Question about Cobra 75 WX ST 40-Channels Handheld CB Radio

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Cobra 75 wx st no sound/speaker does not work. Everything else seems OK according to display

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Hi, my name is John. try putting a external speaker in back of radio and see what happens, might need to replace internal speaker, or something internal. Let me know, I will post the process here......Hope this was helpful..

Posted on Sep 02, 2010

  • Mohsen Nov 06, 2010

    Yes. I did stick a skeaker on the back of radio, small sound and then nothing. Where could I send it for repair?

  • JOHN BABA Nov 06, 2010

    How many ohm was the speaker?

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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...

1 Answer

Cobra 75 wx st fuse keeps blowing. As soon as I plug the transceiver into the connector box the fuse blows.


Hi and welcome to FixYa,

Initially, check the reverse protection diode, D18 (1N4004). It would be located / connected at the power board of the DC connector.

Good luck and thank you for asking FixYa.

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

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

Stops working when I try to transmit.


problem may be the button loose connection to the main board...we can fix these radios. cb shop temple, tx on yahoo search. The button is connected in so it controls both sections.

Aug 03, 2009 | Cobra 75 WX ST 40-Channels Handheld CB...

1 Answer

No sound


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

Jan 24, 2009 | Cobra 18 WX ST II 40-Channels Base CB...

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 75 WX ST 40-Channels Handheld CB Radio manual/antenna


Hi - You can download the manual from the link underlined in blue below:

75 WX ST

Other info here.

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Please take a moment to rate this solution & let us know if the information given was useful to you - Good Luck!

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Aug 31, 2008 | Cobra 75 WX ST 40-Channels Handheld CB...

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