ARLA/CLUSTER: Dx com miliwatts em 868 MHz

[João Costa > CT1FBF]

 Milliwatt DX on 868 MHz

*Priyanka Garg* writes about some spectacular DX achieved by LoRaWAN
Internet of Things enthusiasts using just 25 milliwatts ERP in licence
exempt UHF spectrum

She reports that on July 8, 2018 LoRaWAN packets transmitted by the gateway
of *Ryan Walmsley*, member of The Things Network East Coast, Great
Yarmouth, was received 235 km away in Utrecht, Netherlands.

On reading Priyanka's initial post the Sheffield Hardware Hackers and
Makers let her know of even greater DX over a path of approximately 466 km
that they had achieved on June 6, 2018.

Members of the group operated from Barrow Stones in the Pennines near
Manchester, about 600m ASL. Most of the LoRaWAN packet transmissions were
received in the local area out to as far as Leeds but one went much
further. A packet was received at the Delft University of Technology in the
Netherlands, a remarkable achievement for 25 mW ERP on 868 MHz. See the map
of where packets were received at
https://ttnmapper.org/special.php?node=1279_b370&date=2018-06-06&gateways=on

Read Priyanka Garg's article on the ducting that produces these long paths
https://www.thethingsnetwork.org/
article/atmospheric-duct

LoRaWAN overview
https://www.thethingsnetwork.org/docs/lorawan/

Ryan Walmsley
https://twitter.com/ryanteck
https://ryanteck.net/my-ultimate-lora-gateway-backplane/

Sheffield Hardware Hackers and Makers
https://twitter.com/shhmakers
http://www.sheffieldhard
warehackers.org.uk/wordpress/

The Things Network East Coast
https://twitter.com/ttneastcoastuk

Radio amateurs also make use of the 868 MHz band. In 2014 *James Coxon
M6JCX* gave a presentation to the RSGB Convention in Milton Keynes about
his work in developing UKHASnet in the band. UKHASnet is a UHF mesh network
using low power licence exempt wireless modules for Gateways/Repeaters and
High Altitude Balloons, see
https://ukhas.net/
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