Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9SJ callsign genealogy
Currently held by Lindgren, John R
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 W9SJ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W9SJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9SJ, oldest first.
- JAMIESON SR, SAMUEL J IN2006-08-22 → cancelled 2015-01-28
- Lindgren, John R WA2017-02-17 active