Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1SBJ callsign genealogy
Currently held by JEFFRIES, STEPHEN B
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 W1SBJ's current licensee, walking backwards.
- JEFFRIES, STEPHEN BMAgranted 2007-09-06cancelled 2011-10-22
Successor callsigns
Callsigns held now by people who previously held W1SBJ.
No current licensee on record previously held this callsign.