Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9JAK callsign genealogy
Currently held by Kopecky, Jon A
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 KC9JAK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KC9JAK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9JAK, oldest first.
- KARL, JOHN A IL2003-09-23 → cancelled 2015-09-24
- Kopecky, Jon A WI2018-12-21 active