Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9LUO callsign genealogy
Currently held by TSCHANNEN, ROBERT F
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 W9LUO's current licensee, walking backwards.
- Gardner, Marilyn FILgranted 2002-06-12cancelled 2004-01-10
Successor callsigns
Callsigns held now by people who previously held W9LUO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9LUO, oldest first.
- TSCHANNEN, ROBERT F CO1995-10-24 → cancelled 2002-01-22
- Gardner, Marilyn F IL2013-11-30 → cancelled 2026-03-07