Confidence: Medium · Source: FCC ULS · As of 2026-09-15
W1SDM callsign genealogy
Currently held by Green, Thomas J
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 W1SDM's current licensee, walking backwards.
- Green, Thomas JMNgranted 2005-06-09cancelled 2005-08-02
Successor callsigns
Callsigns held now by people who previously held W1SDM.
No current licensee on record previously held this callsign.