locked Re: Curved Line in Waterfall

Dave (NK7Z)


It looks like a carrier started at the bottom of your screen, (or you came upon it at that point), at around 1230 Hz, higher than your dial frequency, and over the period of one minute moved upwards in frequency. This assumes the graticule marks are 100 Hz apart, and 15 seconds apart on the vertical.

This could be pretty much anything, heater, thermostat, controller for stoves, etc... All you really know is some signal moved up in frequency across a one minute period.

73, and thanks,
Dave (NK7Z)
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 5/10/20 9:17 AM, Brian Wilkins wrote:
I was listening on 17m today. What causes this curved line in the waterfall?
 Link to picture
Brian Wilkins

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