Rafael Diniz

Rafael Diniz holds a BA in Computer Science from the Campinas State University(UNICAMP) and a Master’s degree in Informatics from the Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Brazil. He is currently a PhD candidate at the University of Brasília. Rafael has experience in the areas of digital TV and radio (broadcasting), HF radio technologies, hypermedia and multimedia systems, computer graphics and electromagnetic spectrum management. Mr. Diniz is a member of the Saravá colective and supports the free/community radio and TV movements in South America. In the 2000’s Rafael participated heavily in the Brazilian Indymedia network and the free software movement. In the 2010’s Rafael worked on the development and installation of the first community DTV ISDB-T channel in the world, broadcasting from Buenos Aires on channel 20, and in the deployment of two digital HF networks in the Amazon Forest region of Brazil with dozens of stations.


Doing long distance digital links using the HF radio band / Rhizomatica's HERMES project in Mexico
Keith Whyte, Rafael Diniz

In this talk we will present the system we used in the HERMES (High-frequency Emergency and Rural Multimedia Exchange System), winner of the Off-the-Grid Internet Challenge of Mozilla WINS Challenge.

At HERMES demonstration in Mexico the system was composed by a couple of ICOM IC-7100 radios (100W peak output power), doing NVIS (Near Vertical Incidence Skywave) skywave communication between a community in the mountains and capital of the state. An SDR modem designed to be used with standard HF transceivers, and the software to connect everything (including the Osmocom GSM stack) together with a GSM BTS were assembled to provide emergency communication to any isolated place.

Main Room