Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF3DU callsign genealogy
Currently held by Culver, Ralph S
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 KF3DU's current licensee, walking backwards.
- CULVER, RALPH SDEgranted 1995-10-24cancelled 2000-02-01
- KB3BFAno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KF3DU.
- Culver, Ralph SDEgranted 2014-07-10