Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4JDR callsign genealogy
Currently held by RAY JR, JOHN D
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 KF4JDR's current licensee, walking backwards.
- RAY JR, JOHN DNCgranted 2018-04-06cancelled 2020-03-24
Successor callsigns
Callsigns held now by people who previously held KF4JDR.
- Douglas, Robert AGAgranted 2016-03-14
All historical holders
Every license row we've seen with the callsign KF4JDR, oldest first.
- DOUGLAS, ROBERT A FL1998-10-19 → cancelled 2000-11-17
- RAY JR, JOHN D NC2020-03-24 active