Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WX4U callsign genealogy
Currently held by FERGUSON SR, ROBERT L
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 WX4U's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WX4U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WX4U, oldest first.
- FERGUSON SR, ROBERT L FL1993-11-02 → cancelled 2005-11-03
- Rosenblum, David A FL2025-12-11 active