Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6MSJ callsign genealogy
Currently held by Mission San Jose High School Amateur Radio Club
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 W6MSJ's current licensee, walking backwards.
- KO6KHRcancelledMission San Jose High School Amateur Radio ClubCAgranted 2025-07-30cancelled 2025-08-19
Successor callsigns
Callsigns held now by people who previously held W6MSJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6MSJ, oldest first.
- JOHNSON, SANDRA L AR2010-03-03 → cancelled 2020-12-10
- Mission San Jose High School Amateur Radio Club CA2025-08-19 active