blinry
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!
blinry
30: Assess the propagation of radio waves using beacons
The International Beacon Project runs a network of 18 stations, which take turns transmitting their callsigns at certain frequencies.
Using this system, you can quickly get a sense of how well radio waves are currently propagating to your location. Clever!
I picked up the beacon from southern Finland! You can see its callsign scrolling away in the video. It's followed by four dashes send with decreasing power. I only heard the first one…
blinry
29: Listen to CB radio
After I looked into the low frequencies yesterday, let's go to a higher band again: The Citizens Band!
This is the third frequency band I'm aware of where anyone is allowed to transmit – provided that you use a licensed device!
This is a band where my random wire antenna really comes in handy. Without it, I would have a hard time understanding anything. And even with it, transmissions are extremely noisy.
CB radio is used internationally, especially by truck drivers?
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