Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9TM callsign genealogy
Currently held by MUDERSBACH, RONALD A
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 AB9TM's current licensee, walking backwards.
- MILLER, TUCKILgranted 2020-01-03
Successor callsigns
Callsigns held now by people who previously held AB9TM.
All historical holders
Every license row we've seen with the callsign AB9TM, oldest first.
- MUDERSBACH, RONALD A WI2008-12-18 → cancelled 2009-06-13
- MILLER, TUCK IL2018-10-16 → cancelled 2020-01-03