Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT9O callsign genealogy
Currently held by Thiel, Adam H
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 KT9O's current licensee, walking backwards.
- Thiel, Adam HILgranted 2022-05-18cancelled 2026-06-19
Successor callsigns
Callsigns held now by people who previously held KT9O.
- BOYD, TIMOTHY MILgranted 2016-10-11
All historical holders
Every license row we've seen with the callsign KT9O, oldest first.
- OSBORN, TED H IN2013-10-18 → cancelled 2026-03-06
- Thiel, Adam H IL2026-06-19 active