Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0YDM callsign genealogy
Currently held by SCHMIDT, WAYNE J
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 K0YDM's current licensee, walking backwards.
- Christensen, David MSDgranted 2015-11-18cancelled 2015-12-08
Successor callsigns
Callsigns held now by people who previously held K0YDM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0YDM, oldest first.
- SCHMIDT, WAYNE J SD1998-07-09 → cancelled 2010-07-10
- Christensen, David M SD2025-11-20 active