Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MOR callsign genealogy
Currently held by JACOBSEN, DAVID M
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 K4MOR's current licensee, walking backwards.
- Ortiz, MarcosGAgranted 2026-04-16cancelled 2026-07-17
Successor callsigns
Callsigns held now by people who previously held K4MOR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MOR, oldest first.
- JACOBSEN, DAVID M TN2011-03-08 → cancelled 2023-03-31
- Ortiz, Marcos GA2026-07-17 active