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Digital Mode PSK-31 has Multiple Identical Streams in DM780 SuperSweeper

Member ✭✭
edited November 2018 in SmartSDR for Windows
Running 1.0 with Win 8 and DM780 using SuperSweeper in PSK-31. I observe multiple ribbons (limited to two, so far as I can tell for now) of the same communication offset by several hundred hertz. The distance in hertz between the identical ribbons is different for different signals. I've not seen this before. The two streams are not together in time; that is one lags the other. Conditions are quite good on all the HF bands. I'm making this observation on 14.070 today, 14 October 2013, aprox 1600z and later when I started operating. It is just possible there is nothing amiss in the equipment and software and the cause is long-way/multi-path/LDE slightly shifted in frequency by doppler or ?? I await responses. --Jim, W5HFS

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Answers

  • Member
    edited November 2018
    Jim: I have observed the same multiple ribbons on the PSK-31 mode using DM 870. This has appeared since using the latest version of HRD. I turned DM 870 off and started FlDigi. The multiple ribbons did not appear. I have observed multiple carriers spiking across the waterfall when a strong digital signal is received. These issues appear to be present in the new versions of HRD. I will keep tracking your community tag to see if anyone using HRD are having similar issues. Bill W4EY
  • Member ✭✭
    edited July 2016
    Thanks. Please note that I am not using HRD, only DM780. --Jim, W5HFS
  • Administrator, FlexRadio Employee admin
    edited March 2017
    I do not see this reported behavior with other digital mode programs.

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