Re: VLF Sunrise Sunset effect at VLF using SDR and "LIL" Low Impedance Loop
Jean-Marie Polard <contact@...>
Here is such a plot of amplitude of DCF77 during half night and sunrise (a time signal vlf station in Germany) done with vlfrxtools of Paul Nicholson. But with Spectrum Lab one can do the same. Received with an UMC202HD usb soundcard and earth probes antenna
73's Jean Marie F5VLB
Le 08/07/2021 à 07:11, jdow a écrit :
That brings to mind a possibly interesting feature for people into observing changes in propagation would be a means of creating VERY slow waterfall images, once a second, once in 10 seconds, once a minute, once in ten minutes, etc, probably in a traditional 1,2,5,10 sequence. Then you watch the pips move and change with time. With a fine enough spectrum plot you can possibly actually see the frequency changes as the ionosphere moves up and down and the D layer comes in and out. It could be used for education.
-- Jean-Marie Polard F5VLB http://www.polard.fr/