Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA9SDC callsign genealogy
Currently held by Alt, Douglas
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 WA9SDC's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WA9SDC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA9SDC, oldest first.
- Alt, Douglas NC2018-05-15 → cancelled 2024-11-16
- Flaherty, Adair MN2025-04-22 active