Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4YMA callsign genealogy
Currently held by Erwin, Jonathan S
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 KF4YMA's current licensee, walking backwards.
- Erwin, Jonathan SPAgranted 2020-08-20cancelled 2020-11-24
Successor callsigns
Callsigns held now by people who previously held KF4YMA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4YMA, oldest first.
- ERWIN, JONATHAN S NC1998-05-14 → cancelled 2010-05-15
- Erwin, Jonathan S PA2020-11-24 active