[vdr] Re: OT: RGB Component from J2

["Reinhard Walter Buchner" <rw.buchner@freenet.de>]

Hi Tomas,

> > CRT with a line doubler or tripler. I can still see scan lines on 
> > my 8" Marquee Ultra from a quadrupled source ;o))

> I don't think that the screen actually is 130". 

My screen size (will be as I haven't decided on the final
screen material) is 124" diagonal ;o). Once you have seen
the picture of that size, you'll really hate wathing your 29"
TV :o))).

>My idea was just to get  something better then composite

Yes, of course! Composite is the worst signal you can
get ;o)) A lot of people propagate S-Video (Y/C). While
it is better, it still has it's limitations. One of the problems
is that Y & C are seperated. What's the problem? Well
you have to make sure that the Y & C lines are the same
length. If they are of different lengths you will be inserting
a different delay in Y & C, which may quite well result in
a picture which is worse than composite.

> The beamer supports RGB as well, should I try to take that path?

Yes, it's the only way it will work w/o a matrix conversion
and it's the best way to go anyway ;o). What you need to
check is what kind of RGB input you have. There are
several types:

RGBHV -- This has 5 distinct lines for Red Green Blue
                    and the Horizontal & Vertical syncs. This is
                    the best way to feed the video, but you'll need
                    to build a sync splitter in order to use it with
                    the DVB card..
             
RGsB --    This is the same as above except that you only
                   have three lines and the sync is modulated on
                   top of the green video. W/o additional circuitry
                   your out of luck with the DVB (and it's the worst
                   kind of RGB input, too ;o))

RGBs  --   Here you have 4 lines total R G & B and one
                  sync line which contains horizontal & vertical
                  sync on one line.

If you can hook up the last possibilty, you are all set as
this is exactly what the DVB outputs.

If your CRT has the possibilty to terminated the lines with
75 ohm, please set these to on (many pj's have them always
connected, which is okay, too)

Lastly, any way you go, DON'T use the skimpy cinch cables!
These are NOT 75 ohm cables (your looking for RG-59 or
even RG-6 for a long run. BTW what's your cable length
going to be? If possible use BNC connectors to hook up
the equipment.


Greets,
Reinhard


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