Question about Maxon MCB-30 40-Channels Base CB Radio

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When I Press the mic to talk, others hear me key down, but no sound is transmitted

I have a Maxon MCB-30. When I push the button to talk, the TX light lights on the unit, others say they hear a click, but my voice is not transmitted. I can hear them fine, but no sound comes through to others. Any ideas?

Thanks,

Chuck

Posted by on

  • lummox30 Nov 08, 2008

    I did check the mic in the end. There was a broken wire which I repaired. The unit is working now. I just hope the repair lasts.



    Thanks for your help though, I appreciate it.



    Chuck

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Hello lummox30,

Check you mic first to see if it is indeed working. Then if it is the below advice is applicable.
It sounds as if your TX audio amplifiers might be malfunctioning or the TCXO might be bad. If you have a background in Electronics I would suggest that you open up the unit and using a dummy load on the antenna check the two TX audio amps to see if when you key the mic and speak into it the amplifiers are amplifying your voice and sending it to the modulator. If the problem is not amps or the filters in between the amps, the modulator and the VCO buffer are suspect. If the TCXO is being modulated I would check the PPL IC and the Drive amp to see if the modulated signal is getting through. The last two checks I would perform are on the final amp and the TX switch prior to the antenna jack.

If you do not have a background in electronics, still check your mic, but the rest of the above advice can be done by a qualified Radio Technician.

I hope this helps,

Thank you,

Shuttle83

Posted on Nov 03, 2008

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