Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3DU callsign genealogy
Currently held by KELLER, JOSEPH R
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 AC3DU's current licensee, walking backwards.
- KELLER, JOSEPH RPAgranted 2018-11-20cancelled 2018-12-18
Successor callsigns
Callsigns held now by people who previously held AC3DU.
No current licensee on record previously held this callsign.