Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W6MKL callsign genealogy
Currently held by Heiser Jr., William W
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 W6MKL's current licensee, walking backwards.
- Heiser Jr., William WCAgranted 2023-09-30cancelled 2026-06-13
Successor callsigns
Callsigns held now by people who previously held W6MKL.
- Karjanlahti, MikaMNgranted 2022-02-12cancelled 2022-05-06
All historical holders
Every license row we've seen with the callsign W6MKL, oldest first.
- Stanton, Edward F CA2006-01-11 → cancelled 2018-03-21
- Karjanlahti, Mika MN2021-04-09 → cancelled 2022-02-12
- Heiser Jr., William W CA2026-06-13 active