Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3OSO callsign genealogy
Currently held by Grachev, Aleksey
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 K3OSO's current licensee, walking backwards.
- Grachev, Aleksey GCOgranted 2009-04-13cancelled 2009-05-05
Successor callsigns
Callsigns held now by people who previously held K3OSO.
- Grachev, AlekseyCOgranted 2021-01-06