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ADRCS has posted an extensive update to their ongoing IP400 project. The updates, currently in beta testing, aim to bring mesh networking to any off the shelf radio. A new OFDM data mode will push data rates up to 57 kbit/s.

The firmware, now known as the Unified Firmware Platform (UFP), adds Orthogonal Frequency Division Multiplexing (OFDM), a modern-day technique that is used in cellular telephony, cable modems and digital subscriber lines. Although in those applications is uses direct on-air modulation, for amateur use it was implemented to operate within the bounds of the audio range of FM transceivers, therefore designated as OFDM-AB. By selecting a bandwidth that is matched to the radio capabilities, coupled with various data constellations, rates from as low as 2600bits/second up to as fast as 57000 bits/second have been realized.

For a deep dive into these developments, see the most recent issue of Zero Retries. Steve Stroh (N8GNJ) provides a detailed introduction to the entirety of the IP400 Project.

Source: ADRCS