https://www.rtl-sdr.com/fingerprinting-electronic-devices-via-their-rf-emissions-with-an-rtl-sdr-and-imagemagick/ IDing various devices by their RFI signature... -- 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Technical Specialist ARRL Volunteer Examiner ARRL Asst. Director, NW Division, Technical Resources