Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9JOS callsign genealogy
Currently held by Oborny Jr, Joseph L
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 K9JOS's current licensee, walking backwards.
- Oborny Jr, Joseph LCAgranted 2021-10-04cancelled 2021-10-22
Successor callsigns
Callsigns held now by people who previously held K9JOS.
- Caballero, Jose AWIgranted 2020-04-14
All historical holders
Every license row we've seen with the callsign K9JOS, oldest first.
- Caballero., Jose A WI2009-06-26 → cancelled 2010-06-29
- Oborny Jr, Joseph L CA2021-10-22 active