HaLow hits record 16km WiFi distance at 900MHz
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Morse Micro has achieved a record 16km distance for a HaLoW WiFi link at 900MHz
The tests of HaLoW WiFi at the rural Joshua Tree National Park in the US covered 16km, up from the 3km shown in January in an urban environment. HaLoW is a variant of the WiFi standard designed for lower data rates and frequencies for the Internet of Things and the Morse tests achieved a data rate of 2Mbit/s.
The tests used an evaluation kit as an access point (AP) at the edge of a quiet rural valley. The off-the-shelf MM6108-EKH01 evaluation kit is based around a Raspberry Pi 4 with the Morse MM6108-MF08651 Wi-Fi HaLow reference module.
The evaluation kit outputs 21 dBm (125mW) through a standard 1 dBi low-gain dipole antenna, resulting in a total radiated power of 22 dBm without tweaking the 802.11ah parameters to increase the range or using high-gain directional antennas.
The Morse Micro chips adhere to the 802.11ah standard that specifies a slot time of 52µs. Morse Micro’s implementation allows for a maximum time of flight of 53µs to allow for slight variations between devices. This results in a theoretical maximum range of 15.9km (approximately 10 miles).
In theory, Morse expected to a link at a sensitivity of -95 dBm, which provides a throughput of 4.5 Mbit/s or a UDP MAC throughput of 4 Mbit/s. The tests at the Joshua Tree National Park achieved a stable connection of 2Mbit/s UDP throughput at 15.9km.
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