Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9JRK callsign genealogy
Currently held by KOLMER, JOSEPH 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 K9JRK's current licensee, walking backwards.
- KOLMER, JOSEPH ROHgranted 2016-05-13cancelled 2019-09-17
Successor callsigns
Callsigns held now by people who previously held K9JRK.
- KOLMER, JOSEPH RPAgranted 2021-11-19
All historical holders
Every license row we've seen with the callsign K9JRK, oldest first.
- AMOS SR, RALPH E IN1988-03-15 → cancelled 2000-03-16
- KOLMER, JOSEPH R PA2019-09-17 → cancelled 2021-11-19