Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WH7WS callsign genealogy
Currently held by Schwartau, William K
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 WH7WS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WH7WS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WH7WS, oldest first.
- Hamamoto, Tyron Y HI2009-10-15 → cancelled 2021-10-16
- Schwartau, William K HI2022-01-25 active