Confidence: Medium · Source: FCC ULS · As of 2026-09-11
AF4OS callsign genealogy
Currently held by JACOBSON, CARL P
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 AF4OS's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held AF4OS.
- JACOBSON, CARL PTXgranted 2009-06-27cancelled 2018-09-28