Ken W6HHC has spent time to get the Portsdown Project software working on an RPi-3 with his DATV-Express board.

Set-up using Portsdown software on RPi-3 with DATV-Express as modulator using MPEG-2 protocol
Receiver is MiniTiouner. Video source is a Pi-Cam.
The BATC online shop now offers a known compatible model of video-capture EasyCap called the VideoDVR (USB-TV007) for older video cameras (NTSC/PAL). The new low-cost USB-video-capture dongle came in although Ken has not been able to get it to work properly with his Portsdown_RPi-3_DATV-Express set-up, just yet.
Charles is taking a break from the DATV-Express efforts and continues some efforts with the team working on the USA Phase 4B geosync satellite project that will use DVB-S2X protocol primarily for data transmission of voice, JPEGs, and TCP-IP.
“Project speed set to slow”….de Ken W6HHC