Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD9U callsign genealogy
Currently held by Jensen, Mark G
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 WD9U's current licensee, walking backwards.
- Jensen, Mark GWIgranted 2002-01-10cancelled 2011-01-07
Successor callsigns
Callsigns held now by people who previously held WD9U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD9U, oldest first.
- MORTON, DONALD H IN1998-06-15 → cancelled 2010-06-16
- Jensen, Mark G WI2021-01-05 active