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

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No sound people can hear me on my cobra 18 wx st 2 but i cant hear them

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  • yxlasse Mar 01, 2009

    cobra 18 WX, no sound from unit when in am mode only sound from speaker when in WX mode transmit is working though...

  • Anonymous May 08, 2009

    I dont get any reception in RX mode, and when I key the mic a strong signal registers on a seperate radio I have in my truck, but no voice sound comes through. I know both antenna's and the radio in the truck are good. WX mode works and sounds great. Any ideas?

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

Posted on Feb 01, 2009

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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 18 wx st, Rx & Tx is ok but no modulation


Hi, my name is John. Welcome to FixYa..Try a different mic., if that fail,s, we need to look at your audio chip, also a few capacitors..let me know , we are always here to help you. thanks for choosing FixYa...John

Nov 20, 2010 | 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

I have a red orange and black wire i need to know what the orange wire is


hello, in my Cobra 18 WX ST II the orange wire goes to "mic2" on the circuit board the other end runs to pin # 2 on the mic jack

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

1 Answer

My 18 WX ST keeps blowing fuses


sounds like its been hooked up backwards,the resistor is goig to need to be changed.

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

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

Cobra 75 wx st everything seems to work eccept receiving signal meter will spike on trx and it seems to receive but no sound there is sound in wx mode


WX is for weather. If you put it on WX, and you do not hear anything, then you need to change the weather station it is on. in wx mode, you change weather channels by pressing channel up and down. To communicate with 2 way, press the cb/wx button so it is on CB mode.

Sep 28, 2009 | Cobra 75 WX ST 40-Channels Handheld CB...

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

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