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For example a simple WSPR beacon can be built using the Si 570, [5] or Si 5351. [6] The Raspberry Pi can also be used as WSPR beacon. Density distribution of WSPR spots, January 2014 vs July 2014, using only most distant reception per spot. An accurate clock is essential both for transmission and decoding of received signals.
A large-scale beacon project is underway using the WSPR transmission scheme included with the WSJT software suite. The loosely coordinated beacon transmitters and receivers, collectively known as the WSPRnet, report the real-time propagation characteristics of a number of frequency bands and geographical locations via the Internet.
The beacon and a number of other South African stations are running WSPR mode for experimental purposes. (WSPR is configured as Dial Freq USB 5287.2 kHz TX Freq 5288.7 kHz, which is within the channel allocation) 5290.0 kHz: South Africa: ZS1OA: JF95fx: This is a permanent WSPR beacon located at Cape Town. 5291.0 kHz: Switzerland: HB9AW: JN47be
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FSK441, introduced in 2001 as the first communications mode included with WSJT, [3] is designed to support meteor scatter communication using radio-reflecting meteor trails. [2] The bursts of signal created by such trails are commonly referred to as "pings", due to their characteristic sound.
A panel of global experts explains why BMI is not the most helpful measurement of body weight, and how else doctors can diagnose obesity. Image credit: VICTOR TORRES/Stocksy.
But for the sake of argument let's just assume the width is 3 miles/5 kilometers, and that the airplane remains in that zone for the entire two minutes a WSPR transmission is happening. Assuming spherical airplanes, the area the airplane is capable of occluding at any given moment is approximately 31400 square feet or 2826 m^2.