Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JSY callsign genealogy
Currently held by FOSCUE JR, JAMES E
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 K4JSY's current licensee, walking backwards.
- Yelken, Jeremy SVAgranted 2020-02-12cancelled 2020-04-28
Successor callsigns
Callsigns held now by people who previously held K4JSY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JSY, oldest first.
- FOSCUE JR, JAMES E NC2008-04-08 → cancelled 2020-04-09
- Yelken, Jeremy S GA2020-04-28 active