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filter ringing

Greg
Greg Member ✭✭
edited 2020 05 in SmartSDR for Windows
In doing a side by side comparison with my K3 I notice the narrow filters on the 6700 (50 Hz) have a hollow ringy sound to them. At 200 Hz they sound pretty close. 73 Greg

Answers

  • Gerald-K5SDR
    Gerald-K5SDR FlexRadio Employee ✭✭
    edited 2019 14
    Turn the AGC-T down. I tried the 50 Hz filter with the AGC-T set for best SNR and the filters sounded perfect. Sounded like a code practice oscillator. If you have the AGC-T too high, you are filling the filter with noise.
  • Greg
    Greg Member ✭✭
    edited 2019 14
    Doesn't that inhibit the ability to work weak signals? 73 Greg
  • DonS
    DonS Member ✭✭✭
    edited 2020 05
    My experience has been this process reduces the noise to make the signal more copyable
  • Greg
    Greg Member ✭✭
    edited 2013 01
    I think something has changed in the DSP. The NR seemed more effective in ver 0.16. Also the slider setting have no effect here. Greg
  • Jeffrey Kerber, N3VE
    Jeffrey Kerber, N3VE Member ✭✭
    edited 2018 14
    Same here the slider has no effect. Jeff N3VE
  • Gerald-K5SDR
    Gerald-K5SDR FlexRadio Employee ✭✭
    edited 2016 04
    Just the opposite. It will actually improve signal to noise. You want to set the AGC-T so that you hear the noise but the filter does not ring if you are doing weak signal work. A signal at MDS will be equal to the noise and you will be able to hear it much better than you would with the AGC-T set too high.

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