Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD9UMP callsign genealogy
Currently held by Schroeder, James D
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 WD9UMP's current licensee, walking backwards.
- Schroeder, James DWAgranted 2010-09-27cancelled 2011-02-25
Successor callsigns
Callsigns held now by people who previously held WD9UMP.
No current licensee on record previously held this callsign.