Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4YM callsign genealogy
Currently held by DONALDSON SR, WINFORD G
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 KF4YM's current licensee, walking backwards.
- DONALDSON SR, WINFORD GTNgranted 1994-10-21cancelled 2002-05-24
Successor callsigns
Callsigns held now by people who previously held KF4YM.
- DONALDSON SR, WINFORD GTNgranted 1994-10-21cancelled 2002-05-24
All historical holders
Every license row we've seen with the callsign KF4YM, oldest first.
- DONALDSON SR, WINFORD G TN1994-10-21 → cancelled 2002-01-08
- DONALDSON SR, WINFORD G TN2021-09-21 active