Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD6SF callsign genealogy
Currently held by Forman, Stuart 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 AD6SF's current licensee, walking backwards.
- Forman, Stuart MCAgranted 2015-08-20cancelled 2018-09-15
Successor callsigns
Callsigns held now by people who previously held AD6SF.
- Bergquist, John FCAgranted 2020-06-26
All historical holders
Every license row we've seen with the callsign AD6SF, oldest first.
- Bergquist, John F CA2000-08-24 → cancelled 2000-09-23
- Forman, Stuart M CA2018-09-15 active