Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4SJO callsign genealogy
Currently held by Sjoberg, Carl R
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 KM4SJO's current licensee, walking backwards.
- Sjoberg, Carl RFLgranted 2014-05-19cancelled 2014-06-27
Successor callsigns
Callsigns held now by people who previously held KM4SJO.
- Sjoberg, Carl RWAgranted 2024-05-17