Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K3SBU callsign genealogy
Currently held by DZIUBKOWSKI, ROBERT L
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 K3SBU's current licensee, walking backwards.
- Dziubkowski, Robert MPAgranted 2017-11-30cancelled 2018-04-21
Successor callsigns
Callsigns held now by people who previously held K3SBU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3SBU, oldest first.
- DZIUBKOWSKI, ROBERT L PA2016-03-15 → cancelled 2016-05-29
- Dziubkowski, Robert M PA2018-04-21 active