Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4SJF callsign genealogy
Currently held by Busbin, William R
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 N4SJF's current licensee, walking backwards.
- Furst, Stevan JFLgranted 2024-02-27cancelled 2025-03-11
Successor callsigns
Callsigns held now by people who previously held N4SJF.
- Busbin, William RFLgranted 2021-05-05
All historical holders
Every license row we've seen with the callsign N4SJF, oldest first.
- Busbin, William R FL1999-07-13 → cancelled 2001-07-28
- Furst, Stevan J FL2025-03-11 active