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How Does This Work?

When a meteor enters the Earth’s upper atmosphere it excites the air molecules, producing a streak of light and leaving a trail of ionization (an elongated paraboloid) behind it tens of kilometers long. This ionized trail may persist for less than 1 second up to several minutes, occasionally. Occurring at heights of about 85 to 105 km (50-65 miles), this trail is capable of reflecting radio waves from transmitters located on the ground, similar to light reflecting from a mirrored surface. Meteor radio wave reflections are also called meteor echoes, or pings.

In order to listen to meteor echoes, you need a powerful transmitter in VHF band (ideally a tower broadcasting analog TV on a channels 2-5) located not too close but not too far either from you, a TV antenna, a VHF receiver… and patience.

The meteor detector at LIVEMETEORS.com is located in DC Metropolitan area and is currently pointing the Yagi antenna at a TV tower in Canada broadcasting on channel 2 analog TV, around 55.24 MHz, or based on availability and propagation on channel 3 analog TV, around 61.260 MHz, likely located in Timmins, ON. Receiver is RTL/SDR and software is SDR#.

Recommended reading:
Detecting meteor radio echoes using the RTL/SDR USB dongle (presented at the Society of Amateur Radio Astronomers Conference – 2015)

July 13, 2020 yo9ilx

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