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WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. The program can decode signals with a signal-to-noise ratio as low as −28 dB in a 2.5 kHz bandwidth. [2]
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.
WSJT versions up through 7.06 r1933 (referred to as colloquially as WSJT7) and earlier were aggregations of previous versions, and as such WSJT7 contained 16 different modes (FSK441, JT6M, JT65 variants A - C, JT2, JT4 variants A - G, WSPR, and a preview of JT64A).
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
Typically the DSP based receiver and transmitter modulator or codec is implemented as PC software that uses a sound card to connect directly to an SSB transceiver. Linux implementations are usually called " newpsk " or " newqpsk ".
Recovery crews worked amid freezing temperatures and slushy sea ice Friday to recover the remaining victims aboard a regional airline flight that crashed off the coast of western Alaska.
The 630-meter (or 600-meter) amateur radio band is a frequency band allocated by the International Telecommunication Union (ITU) to amateur radio operators, and it ranges from 472–479 kHz, or equivalently 625.9–635.1 meters wavelength.
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