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Voice Operated Squelch

Simon Member
Why not enhance the SmartSDR for 6000 series with VOS.
It cannot be too hard with SDR to add algoritms to mimic a circuit which responds to normal human speech while ignoring other forms of audio. The voice operated squelch exists as a circuit in many commercial HF stations like Motorola's "Constant SINAD" squelch that is used in the Motorola Micom HF SSB Transceivers.
Request For New Feature
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In Review · Last Updated

This is currently an outstanding feature request


  • Norm - W7CK
    Norm - W7CK Member ✭✭

    I asked for this YEARS ago and was told by the owner of Flex that the Flex doesn't need squelch. If you look back through the old posts, you will see I even got chastised for even bringing it up. "Contesters don't use it and therefor its not needed". At the end of a rather sad dialog, It sounded like it was never going to happen. There were lots of very strong opinions in favor of not adding squelch. This makes using all 8 receivers on the 6700 a bit more difficult and not as enjoyable as it could be. There are 3rd party apps that let give you some sort of squelch but not as good as it could be if incorporated right into SmarSDR.

    SmartSDR has been with us for many years now and still lacks functionality in areas that some would consider basics. There are also some fairly important bug fixes that have been on the books forever and have never been addressed....

  • JCP
    JCP Member
    [{"insert":"Back in the 1980's, I worked for Communication Associates Inc. in Huntington Station, NY.\nThey had an excellent SSB Voice Squelch that would detect the human voice, no matter how far down in the mud the signal was.\nBasically it consisted of:\n1) An audio discriminator across the audio band (say 300 Hz to 3 kHz) (generation a DC voltage proportional to frequency).\n2) A 10 Hz low pass filter on the discriminator output (10 Hz is the human voice symbolic rate).\n3) A rectifier after the low pass filter.\n4) And finally a threshold detector on the rectifier output.\nSomething that could easily be added to any modern radio with a little excess signal processing capability.\nJohn WB2CIK\n"}]

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