Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9BTQ callsign genealogy
Currently held by KRAUTHOFF, MILTON 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 W9BTQ's current licensee, walking backwards.
- KRACHT, KAROLINE AILgranted 2018-11-09cancelled 2018-12-28
Successor callsigns
Callsigns held now by people who previously held W9BTQ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9BTQ, oldest first.
- KRAUTHOFF, MILTON J WI1994-05-24 → cancelled 2006-05-25
- MUELLER, KAROLINE IL2018-12-28 active