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Re: Yet another nifty project idea: RGB using Cat-5e

PZ wrote:

I built a RGB monitor cable out of ribbon cable and used it for about 4
years back in the mid 90's.  I never had a visible impedance problem
although the cable was relatively short (about 14 inches).  15 pin IDC
ribbon cable connectors are $1.55/ea in the Jameco cataloge.  No tricky
wiring either.

Note: I only used it with my AE ColorLink expansion on my Ramworks III
hooked up to a GS monitor.  It should perform similarly on a GS.


Impedance matching of video cables is an issue only from the point
of view of reducing signal reflections.

Since the highest dot rate is about 14MHz, corresponding to a period of
70ns, and 70ns delay would be about 35 feet of cable, it is unlikely
that any cable less than 10 feet long would have _any_ impedance
problem with Apple II video.

Of course, RFI (either direction) is another issue, so shielding
(even the imperfect shielding of a twisted pair) is a good thing.

-michael

8-voice music synthesizer using NadaNet networking!
Home page:  http://members.aol.com/MJMahon/