Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KW4JM callsign genealogy
Currently held by Marcal, Joao
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 KW4JM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KW4JM.
- CARTER, SCOTTNCgranted 2022-09-17
All historical holders
Every license row we've seen with the callsign KW4JM, oldest first.
- CARTER, SCOTT NC2014-03-17 → cancelled 2022-09-17
- Marcal, Joao FL2025-02-08 active