Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD9O callsign genealogy
Currently held by ENGSTROM Sr, DAVE P
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 WD9O's current licensee, walking backwards.
- ENGSTROM, DAVE PWAgranted 2023-06-24cancelled 2024-05-07
- KB7SPBno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held WD9O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD9O, oldest first.
- CONTRERAS, JUAN A TX2012-01-03 → cancelled 2024-03-12
- ENGSTROM Sr, DAVE P WA2024-05-07 active