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Whats the logic for using DIGU instead of USB for FT8. If you use usb with a 4K filter you can see t

N4ABN4AB Old GuyMember ✭✭
edited November 2019 in SmartSDR for Windows
Whats the logic for using DIGU instead of USB for FT8. If you use usb with a 4K filter you can see the whole band and jump any where to transmit.
73 Al, N4AB

Answers

  • George Molnar, KF2TGeorge Molnar, KF2T Member ✭✭✭
    edited March 2019
    DIGU removes any transmit audio processing or shaping, providing a nice clean, flat response for your digital operation. In receive you can also use wider bandwidths - I use 5 kHz on HF.
  • Jamie WW3SJamie WW3S Member
    edited March 2019
    Can use wide bandwidth in digiu as well...
  • Neil D Friedman N3DFNeil D Friedman N3DF Member ✭✭
    edited October 2019
    I find the "wide graph" contained within the FT8 program to be much more useful in finding a free transmit frequency than attempting to use the SSDR screen.
  • VK7WH WinstonVK7WH Winston Member ✭✭
    edited March 2019
    Another reason is that DIGIU turns off all processing
  • VK7WH WinstonVK7WH Winston Member ✭✭
    edited March 2019
    Sorry, I didn’t see the earlier reply.
  • RiaRia Member ✭✭
    edited November 2019
    I seem to remember someone (might have been steve) saying it also had lower latency.
  • Jay NationJay Nation Member
    edited May 2019
    Al
    DIGU / DIGL, and USB / LSB modes on a Flexradio, differ only in the fact that DIGU and DIGL modes bypass any, and all, DSP processing effects. You don't want any EQ-ing, or noise filtering being done on the signals your trying to decode. USB / LSB modes don't bypass those. Think of it as quick, convenient way to ensure that your sending unadulterated signals to the Digital Application your using. The choice is yours though, you can use USB / LSB and disable all the effects manually.

        SDRgadgets

    #FlexRadio IRC Chat

       73, Jay - NO5J

  • Paul LeachPaul Leach Member ✭✭
    edited March 2019
    Brilliant question and good answers.

    It was like asking one of those questions that one is afraid to ask

    I always wondered what the difference was

    Thanks Al

    Paul
  • Jay NationJay Nation Member
    edited March 2019

    Al

    Also, the bandwidth filters are optimized for digital applications when using DIGU, they will either all use a 1500Hz center frequency or will be wide filters that start at 0 Hz and then go up to some useful upper cutoff point, like 3k or wider. Whereas USB filters are optimized for voice operations.

         SDRgadgets

    #FlexRadio IRC Chat

       73, Jay - NO5J

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