Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4SXO callsign genealogy
Currently held by Winsor, Robert S
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 KM4SXO's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KM4SXO.
- Winsor, Robert SVAgranted 2026-04-07