Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC7UM callsign genealogy
Currently held by KOHLER, TIMOTHY J
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 AC7UM's current licensee, walking backwards.
- KOHLER, TIMOTHY JWAgranted 2010-06-25cancelled 2011-07-06
Successor callsigns
Callsigns held now by people who previously held AC7UM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC7UM, oldest first.
- KOHLER, JAMES A WA2002-09-25 → cancelled 2009-12-19
- KOHLER, TIMOTHY J WA2021-08-17 active