Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KX4SM callsign genealogy
Currently held by Speed, James E
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 KX4SM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KX4SM.
- Speed, James EFLgranted 2022-11-11