Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9YFT callsign genealogy
Currently held by Troestler, Eric J
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 KB9YFT's current licensee, walking backwards.
- Troestler, Eric JWIgranted 2025-12-11cancelled 2026-01-06
Successor callsigns
Callsigns held now by people who previously held KB9YFT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9YFT, oldest first.
- Troestler, Donald J WI2000-10-17 → cancelled 2012-10-18
- Troestler, Eric J WI2026-01-06 active