Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SY callsign genealogy
Currently held by GRAHAM, DONALD W
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 K4SY's current licensee, walking backwards.
- KAYWORTH, STEPHEN AFLgranted 2018-09-05cancelled 2020-05-29
Successor callsigns
Callsigns held now by people who previously held K4SY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SY, oldest first.
- GRAHAM, DONALD W FL1996-04-19 → cancelled 2008-04-22
- Smithler, George T FL2008-05-09 → cancelled 2020-05-12
- KAYWORTH, STEPHEN A FL2020-05-29 active