)

VR2 is modulation in the 18 wx st. adjust it while checking on a watt meter to see when its all the way up.

Sep 20, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

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...

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

1 Answer

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


to be sure that u dont burn yr radio try to check yr swr with an external meter to be mounted between the radio and the antenna and check if it works! good luck.
rgds stefano

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

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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