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Hello Al,

I have used RTL SDR SCANNER with an +125MHz upconverter, and I have tested it with two different sinus generators from 0 up to 30MHz, but on the spectrum results, there is always a stray line above each wanted signal lines at exactly +250kHz.

First I suspected my generators (but both with the same symptom doesn't look possible), then the up-converter to do these parasitic lines, but using only the USB dongle (since it starts from 24MHz), the stray lines are still there.

Do you know what could cause that?
Is it due to the program, the sound card or the USB dongle?