Those frequencies are in the 10-meter Amateur Radio band. My guess is you might be hearing RTTY, FT4, FT8, or other ham radio modes. I wonder if Close Call would trigger on a CW signal?
Those frequencies are in the 10-meter Amateur Radio band. My guess is you might be hearing RTTY, FT4, FT8, or other ham radio modes. I wonder if Close Call would trigger on a CW signal?