For example, your call sign WXYZ123, your family members would Identify with your call-sign and maybe add WXYZ123-A -1. Depending on how you and your family members want to set up communication procedures. Edited February 6 by Adamdaj Needed Correction WRUU653, SteveShannon and WRYZ...
this is no different than changing channels after each transmission, an example of which I gave above. It's different because it happens under automatic control and is an intrinsic feature of the transmitter's frequency and modulation circuits, and not subject to operator control on a per freque...
A point-to-point RF link between two repeaters would be an example of fixed stations. Expand Interesting... Wondering what would constitute a 'fixed station' beyond, for example, two base stations in addition to talking to mobiles and portables, but were also used to talk between themselves...