"Turn your waterfall gain down (top left slider) and it will clean it up mostly. I have a +20 dB SNR file and it is awful looking until you turn the gain of the waterfall down."
Thanks for the tip. I have viewed many much stronger signals using the same waterfall setting and have not seen similar signal artifacts. Also, I observed no direct correlation between reported S/N and the level of the signal artifacts. I'm not convinced waterfall gain is implicated. I looked at the 180000 file using Audacity spectrum analysis. I did not see the clear discrete frequencies that I was expecting but I have not compared with a clean SF signal yet. The artifacts may, as previously suggested, been due to a propagation anomaly. However, I still suspect the artifacts were in the transmitted signal. Only K8R operators would know if there were any changes that could account for the differences. I have made three screen captures, and all the audio files for this receiving session, available on dropbox at https://tinyurl.com/bdeeexez I am not asking for any developer involvement as the signals decoded normally. I'm only posting the data as a few have expressed interest. 73, Andy, k3wyc
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