Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO1J callsign genealogy
Currently held by OLDS, CHRISTOPHER K
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 KO1J's current licensee, walking backwards.
- Whitehouse, Randall TCTgranted 2022-03-16cancelled 2023-03-13
Successor callsigns
Callsigns held now by people who previously held KO1J.
- OLDS, CHRISTOPHER KSCgranted 2020-11-21
All historical holders
Every license row we've seen with the callsign KO1J, oldest first.
- KIMMERLE SR, ROBERT F NH2005-12-15 → cancelled 2018-03-15
- OLDS, CHRISTOPHER K UT2018-04-03 → cancelled 2020-11-21
- Whitehouse, Randall T CT2023-03-13 active