SmartController & SeaTalkng

I'm upgrading all my equipment and the only SeaTalk device left will be the SmartController Base Station. Everything else will be STng or NMEA2000. I will be using a SeaTalk-to-SeaTalkng convertor to connect the base station.

1. What is the LEN for the base station I should account for as I design a balanced SeaTalkng backbone?

2. The ferrite for the charging cable is missing. Where can I get a replacement for the correct one to use?

Thanks!