Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9TTE callsign genealogy
Currently held by Derr, Thomas
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 K9TTE's current licensee, walking backwards.
- derr, thomasWIgranted 2021-03-19cancelled 2025-03-21
Successor callsigns
Callsigns held now by people who previously held K9TTE.
- Knodle, Walter SORgranted 2006-04-18cancelled 2008-01-26
All historical holders
Every license row we've seen with the callsign K9TTE, oldest first.
- Knodle III, Walter S OR1996-11-01 → cancelled 2006-04-18
- Derr, Thomas WI2025-03-21 active