04-04-2017, 10:47 PM
My random thoughts again... I'm wondering if some of the perceived deficiencies of 625 were because it was at UHF, & the signal wasn't as strong as 405 was on VHF, so the AGC would be working flat out. Would we have noticed such a big difference if 625 was at VHF like Ireland? IIRC mean level AGC on positive modulation would result in the highlights not being bright enough, the blacks not being dark enough & the screen being mid grey when when it should be all black. What effect did mean level AGC have on a negative modulation picture? Was it highlights too bright & blacks too dark? I just can't remember.... What effect did AC coupling have?
