Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4USF callsign genealogy
Currently held by OLSON, MARVIN S
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 WB4USF's current licensee, walking backwards.
- KO4ZRQcancelledAmateur Radio Club At USFFLgranted 2022-04-14cancelled 2022-05-06
Successor callsigns
Callsigns held now by people who previously held WB4USF.
- W4USFactiveAmateur Radio Club at USFFLgranted 2024-05-21
All historical holders
Every license row we've seen with the callsign WB4USF, oldest first.
- OLSON, MARVIN S FL1996-03-20 → cancelled 2008-03-21
- Amateur Radio Club at USF FL2022-05-06 → cancelled 2024-05-21