Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NW4J callsign genealogy
Currently held by RIGGS, MICHAEL 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 NW4J's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NW4J.
No current licensee on record previously held this callsign.