Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4SJP callsign genealogy
Currently held by HARPER, CHARLES C
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 K4SJP's current licensee, walking backwards.
- Powell, Shaun JALgranted 2024-05-21cancelled 2024-06-08
Successor callsigns
Callsigns held now by people who previously held K4SJP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SJP, oldest first.
- HARPER, CHARLES C FL1992-01-21 → cancelled 2004-01-22
- Powell, Shaun J AL2024-06-08 active