Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN9S callsign genealogy
Currently held by AMBROSE, DONN M
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 KN9S's current licensee, walking backwards.
- Schrishuhn, Kenneth LILgranted 1999-03-31cancelled 2003-01-25
Successor callsigns
Callsigns held now by people who previously held KN9S.
- AMBROSE, DONN MWIgranted 2019-05-24
All historical holders
Every license row we've seen with the callsign KN9S, oldest first.
- Schrishuhn, Kenneth L IL2023-01-04 active
- AMBROSE, DONN M— → cancelled 1999-08-04