Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AG4DG callsign genealogy
Currently held by Hsu, Jason Y
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 AG4DG's current licensee, walking backwards.
- Gjerde, Douglas MWIgranted 2024-04-25cancelled 2025-03-18
Successor callsigns
Callsigns held now by people who previously held AG4DG.
- Hsu, Jason YMNgranted 2024-10-05
All historical holders
Every license row we've seen with the callsign AG4DG, oldest first.
- Hsu, Jason Y IA1997-08-14 → cancelled 2004-10-16
- Gjerde, Douglas M WI2025-03-18 active