Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9FYW callsign genealogy
Currently held by Mayerl, Jason M
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 K9FYW's current licensee, walking backwards.
- MAYERL, JASON MWIgranted 2014-03-18cancelled 2023-09-29
Successor callsigns
Callsigns held now by people who previously held K9FYW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9FYW, oldest first.
- MAYERL, MICHAEL C WI2017-08-11 → cancelled 2021-09-18
- Mayerl, Jason M WI2023-09-29 active