Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SDC callsign genealogy
Currently held by Colburn, Samuel D
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 W1SDC's current licensee, walking backwards.
- Colburn, Samuel DMAgranted 2018-07-05cancelled 2018-07-24
Successor callsigns
Callsigns held now by people who previously held W1SDC.
No current licensee on record previously held this callsign.