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NTSC RGB -> VGA

C

Caliban

Jan 1, 1970
0
If I use an LM1881 IC to strip the H and V sync off of an EIA RS170 sync
on green video signal (NTSC?), could I then apply the RGB video lines
and sync signals to a standard LCD or VGA computer monitor?

The RGB video signals are 0.7V analogue, 16kHz Horiz, 720 x 540
dots/lines resolution.

The other problem is finding a source of 12 to 13" Monitors, Google has
turned up a few overseas but none in Aus.
 
C

Caliban

Jan 1, 1970
0
Caliban said:
If I use an LM1881 IC to strip the H and V sync off of an EIA RS170 sync
on green video signal (NTSC?), could I then apply the RGB video lines
and sync signals to a standard LCD or VGA computer monitor?

The RGB video signals are 0.7V analogue, 16kHz Horiz, 720 x 540
dots/lines resolution.

The other problem is finding a source of 12 to 13" Monitors, Google has
turned up a few overseas but none in Aus.


Also looking at 15" and 17" monitor specs I notice they have a minimum
30kHz horizontal scan, where as my signal is 15kHz. Any ideas?
 
M

Mr.T

Jan 1, 1970
0
Caliban said:
Also looking at 15" and 17" monitor specs I notice they have a minimum
30kHz horizontal scan, where as my signal is 15kHz. Any ideas?

I don't think you'll find any multisync monitors made in the last ten years
that go down to 15kHz, except those already designed for TV use.

MrT.
 
F

Fred Ferd

Jan 1, 1970
0
Caliban said:
If I use an LM1881 IC to strip the H and V sync off of an EIA RS170 sync
on green video signal (NTSC?), could I then apply the RGB video lines and
sync signals to a standard LCD or VGA computer monitor?

The RGB video signals are 0.7V analogue, 16kHz Horiz, 720 x 540 dots/lines
resolution.


TOO SLOW for a standard VGA CRT !
The CRT's expect at least 50Hz vertical and 30kHz horizontal.

So you are hitting it with 16kHz and 30Hz..



Perhaps an LCD can do it - they often have tuner attachements optional.


The other problem is finding a source of 12 to 13" Monitors, Google has
turned up a few overseas but none in Aus.
yeah its hard to find a small CRT.

easy to find small TV's, what are you doing ?? why not convert current
signal to Composite ??
 
C

Caliban

Jan 1, 1970
0
Thanks for the replies, I did a bit of Googling and the info on trying
to get old video arcade games to connect to TVs and monitors is pretty
much what you have covered.

It's a replacement for a few very old process control monitors on a
ship. The sensors and processing are ok but the monitors are
unserviceable. Apparently replacements were not available.

But I have found a company in the UK that make exactly what I'm after (
http://www.kme.co.uk/ ) - it just comes down to the price now

If they are too expensive I'll try RGB -> composite conversion using
something like the Motorola MC1377 and send it to an LCD or CRT TV
monitor and see what the quality is like.
 
C

Caliban

Jan 1, 1970
0
Fred Ferd wrote:
....
easy to find small TV's, what are you doing ?? why not convert current
signal to Composite ??

Yeah it looks like that's what I'll have to do.
See my post above.
 
F

Fred Ferd

Jan 1, 1970
0
Caliban said:
Thanks for the replies, I did a bit of Googling and the info on trying to
get old video arcade games to connect to TVs and monitors is pretty much
what you have covered.

It's a replacement for a few very old process control monitors on a ship.
The sensors and processing are ok but the monitors are unserviceable.
Apparently replacements were not available.

But I have found a company in the UK that make exactly what I'm after (
http://www.kme.co.uk/ ) - it just comes down to the price now

If they are too expensive I'll try RGB -> composite conversion using
something like the Motorola MC1377 and send it to an LCD or CRT TV monitor
and see what the quality is like.


yeah, well for a small computer accurate display you can always try
australian electronics catalogues like "farnell" for "price".

they'll have small CRT's of some sort.

TV's look a bit unprofesional, with their tuning buttons and speakers..
 
T

Terry Given

Jan 1, 1970
0
Fred said:
yeah, well for a small computer accurate display you can always try
australian electronics catalogues like "farnell" for "price".

they'll have small CRT's of some sort.

TV's look a bit unprofesional, with their tuning buttons and speakers..

buy a modern TV, with no buttons other than on/off. Just dont lose the
remote control :)

Cheers
Terry
 
A

Alex Gibson

Jan 1, 1970
0
Caliban said:
If I use an LM1881 IC to strip the H and V sync off of an EIA RS170 sync
on green video signal (NTSC?), could I then apply the RGB video lines and
sync signals to a standard LCD or VGA computer monitor?

The RGB video signals are 0.7V analogue, 16kHz Horiz, 720 x 540 dots/lines
resolution.

The other problem is finding a source of 12 to 13" Monitors, Google has
turned up a few overseas but none in Aus.

What about getting a US NTSC lcd display ?
Lots of industrial types.

Earthlcd.com carries lot but will rip you big time on shipping
(plus java based website)
They have 11.3 and 12.1 inch lcds
http://store.earthlcd.com/s.nl/c.318770/sc.7/category.16/.f

Will need to get power supplies as well
May need to get a mositure proof casing

Going to be pricey unless you can buy second hand.

Alex
 
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