Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0SM callsign genealogy
Currently held by Johnson Jr, Roy F
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 AC0SM's current licensee, walking backwards.
- Johnson Jr, Roy FMOgranted 2010-04-09cancelled 2010-06-16
Successor callsigns
Callsigns held now by people who previously held AC0SM.
No current licensee on record previously held this callsign.