AncientBrit wrote:...I'll 'port' it to a PIC18F2525 that I have to hand. Graham
Panrock wrote:...I'm still hoping to 'plug in' to your electronic expertise later in the year... Steve O
So I guess you're saying I have signed up for the 405 forum in the past....I did a search on my own name that I may have used as a member log-in, but only yourself and the other two Steves came up.
I wouldn't expect the NBTV section to be too active, my interest would be the 405 part. Not that 405 was ever used in this region, the closest place I know that did use 405 is Hong Kong and much further away, New Zealand.
I assume the 405 colour system is/was the experimental NTSC version with a sub-carrier of 2-odd MHz...I wonder how good/bad it was? Producing a coder for 405 NTSC wouldn't be too difficult.
I spent quite some time on this 625 version yesterday...boy, I tell you, getting the vertical interval correct is doing my head in! I'm tempted to drop the four-field bit and make it two-field. After all it was never meant to be a PAL SPG, just a 625 component version.
Getting timing spot-on involves a lot of calculations (mainly in ones head), it's simple addition and subtraction, just there's a heck of a lot of 'em!
Correct me if I'm wrong...your 120-line system is at 25fps with an aspect ratio of 4:3? As I recall that requires a bandwidth of about 250kHz.
Steve Anderson wrote:I know this is OT, but I assume the 60-odd MHz carrier frequency was allocated by Ofcom and the old 'London frequency' wasn't available.(45MHz).
Steve Anderson wrote:Has anyone designed a converter to do this for TVs with only the one reception (fixed) frequency? I would think a talented Radio Amateur should be able to do this...but that's not me!
Steve Anderson wrote:I'm taking a break from the programming today as I think I over-stressed my limited neuron supply yesterday.
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