Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0SPA callsign genealogy
Currently held by ACKERMANN, FREDERICK C
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 W0SPA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W0SPA.
- ACKERMANN, FREDERICK CCOgranted 2020-06-20
All historical holders
Every license row we've seen with the callsign W0SPA, oldest first.
- KOLSTAD, ORVILLE A MN1996-05-22 → cancelled 2008-05-23
- ACKERMANN, FREDERICK C CO2017-05-31 → cancelled 2020-06-20