Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9BYS callsign genealogy
Currently held by SCHUMACHER, CARL E
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 N9BYS's current licensee, walking backwards.
- Schweiger, RyanWIgranted 2015-02-25cancelled 2017-03-17
Successor callsigns
Callsigns held now by people who previously held N9BYS.
- SCHUMACHER, CARL EWIgranted 2021-07-14
All historical holders
Every license row we've seen with the callsign N9BYS, oldest first.
- SCHUMACHER, CARL E WI2004-03-12 → cancelled 2011-09-13
- Schweiger, Ryan WI2017-03-17 active