A French company Watteco has developed a new powerline modem based on Watt Pulse Communication (WPC) that transmits across the 2 - 4 MHz segment of the precious HF spectrum.
The small, low cost, low power consumption modem can be used for any type of data communication.
Designed for low data rate (10kb/s) applicatications such as Smart Meters, Home Control and Street Lighting it transmits a wideband signal across 2-4 MHz completely covering the Amateur Radio 80m band.
Watt Pulse Communication (WPC)
http://hal.archives-ouvertes.fr/docs/00/49/
34/35/PDF/hal.pdf
Watteco
http://www.watteco.com/
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