<div dir="ltr">
<h1 style="box-sizing:border-box;font-size:16pt;color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;text-decoration-style:initial;text-decoration-color:initial">Milliwatt DX on 868 MHz</h1><p style="box-sizing:border-box;color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:16px;text-decoration-style:initial;text-decoration-color:initial"><strong style="box-sizing:border-box">Priyanka Garg</strong><span> </span>writes about some spectacular DX achieved by LoRaWAN Internet of Things enthusiasts using just 25 milliwatts ERP in licence exempt UHF spectrum<span> </span><br style="box-sizing:border-box"><br style="box-sizing:border-box">She reports that on July 8, 2018 LoRaWAN packets transmitted by the gateway of<span> </span><strong style="box-sizing:border-box">Ryan Walmsley</strong>, member of The Things Network East Coast, Great Yarmouth, was received 235 km away in Utrecht, Netherlands.<br style="box-sizing:border-box"><br style="box-sizing:border-box">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.<span> </span><br style="box-sizing:border-box"><br style="box-sizing:border-box">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<span> </span><br style="box-sizing:border-box"><a href="https://ttnmapper.org/special.php?node=1279_b370&date=2018-06-06&gateways=on" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://ttnmapper.org/special.php?node=1279_b370&date=2018-06-06&gateways=on</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">Read Priyanka Garg's article on the ducting that produces these long paths<span> </span><br style="box-sizing:border-box"><a href="https://www.thethingsnetwork.org/article/atmospheric-duct" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://www.thethingsnetwork.org/<br style="box-sizing:border-box">article/atmospheric-duct</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">LoRaWAN overview<span> </span><br style="box-sizing:border-box"><a href="https://www.thethingsnetwork.org/docs/lorawan/" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://www.thethingsnetwork.org/docs/lorawan/</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">Ryan Walmsley<span> </span><br style="box-sizing:border-box"><a href="https://twitter.com/ryanteck" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://twitter.com/ryanteck</a><br style="box-sizing:border-box"><a href="https://ryanteck.net/my-ultimate-lora-gateway-backplane/" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://ryanteck.net/my-ultimate-lora-gateway-backplane/</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">Sheffield Hardware Hackers and Makers<br style="box-sizing:border-box"><a href="https://twitter.com/shhmakers" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://twitter.com/shhmakers</a><br style="box-sizing:border-box"><a href="http://www.sheffieldhardwarehackers.org.uk/wordpress/" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">http://www.sheffieldhard<br style="box-sizing:border-box">warehackers.org.uk/wordpress/</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">The Things Network East Coast<span> </span><br style="box-sizing:border-box"><a href="https://twitter.com/ttneastcoastuk" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://twitter.com/ttneastcoastuk</a><br style="box-sizing:border-box"><br style="box-sizing:border-box">Radio amateurs also make use of the 868 MHz band. In 2014<span> </span><strong style="box-sizing:border-box">James Coxon M6JCX</strong><span> </span>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 <span> </span><br style="box-sizing:border-box"><a href="https://ukhas.net/" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration:none;word-wrap:break-word">https://ukhas.net/</a></p>
<br></div>