SD Link System is hot all the time. When you key up one repeater and all key up all the repeater across the state so allow for the linking delay by waiting 2 seconds. To tie in the Black Hills repeaters for a short time use 7* to bring it up and 8* to bring it down. Bring it down when you're done using it.
Linked to other SDARC repeaters across the state along interstates I-29 and I-90. The 10 largest town in South Dakota are covered by the SD Link.