Since we really need some other data radio options in the hobby, I wanted to mention LoRa. It's a chirped spread spectrum technology used for low power WAN applications, with air transfer rates: 300bps-31.2Kbps. There are 433 MHz modules, as well as 900 MHz and 2.4 GHz. As a staring place, WA2KWR has some code here: https://github.com/fcolumbu/LoRa_Projects/wiki Steve, KB9MWR