Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JSX callsign genealogy
Currently held by PERKINS SR, 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 K4JSX's current licensee, walking backwards.
- Sponsler, Ronald LALgranted 2022-03-22cancelled 2022-05-10
Successor callsigns
Callsigns held now by people who previously held K4JSX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JSX, oldest first.
- PERKINS SR, JOSEPH W AL1996-05-22 → cancelled 2008-05-23
- Sponsler, Ronald L AL2022-05-10 active