Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9OKC callsign genealogy
Currently held by Robertson, Tammy 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 K9OKC's current licensee, walking backwards.
- Robertson, Tammy LOKgranted 2017-01-13cancelled 2017-02-07
Successor callsigns
Callsigns held now by people who previously held K9OKC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9OKC, oldest first.
- BEEMAN, ROBERT N IL1988-06-21 → cancelled 2000-06-22
- Robertson, Tammy L OK2017-02-07 active