Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W0DTD callsign genealogy
Currently held by Trettin, Robert E
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 W0DTD's current licensee, walking backwards.
- Trettin, Robert EIAgranted 2015-02-26cancelled 2016-12-31
Successor callsigns
Callsigns held now by people who previously held W0DTD.
No current licensee on record previously held this callsign.