Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NO1S callsign genealogy
Currently held by EMERSON, WILLIAM H
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 NO1S's current licensee, walking backwards.
- Liang, QuanshengMAgranted 2019-09-18cancelled 2019-11-13
Successor callsigns
Callsigns held now by people who previously held NO1S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NO1S, oldest first.
- EMERSON, WILLIAM H CT2007-08-03 → cancelled 2019-10-22
- Liang, Quansheng MA2019-11-13 active