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Wide SSB

I saw a video (which I can't find anymore) about a feature in SmartSDR that allows a wider SSB signal that is supposed to be upwards of 3db increase in apparent signal. Does anyone know how that is set up and how it is supposed to work?


  • KD0RC
    KD0RC Member, Super Elmer Moderator
    edited April 2022

    Hi Cy, there is confusion over CESSB (Controlled Envelope Single Sideband) and ESSB (Extended Single Sideband).

    ESSB is just a wide signal and does not have any signal increase on its own.

    CESSB is the method invented by Dave Hershberger, W9GR to give a nearly 3 dB increase in average power with only 1.6% added distortion. This is the method used by Flex. To enable it, turn on PROC. You get more compression as you change from NOR to DX and on to DX+.

    The 2.8 is dB increase in average power (Peak Envelop Power or PEP stays the same) is like having a nearly 200 W radio.

    Because the distortion is so low (unlike analog compressors from the past), I tend to keep it on all the time.

    There is a great video by Dave Hershberger explaining CESSB:

  • Cy Stanway
    Cy Stanway Member ✭✭

    Excellent! Thank you!

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