Ken W6HHC has updated the NOTES.txt file (aka README) on the http://www.DATV-Express,com web site to describe three known problems in v1.23 of the Express_DVB-S_Transmitter software for Windows. These three known problems are:
- * Windows-for-Italian OS does not select capture-camera properly because of use of a "Italian-friendly" setting name. Using vMix should be a work-around.
* Windows-for-Japanese OS does not select capture-camera properly because of use of a "Japanese-friendly" setting name. Using vMix should be a work-around.
* The MER readings using MiniTiouner receiver for DVB-S2 transmissions appear to read "lower" in value than when using the DVB-S protocol. Due to an "unknown reason", the 32APSK modulation will not decode on a SatLink Analyzer unless the DATV-Express software has modified the 90 symbol preamble magnitude on the DVB-S2 frame. The received DVB-S2 signals are still very robust.
Ken W6HHC reports that he has started to test the Portsdown Project from BATC with a configuration set-up of:
1) Raspberry-Pi-3 with LCD Touchscreen display
2) BATC-customized RpiDATV software from Evariste F5OEO
3) A DATV-Express board as the modulator and frequency selector
Block Diagram of a Typical Portsdown set-up for using the DATV-Express board for DVB-S modulator.
The LCD Touchscreen is the normal GUI.
Charles G4GUO is continuing to take a break from the DATV-Express efforts and is involved in two long-term efforts:
1) A very complex Digital-Pre-Distortion research effort that will use CUDA video board to perform high-speed math and initially use the LimeSDR board to transmit.
2) Has become part of 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.
No new major releases of DATV-Express (even alpha) are expected to be available until the launch of Es'hail 2 sat in 2018.
“Project speed set to slow”….de Ken W6HHC