Confidence: Medium · Source: FCC ULS · As of 2026-09-15
K9ABJ callsign genealogy
Currently held by DE SMIDT, JULIO 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 K9ABJ's current licensee, walking backwards.
- REHWALDT, JON SINgranted 2014-12-01cancelled 2014-12-23
Successor callsigns
Callsigns held now by people who previously held K9ABJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9ABJ, oldest first.
- DE SMIDT, JULIO A WI1994-02-01 → cancelled 2006-02-02
- REHWALDT, JON S IN2026-02-28 active