Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KR4FJM callsign genealogy
Currently held by Johnson, Theodore S
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 KR4FJM's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KR4FJM.
- Johnson, Theodore SFLgranted 2025-08-05