[Skimmertalk] Heat plots of RBN data by DJ1YFK

[Bob Wilson, N6TV]

DJ1YFK has generated online "heat maps" showing the on-the-air activity of
any callsign ever spotted by the RBN, going all the way back to January,
2015, in a calendar-style format.

For example, try https://foc.dj1yfk.de/activity/ja1nut

You can type any callsign at the end of the URL, or in the search box on
the bottom of the page.  And it is FAST.

Very impressive.

73,
Bob, N6TV