Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KV9Z callsign genealogy
Currently held by TROJANOWSKI, MICHAEL
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 KV9Z's current licensee, walking backwards.
- Richardson, SamuelCAgranted 2026-05-15cancelled 2026-06-16
Successor callsigns
Callsigns held now by people who previously held KV9Z.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KV9Z, oldest first.
- TROJANOWSKI, MICHAEL IL2014-01-24 → cancelled 2026-04-21
- Richardson, Samuel CA2026-06-16 active