31: Receive a time signal
I would've loved to receive DCF77, which powers the radio clocks in Germany! But no matter how hard I listened to 77.5 kHz, there was nothing there. I don't think my dongle can do that.
So let's use higher frequencies! Russia transmits its "RWM" time signal at 9996 kHz, which beeps every second, with a long beep for the full hour.
Not enough to tell the time, but enough to adjust your wrist watch, I guess!
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