The 10m, 28MHz, band seems rather lively today. I have just a low height wire dipole and am using an AirSpy HF+ but just look at all the visible activity:
(Click to enlarge).
I've often wondered what all those squiggly lines are. They usually, but not always, start and then sweep up in frequency. People have said either that they're high energy particles hitting the upper atmosphere or that they are distant welding machines that can be heard because of good propagation conditions.
It's wonderful to be able to see large parts of the spectrum like this.
1 comment:
Yes rf heating such as used for welding plastic. A sign of good propagation to SE Asia. Not seen as much before lunchtime or late evenings. 73 Brian.
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