Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4JAK callsign genealogy
Currently held by AIKEN D-STAR CLUB
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 KJ4JAK's current licensee, walking backwards.
- Karbas, Jonathan AFLgranted 2024-08-06cancelled 2024-08-24
Successor callsigns
Callsigns held now by people who previously held KJ4JAK.
- KR4AIKactiveAIKEN D-STAR CLUBSCgranted 2019-02-01
All historical holders
Every license row we've seen with the callsign KJ4JAK, oldest first.
- AIKEN D-STAR CLUB SC2009-01-22 → cancelled 2009-03-17
- Karbas, Jonathan A FL2024-08-24 active