Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4CKF callsign genealogy
Currently held by Yingst, Debra D
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 W4CKF's current licensee, walking backwards.
- OWAIS, WISAM NKYgranted 2018-06-21cancelled 2018-10-10
Successor callsigns
Callsigns held now by people who previously held W4CKF.
- Yingst, Debra DILgranted 2020-07-13
All historical holders
Every license row we've seen with the callsign W4CKF, oldest first.
- Yingst, Debra D IL2007-02-09 → cancelled 2010-09-21
- OWAIS, WISAM N KY2018-10-10 active