Dear all,
here I would like to share some images of my TVs with the ORTF test card that Jac kindly sent to me.
This one needs some alignment, I know...
In high resolution these images would show that the horizontal resolution of the TVs is limited to about 400 TVL while the vertical resolution is over 500 TVL. This is probably due to the fact that more recent 819 sets operated with a limited IF bandwidth e.g. the Radiola has roughly 6Mc and the small TV9-90 most likely even less. It would be interesting to see how the test card would look on an older French TV with the full IF bandwidth. On the other hand older sets may have worn out CRTs so resolution might be limited due to lack of focus in the CRT itself, but this is just an assumption on my side.
Cheers
Semir