Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9RSJ callsign genealogy
Currently held by SERGIO JR, RONALD
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 K9RSJ's current licensee, walking backwards.
- SERGIO JR, RONALDFLgranted 2005-04-13cancelled 2010-06-22
Successor callsigns
Callsigns held now by people who previously held K9RSJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9RSJ, oldest first.
- SCHUELER, CLARENCE H IL1994-03-15 → cancelled 2006-03-16
- SERGIO JR, RONALD FL2020-06-04 active