Much of that interference has been reduced, but not all.? Big step was making sure to place ferrite snap cores around all the cables.? I tried both a linear based power supply and switching with no difference as each has the two ferrite cores.? What might be done about the PC supply (other than changing it as I don't have? a spare)?
I'll see if I can give the short audio cord a try.
Thanks,
Jon
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On 5/21/21 3:20 PM, vbifyz wrote:
The important connection where the ground loop current is transformed into the interference voltage is from the SR audio output to the soundcard input.
Try using a VERY short audio cable, with good ground connection. I ended up using a separate short thick ground wire going in parallel with the audio connection.
As for the QRM in the video, looks like the PC power supply to me.
I only use linear wall warts with Softrock, it is difficult to find a quiet 12V small switching supply.
73, Mike AF7KR
