What is the DW button/switch for on the Cobra 18 WX ST II?

Cobra 18WX ST II

Probably to Chassis Ground. You may want to experiment with the resistor value if you use a power mic. A 100 Ohm resister may be too low a value and cause audio feedback if you do use a power mic.

if you replace one you should replace both ,driver and final.

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.

Sounds like thc CH. Selector switch needs cleaning, or there may be a bad connection....in some cases a poor solder ( cold solder ) connection can do this also.

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

Try pressing the emerg. or Cha.9 button....hope this helps...

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.

This is for the Cobra(r) WX ST II
closest to the model # you gave.
Are you certain of the 18-r you posted??

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