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VGA Active/Powered Splitters (degradation?) (component to vga split too)..

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Discuss VGA Active/Powered Splitters (degradation?) (component to vga split too).. in the Monitors / Videocards forum.



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  #11  
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markm75
 
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Default Re: VGA Active/Powered Splitters (degradation?) (component to vga split too).. - 01-08-2007 , 03:39 PM







Bob Myers wrote:
Quote:
"markm75" <markm75c (AT) msn (DOT) com> wrote in message
news:1168225855.790543.30160 (AT) 38g2000cwa (DOT) googlegroups.com...
I did run across this from one site:
http://www.bluejeanscable.com/articl...videocable.htm
"Over reasonable run lengths (say, under 100 feet), these losses are
not really significant so long as one is dealing with a cable having a
reasonably-sized center conductor (say, 22 AWG or larger)"

That's one of those things which may be true in the majority
of cases, although center-conductor size isn't the only thing
which determines cable losses at high frequencies. Loss
also isn't the only concern here - again, proper termination
impedance is the other big issue, since on long runs "ghosting"
can become a serious problem.


I searched around on this.. it seems alot of people would just use the
RG59 due to ease and risk the loss part I guess.. I'm still hoping
I'll be lucky and just get a decent run of component and wont need to
do that (unfortunately my budget is tight.. i was hoping to keep the
cabling under $200).

I also found notes stating that one should make sure its solid copper,
not copper coated.. center being solid or stranded wire.. and not rated
for TV or satellite (uses conductors not all copper).

It's OK advice as far as it goes, although I would have no
issues with trying a stranded center conductor here. Beyond
that, well, you'd really want to look at the actual cable
specifications rather than trying to guess what's best based on
the cable construction.

Sorry on the reiteration part here.. but I guess it could be hit or
miss if I try an active splitter (at least 70MHZ or more) ranging in
price from $15 to say $50...

Again, you can try it - if it doesn't meet you needs, maybe you
could return it. At worst, you'd be out the $15-50 or maybe
you'd find some other use for the thing.

But what if I skip the active splitter and just do the switch.. a
simple selector.. a 2 in 1 (either component or VGA, active based)..
I've read many blogs where folks have done this without any problems
(and some who said to stay away from X brand, etc).

A switch can also work well if (a) you have no real need to
drive multiple displays at the same time, and (b) the switch is
again a good-quality unit. Poor-quality switchgear will be a
source of impedance problems, and therefore ghosting.

ps.. how did you find my post.. I'm curious..

I regularly read the comp.sys.ibm.pc.hardware.video newsgroup,
which is where this discussion is showing up.

Bob M.
I cant recall if I had this in my previous posts.. I dont think I got
specific though:

Have you ever used or know of anyone who has tried a device like this:

http://www.datapro.net/products/CSV-955A.html

I've just received it.. I am going to test it tonight...

This was my other solution, should I not end up doing VGA with my 360
once I get my projector . This lets me take the component signal and
output it to a PC vga type signal on the PC LCD..

This is where, before, I said that I'd convert the pins to vga, then
use a switch/splitter to split that style connector.. then on the other
side of the splitter or switch.. this device would be used for one
output of the switch.. sending a PC VGA signal (using this transcoder),
while the other port would get converted back to component from the vga
pins.

I've read that you definitely need an active transcoder to get good
quality.. this was the only one that met the bill so to speak.. but
seeing will be believing. So tonight I'll try it, without a splitter,
then I'll try the "Radio shack special" splitter or switch and see how
the image compares when in use (of course later on I'll be dealing with
the cable length issues, once I finally get that projector



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  #12  
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Bob Myers
 
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Default Re: VGA Active/Powered Splitters (degradation?) (component to vga split too).. - 01-08-2007 , 05:27 PM







"markm75" <markm75c (AT) msn (DOT) com> wrote

Quote:
Have you ever used or know of anyone who has tried a device like this:

http://www.datapro.net/products/CSV-955A.html

I've just received it.. I am going to test it tonight...
I'm not familiar with that specific device, no. From the looks of
the thing, what it is probably doing is simply stripping the syncs
off the green video, and putting them out as separate TTL sync
on the VGA connector (fewer and fewer VGA inputs are happy
with sync-on-green video). It's not really doing anything by way
of a "transcoding" as I would use the term beyond that, and I don't
even know if it's buffering (i.e., has a unity-gain amplifier inside)
the signal before shipping it out to the VGA. All I can really
say is - let us know how it turns out.

Bob M.




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  #13  
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markm75
 
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Default Re: VGA Active/Powered Splitters (degradation?) (component to vga split too).. - 01-12-2007 , 09:46 AM




Bob Myers wrote:
Quote:
"markm75" <markm75c (AT) msn (DOT) com> wrote in message
news:1168288758.621114.160840 (AT) 38g2000cwa (DOT) googlegroups.com...

Have you ever used or know of anyone who has tried a device like this:

http://www.datapro.net/products/CSV-955A.html

I've just received it.. I am going to test it tonight...

I'm not familiar with that specific device, no. From the looks of
the thing, what it is probably doing is simply stripping the syncs
off the green video, and putting them out as separate TTL sync
on the VGA connector (fewer and fewer VGA inputs are happy
with sync-on-green video). It's not really doing anything by way
of a "transcoding" as I would use the term beyond that, and I don't
even know if it's buffering (i.e., has a unity-gain amplifier inside)
the signal before shipping it out to the VGA. All I can really
say is - let us know how it turns out.

Bob M.
Well this device has worked out fairly well.. its not as good as the
vga cable for the 360.. at least in terms of filling the screen.. on
the left side of my LCD you can see about a 1/2 or less black vertical
bar (far left).. nothing I've tried has gotten rid of it... I suppose
it has something to do with taking a 720p widescreen image and
attempting to fit it to a 4:3 screen. The images look great though.

I then found a splitter that seems to work.. I really just wanted an
autosensing or manual vga switch, but I cant seem to find any.. at
least none that are under $100...

The splitter is working out ok so far, I tried a test.. first doing the
cable without splits then hooking it up.. though a lag of about 3
minutes b4 i could get back in there to see the difference, I really
couldnt see one to my surpise. No change in brightness etc.. Although
at one point I had hooked up the 2nd connection to the splitter and
tried it.. the brightness levels dropped.. so I tried switching the
ports (its a 4 porter).. to one closer to the other port and then the
levels were back to "normal".

Ill have to have someone try both ways in the other room while watching
the screen to verify that there is no change in quality but it looks
good so far. Its a Aten 250MHZ switch.. I believe that is plenty of
bandwidth too.. even for 1080p if I ever can utilize it (2 ports used).

Mark



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