Do a Google search for "Digisonde" for additional info. There are hundreds of 'em. They play an important role in the WWV predictions.
FWIW, I used to work at the University of Colorado's radio astronomy department ... right across the street from NBS. On Sun, Oct 29, 2017 at 4:37 PM, Drew AF2Z <[email protected]> wrote: > There are ionospheric chirp sweepers that go through the hf spectrum every > couple of minutes. They sound like someone lightly clearing his throat. > Have no idea what it looks like on the pan display. On a given frequency > you'll hear the chirp at the exact same time every couple of minutes > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
