Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4X callsign genealogy
Currently held by SCHIPPER, BERWIN J
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 KF4X's current licensee, walking backwards.
- Drum, Joshua TFLgranted 2023-04-11cancelled 2026-04-03
Successor callsigns
Callsigns held now by people who previously held KF4X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4X, oldest first.
- SCHIPPER, BERWIN J TX2014-02-07 → cancelled 2026-03-17
- Drum, Joshua T FL2026-04-03 active