Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9OSH callsign genealogy
Currently held by Braun, Robert R
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 K9OSH's current licensee, walking backwards.
- Cooper, John MWIgranted 2023-07-01cancelled 2023-07-21
Successor callsigns
Callsigns held now by people who previously held K9OSH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9OSH, oldest first.
- Braun, Robert R WI2005-07-15 → cancelled 2017-09-26
- Cooper, John M WI2023-07-21 active