Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9F callsign genealogy
Currently held by FRIEVALT, JOHN K
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 AB9F's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB9F.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB9F, oldest first.
- FRIEVALT, JOHN K WI2007-09-20 → cancelled 2019-12-17
- Hess, Ronald C PA2020-01-24 active