Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3SDF callsign genealogy
Currently held by FISCHER, STEPHEN 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 K3SDF's current licensee, walking backwards.
- FISCHER, STEPHEN DMDgranted 2021-01-29cancelled 2022-04-15
Successor callsigns
Callsigns held now by people who previously held K3SDF.
No current licensee on record previously held this callsign.