19-02-2016, 05:02 PM
(19-02-2016, 10:50 AM)Terry Wrote:(18-02-2016, 10:44 PM)Geordie McBoyne Wrote: Some of the later sets were restricted to about 7Mhz.
Any set designed for use in France would have to accommodate the 11.15MHz sound/vision spacing, so there would be no point in truncating the vision IF bandwidth.
I wonder how many sets, of any age, were capable of resolving the full 10.4MHz bandwidth?
This brings back memories of seeing two narrow (half 819-line) pictures side by side on a 405-line set during periods of abnormal reception in the 60s ...!
Hi Terry.
Geordie is correct, many of the later French 819 line sets didn't have the full bandwidth, they were aligned for gain to reduce the component count. We know that the gain would be low due to the wide bandwidth so the early sets had three or even four stages of vision IF amplification to compensate.
I have had a few 819 line sets through my hands and the early sets definitely are better. I can reproduce a full bandwidth 819 line picture here and the difference is very marked between the later cut down sets with a very flat picture.
