Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4BDU callsign genealogy
Currently held by DAVIS, FREDERICK W
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 N4BDU's current licensee, walking backwards.
- SCHEFFLER, DONNIE GKYgranted 2004-08-13cancelled 2004-09-14
Successor callsigns
Callsigns held now by people who previously held N4BDU.
- DAVIS, FREDERICK WMDgranted 2002-07-26cancelled 2002-09-17
All historical holders
Every license row we've seen with the callsign N4BDU, oldest first.
- WOERNER, RAYMOND P GA1988-03-29 → cancelled 2000-03-30
- DAVIS, FREDERICK W MD2002-06-28 → cancelled 2002-07-26
- SCHEFFLER, DONNIE G KY2004-09-14 → cancelled 2016-09-15