Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SJM callsign genealogy
Currently held by KARNATH, NORBERT 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 K4SJM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4SJM.
- MURRAY, STUART JSCgranted 2020-05-19cancelled 2021-03-30
All historical holders
Every license row we've seen with the callsign K4SJM, oldest first.
- KARNATH, NORBERT A FL1994-11-22 → cancelled 2006-11-23
- MURRAY, STUART J SC2018-04-03 → cancelled 2020-05-19