I've had these lines (every 8KHz) ever since I've used HDSR. I had them with the rtl dongle and now using an AirSpy with Spyverter. I use HDSDR as a panadapter for an Icom receiver so I've learned to live with them. But I'd like to figure this out. I use shielded USB cables with choke for connection, but I've always assumed it's some form of interference. They are consistent at 8KHz intervals.
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