Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4KSI callsign genealogy
Currently held by LEMKE, JAMES E
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 K4KSI's current licensee, walking backwards.
- LEMKE, JAMES EFLgranted 2001-11-28cancelled 2003-07-18
Successor callsigns
Callsigns held now by people who previously held K4KSI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4KSI, oldest first.
- KISSINGER, CHARLES C KY1990-04-24 → cancelled 2000-01-24
- LEMKE, JAMES E TN2023-09-12 active