Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4YSW callsign genealogy
Currently held by BLACKWELL, SAMUEL J
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 W4YSW's current licensee, walking backwards.
- Sivitski, YuriOHgranted 2024-05-10cancelled 2024-08-23
Successor callsigns
Callsigns held now by people who previously held W4YSW.
- BLACKWELL, SAMUEL JTNgranted 2010-10-23cancelled 2022-11-18
All historical holders
Every license row we've seen with the callsign W4YSW, oldest first.
- BLACKWELL, SAMUEL J TN1994-01-18 → cancelled 2000-11-17
- Russell, Clyde H TX2008-04-01 → cancelled 2020-04-02
- Sivitski, Yuri OH2024-08-23 active