extracting H/V sync from sync-on-green video signal?

[Dan Williams]

On Sun, 30 Jan 2005 14:38:59 +0000, Jules Richardson
<julesrichardsonuk at yahoo.co.uk> wrote:
> 
> does anyone happen to have a schematic for a simple circuit to extract
> sync information from a sync-on-green video signal?
> 
> I've got a screen here I'd like to hook up to the Tek (I left the normal
> monitor I use with the Tek at Bletchley), but it needs either seperate H
> and V sync lines hooked up, or composite sync - it won't do sync on
> green (which is all that the Tek provides).
> 
> I keep on finding sync combining circuits that'll do seperate sync to
> sync on green everywhere, but nothing to do the reverse!
> 
> cheers
> 
> Jules
> 
> 
I don't know if this is any help, but I bought a vga adaptor which has
both a male and female vga connector and converts sync-on-green both
ways. I will try and find the name of the company I bought ift from,
it was only about $45 including postage from the US.
It has worked for me using any combination of pc, sun. dec and sgi
monitors and machines. I have thrown at it.

Dan