Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4SDI callsign genealogy
Currently held by VALLADARES, JULIE A
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 KF4SDI's current licensee, walking backwards.
- ISAACS, SCOTT DKYgranted 2016-04-29cancelled 2022-05-03
Successor callsigns
Callsigns held now by people who previously held KF4SDI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4SDI, oldest first.
- VALLADARES, JULIE A FL2007-05-30 → cancelled 2019-05-31
- ISAACS, SCOTT D KY2022-05-03 active