Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4BF callsign genealogy
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 AD4BF's current licensee, walking backwards.
- FILER, ROBERT WTNgranted 2012-12-19cancelled 2014-01-07
Successor callsigns
Callsigns held now by people who previously held AD4BF.
- ATKINSON, JAMES TOHgranted 1998-07-06cancelled 2006-01-19
All historical holders
Every license row we've seen with the callsign AD4BF, oldest first.
- FILER, ROBERT W TN2023-10-21 active
- —— → cancelled 1998-07-06