Transmission line track width calculation

[mohana_s14]

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.

 

[michwill]

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

 

[marce]

https://www.saturnpcb.com/pcb_toolkit.htm

Look up the RS 485 spec

 

[Ow@i$]

saturn pcb tool kit is appropriate for this