When the big anniversary meteor showers appear around, you can generally acquisition us active up to a mountaintop to escape ablaze abuse and watching the skies for a while. But what to do back it’s cloudy? Or back you’re aloof too apathetic to leave your computer monitor? One band-aid is to accept to meteors online! (Yeah, it’s not the same.)
Meteors leave a aisle of ionized gas in their wake. That’s what you see back you’re watching the “shooting stars”. Besides glowing, this gas additionally reflects radio waves, so you could in assumption accept for reflections of earthbound broadcasts that animation off of the meteors’ tails. This is the base of the meteor access advice mode.
[Ciprian Sufitchi, N2YO] set up his arrangement application annihilation added than a bargain RTL-SDR dongle and a Yagi antenna, which he describes in his writeup (PDF) on meteor echoes. The ambush is to acquisition a able arresting advertisement from the apple that’s in the 40-70 MHz arena area the atmosphere is best cellophane so that you get a acceptable signal.
This acclimated to be easy, because analog TV stations would put out hundreds of application in these bands. Now, with the alteration to agenda TV, things are a lot quieter. But there are still a few hold-outs. If you’re in the eastern bisected of the USA, for instance, there’s a transmitter in Ontario, Canada that’s still broadcasting analog on approach 2. Simply point your antenna at Ontario, aim it up into the ionosphere, and you’re all set.
We’re absorbed in anyone in Europe knows of agnate able emitters in these bands.
As you’d expect, we’ve covered meteor access before, but the affluence of accession provided by the SDR Yagi band-aid is ridiculous. And speaking of ridiculous, how about communicating by bouncing signals off of casual airplanes? What will those ham radio association anticipate of next?
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