Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0JBC callsign genealogy
Currently held by JACOBS, HAROLD F
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 K0JBC's current licensee, walking backwards.
- Carlson, Justin BCOgranted 2020-12-15cancelled 2021-01-05
Successor callsigns
Callsigns held now by people who previously held K0JBC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0JBC, oldest first.
- JACOBS, HAROLD F NE1993-11-30 → cancelled 2005-12-01
- Carlson, Justin B CO2021-01-05 active