Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA9CT callsign genealogy
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 AA9CT's current licensee, walking backwards.
- TROWBRIDGE, CHRISTOPHER CILgranted 2008-02-13cancelled 2015-11-07
Successor callsigns
Callsigns held now by people who previously held AA9CT.
- NAVARRETE, GUSTAVOILgranted 2018-02-16
All historical holders
Every license row we've seen with the callsign AA9CT, oldest first.
- TROWBRIDGE, CHRISTOPHER C IL2025-08-13 active
- —— → cancelled 1998-04-28