Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AA9KJ callsign genealogy
Currently held by Baumgarte, Joseph W
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 AA9KJ's current licensee, walking backwards.
- Baumgarte, Joseph WINgranted 2016-07-19cancelled 2016-09-30
Successor callsigns
Callsigns held now by people who previously held AA9KJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA9KJ, oldest first.
- SPERBER, FRANK AZ2004-03-11 → cancelled 2016-03-30
- Baumgarte, Joseph W IN2026-07-07 active