Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4TSO callsign genealogy
Currently held by BALDWIN, DONALD F
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 K4TSO's current licensee, walking backwards.
- BALDWIN, DONALD FSCgranted 2012-01-23cancelled 2012-02-22
Successor callsigns
Callsigns held now by people who previously held K4TSO.
No current licensee on record previously held this callsign.