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Do BNC connectors make any difference to display?

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Wam

Member
Joined
Jan 24, 2001
Thinking of getting a new 22" monitor but was wondering whether to get a BNC cable, as they are not cheap. Will this make the image noticeably better? I will be running at 1600x1200 75hz as I do on my present 21" monitor.
 

Krieger

Member
Joined
Jan 31, 2002
Location
North of Boston, MA
from most of the info I've read, the BNC connectors tend to be better quality... as a fatter of fact I'm typing this up on a 17" monitor with BNC. I'm looking to get a 19 inch for home that has BNC connectors as a can't afford a decent flat panel yet...
 
OP
Wam

Wam

Member
Joined
Jan 24, 2001
Thanks Krieger, have you had a chance to compare the two to see exactly how much difference there is?

BNC cables are fairly expensive in the UK (£30~$50) so I don't want to waste my money for very little difference.
 

Krieger

Member
Joined
Jan 31, 2002
Location
North of Boston, MA
I dont claim to be a visual expert, so unfortuantly I can't tell you with 100% certainty that they are better. I can say that the one I use at work has nice crisp graphics(It's a trinitron) and you can manually change the H and V syncs. I just think they offer a more crisp display than a stanard VGA out. A little searching on the net may help you more.
 

frostmeister

Member
Joined
Jul 6, 2002
Location
Good old UK
I've had a bit of experience with extending VGA cables, and in my opinion, if you have your dislpay set at anything over 1280 x 1024 - or including if you're extending the cable 5 metres or more, there is a noticeable degradation. It'll probably look like "ghosting" - a faint version of the image on display, shifted by a few pixels. Or your dislay will be smudgy, loosing definition on things like detailed pictures where colour changes are close to each other.
On to the crisp display comment from Krieger, I'm using a 21" sony multiscan E500, trinitron flat screen. It is a nice crisp display, and any trinitron tube is going to be better than a normal tube of the same dimensions because of the way the tube's built. If you look closely at a non trinitron tube, you can see the phosphor dots that the screen is made up of. They're round in shape, and have a shadow mask / aperture grille that lets the electrons through in round "bunches". Now, if you look at a trinitron tube, the phosphor dots are rectangular in shape, and because they're squarer, they fit together better than round dots. Because they fit together better, there's less shadow mask and more phosphor dot area for the elctrons to hit, resulting in a better contrast, and sharper pixels with more defined edges, as pxels are square anyway after the video card sends them. However, you don't get a free lunch for nothing, and if you look about 1/3 and 2/3 the way down your trinitron screens, you'll see two very faint lines, where there are wires to hold the shadow mask in place, because the more precise shadow mask is weaker and needs support.
You'd probably need a 19" monitor to notice the difference, but I'd go with BNC connectors if you wanted a decent crisp display, whether you had a trinitron or not. It might depend more on the quality of the monitor though.
 
OP
Wam

Wam

Member
Joined
Jan 24, 2001
Thanks for the info frostmeister, my friend who's a computer programmer and teaches computing asked me about the two lines on his monitor to see if he could get rid of them. He gets really annoyed by them and was even more so when I informed that they were there to stay.

At the moment I have an LG 221 u which is a shadow mask. It's developed a fault and apparently LG are going to replace it with the newer and better 22" .24 dot pit aperture grill. The quality will be a lot better than my present one even using the standard vga but I've not had experience of BNC connected monitors and £30 is a bit too much for me to spend on an experiment.
 

Breadfan

Inactive Moderator
Joined
Jan 4, 2001
Location
Northern VA
As mentioned, the higher you run your resolution, the better the BNC's will work compared to the standard cable. The reason is abillity to carry stronger signal. This makes an impact for sure...it'll make for a sharper, clearer, brighter image.

I remember I found a junked 19" monitor with a dying flyback transformer. I used a cheap belking VGA cable to test it, and the picture quality was somwhat dark and poor. I then used a thicker, more robust VGA cable I had and the difference was great! Going to GNC would have been a further improvment.

You can get away with getting the standard cable, especially if you plan on upgrading the cable at a later time. I'm actually surprised your not getting one for free...my Trinitron came with one, and it was used! Might look around and see if any stores will bundle one with it, especially if this is a new monitor.

A good analogy though, would be buying a Ferrari and using 87octane fuel on it. The ferrari is designed to run on 93 or higher, but *can* run on 87. (Ok, lets not start a debate and just assume it has a good knock sensor!) however, running with 87 octane, it's slower than a stock Mustang GT...(again, assumptions only)

The point is, you don't buy a Ferarri and use cheap fuel that degrades its performance. Same goes with a sweet 22" monitor...use a good cable and the monitor will live up to its price.

Mike
 
OP
Wam

Wam

Member
Joined
Jan 24, 2001
Well, it looks like I'll be shelling out for some BNC cables! After all when I do get my Ferrari I won't be putting 87octane fuel in there!

Thanks for info Krieger, frostmeister & Breadfan.

regards