Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4RCJ callsign genealogy
Currently held by Johnson, Ronald 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 KM4RCJ's current licensee, walking backwards.
- Johnson, Ronald CALgranted 2014-09-12cancelled 2014-10-07
Successor callsigns
Callsigns held now by people who previously held KM4RCJ.
No current licensee on record previously held this callsign.