Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9JDK callsign genealogy
Currently held by KOROPOULIS, JEFFREY 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 W9JDK's current licensee, walking backwards.
- KOROPOULIS, JEFFREY DINgranted 2018-03-26cancelled 2018-04-13
Successor callsigns
Callsigns held now by people who previously held W9JDK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9JDK, oldest first.
- JURKOSHEK, CHARLES FL1997-06-18 → cancelled 2009-06-19
- KOROPOULIS, JEFFREY D IN2018-04-13 active