chrisv <chrisv (AT) nospam (DOT) invalid> kenjka:
And, why is that? Do you know why BNC is used at all?

--
Pilico prolijece zbijen mackau bacu danima
na maksimirskom stadionu. By runf

Damir Lukic, calypso (AT) fly (DOT) srk.fer.hr
a member of hr.comp.hardver FAQ-team

On 29 Jul 2003 20:51:20 GMT, calypso (AT) fly (DOT) srk.fer.hr wrote:

I believe I understand why it's better in theory, yes. AFAIK, it's
mainly that the individual coaxial cables can be made larger, which,
along with the BNC connectors themselves, makes it easier to control
the impedance through the length of the cables.

I also know that, in practice, BNC cables are often no better, and
sometimes even worse, than regular VGA cable. They are poorly made,
so that their theoretical advantage is not realized. Really, the most
important thing is the cable's quality, not it's configuration.

"chrisv" <chrisv (AT) nospam (DOT) invalid> wrote


While the cable quality is very important, the BNC style of
connection does offer at least one significant advantage over
the "VGA" connector besides permitting larger (and therefore
generally lower-loss) cables. You are FAR more likely to have
the cable properly terminated (attached) to the connector
in the BNC case, and therefore wind up with essentially no
impedance discontinuity at the connector. That's a non-trivial
difference, especially (1) at higher video rates and (2) in terms
of the overall EMI performance of the system.

Bob M.