Minor Update Available for Portsdown 4

[G8GKQ]

I have just issued a minor software update for the Portsdown 4 (Raspberry Pi 4-based).

The title of the update is "202011290 Reduce EasyCap Contrast", and that is exactly what it does. During testing of the Raspberry Pi based video source (to be described in the next CQ-TV) it was noticed that the EasyCap input to the Portsdown crushed the whites on a full 1v p-p composite video grey scale on transmission and streaming. This update corrects that error, but may cause your current system contrast to reduce (by about 15%).

If your contrast is reduced, I would encourage you to correct your video level; however, if you set "contrast=464" on line 84 of rpidatv/scripts/a.sh https://github.com/BritishAmateurTelevi ... s/a.sh#L84 you can get back to the original setting.

No need to take this update if you are happy with the composite video pictures from your Portsdown.

Thanks to Clive G3GJA for alerting me to the problem.

Dave