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9451Audio VOX module

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  • Andy Talbot
    Mar 2, 2013
      There was discussion here recently on difficulties with automatic Tx/Rx switching, especially via COM ports.   
      Here is a simple and reliable audio relay circuit I use.  It was designed for slow envelope waveforms like PSK31, with a fast attack and 50 - 100ms hang time.   So will work well with WSJT and WSPR .   FSK441 my need the hang time reducing