Transmission line track width calculation

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mohana_s14

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Hi,
how to calculate the trace width for 80 meter distance transmission line. I am using rs 485 ic, and we split the pcb and join it using board to board connector. Single pcb length is 560mm, total length is 80 meter. Shall i route differential pair routing for AB line.
 

Just found **broken link removed**, may be that helps...
 

saturn pcb tool kit is appropriate for this
 

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