Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9TSM callsign genealogy
Currently held by MC DONALD, SAMUEL 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 W9TSM's current licensee, walking backwards.
- MC DONALD, SAMUEL LILgranted 2014-03-31cancelled 2016-09-02
Successor callsigns
Callsigns held now by people who previously held W9TSM.
No current licensee on record previously held this callsign.