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A minor correction to make on my previous comments on the SDI cable in use. I actually use a combination of Belden 1694A and 1695A for video signals. Both types are meant for SDI and are rated to 4.5GHz.
The particular one in use currently, which connects DVD player SDI-mod to Crystalio-II is the 1695A.
The differences between the two cables are mainly on the dielectric/jacket materials:
1694A (Dielectric: Gas-injected FHDPE - Foam HighDensity Polyethylene; Outer jacket: PVC; Nominal Attenuation of 3GHz at 100ft is 10.67db)
1695A (Dielectric: FFEP - Foam Fluorinated Ethylene Propylene / Teflon; Outer jacket: Flamarrest; Nominal Attenuation of 3GHz at 100ft is 13.7db)
Although Teflon is a good choice as a dielectric material due to its inertness and low-capacitance, note the slightly higher attenuation on the high-frequency range when comparing to FHDPE.
However, for the particular application in concern, the digital video signal is mainly SDTV (480i/525i), and the cable run length is very short (1m). So I preferred deploying the 1695A instead, as it is slightly stiffer and more resilent than the 1694A, and the cable's inner Teflon core couples better to the non-soldering BNC plugs in use.
For longer runs of video cable, I use the 1694A instead. I use this mainly for analogue video signal, which is progressively becoming a dying breed of application in my setup :P
Either way, both 1694A and 1695A are excellent choices for SDI application.