FreeLists / si-list / [SI-LIST] Equations for creating twisted pair transmission lines?

["tom_cip_11551" <tom_cip_11551@xxxxxxxxxxx>]

Hi,

I have been creating transmission lines on PCBs for longer than most 
people that use this group have been around. However, I now have the 
need to use a twisted pair cable for the transmission of a 270 Mbps 
digital data stream (SMPTE 259M digital video to be specific). I am 
sure that there must be an easy way to account for characteristic 
impedance in terms of cable types and thicknesses and twists per 
inch, etc. I just have not been able to find a good reference (can't 
cut through the advertiesments for cable sales).

Thank You
Tom
tom_cip_11551@xxxxxxxxxxx


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