Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0DBT callsign genealogy
Currently held by Hjelm, John 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 W0DBT's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W0DBT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0DBT, oldest first.
- Hjelm, John R MN2008-08-27 → cancelled 2020-10-24
- Calleja, Menandro O FL2024-05-24 active