Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9SW callsign genealogy
Currently held by CHICAGO SUBURBAN RADIO ASSOCIATION
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 W9SW's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W9SW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9SW, oldest first.
- KRIZ, EDWIN A TX2006-08-26 → cancelled 2014-03-01
- CHICAGO SUBURBAN RADIO ASSOCIATION IL2024-12-05 active