Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0JOS callsign genealogy
Currently held by Sandfort, Jeffrey O
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 K0JOS's current licensee, walking backwards.
- Sandfort, Jeffrey OIDgranted 2007-03-19cancelled 2009-06-02
Successor callsigns
Callsigns held now by people who previously held K0JOS.
No current licensee on record previously held this callsign.