GiamMa-based researchers SDR R&D IoT:#Portsdown2020 for the #RaspberryPi3 & #Portsdown4 for the #RaspberryPi4 with the official #Raspberry Pi 7" touch screen. Digital amateur #TV #transceiver #SoftwareDefinedRadio #Rx #Tx #LimeSDR #DATV #DVBS #DVBS2 #DVB