Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N3OSI callsign genealogy
Currently held by CHANG, CHAO CHUNG
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 N3OSI's current licensee, walking backwards.
- RICHARDS, JIMMIE ANVgranted 2014-09-09cancelled 2024-04-19
Successor callsigns
Callsigns held now by people who previously held N3OSI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N3OSI, oldest first.
- CHANG, CHAO CHUNG MD1993-04-06 → cancelled 2005-04-07
- RICHARDS, JIMMIE A NV2024-04-19 active