02-04-2019, 05:13 PM
(01-04-2019, 01:03 PM)Terry Wrote: Not quite so high as that, Semir!
14MHz is the channel width for system E; vision bandwidth is 10.4MHz.
However, I believe that some manufacturers skimped on the bandwidth in their designs so, if you can find the alignment instructions for this Sony, it would be interesting to know the actual bandwidth it was designed for!
You might find that a 9MHz LPF is perfectly adequate, after all!
Hi Terry,
you are right of course I mixed up the RF and vision bandwidths (it was late when I wrote that post
). Considering that most available 819 line TVs seemed to have cut some corners when it came to IF bandwidths I also think that 9Mhz is probably more than enough and as Jeffrey pointed out the output circuit is probably the smallest problem to deal with in this scenario.Once I get the TV, hopefully in one piece, I will modify one of my modulators to output the correct frequencies for 819 line systems and give the PC generated signal approach a try. All of this is a learning process for me and I am planing to experiment a little.
Semir
