Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC0BTM callsign genealogy
Currently held by Thomson, Grace B
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by KC0BTM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KC0BTM.
- Thomson, Grace BWAgranted 2022-09-20