Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K7OAK callsign genealogy
Currently held by JACOBSON, DONALD 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 K7OAK's current licensee, walking backwards.
- VINOGRAD, PATRICK AORgranted 2014-09-18cancelled 2016-06-28
Successor callsigns
Callsigns held now by people who previously held K7OAK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7OAK, oldest first.
- JACOBSON, DONALD R WA1991-04-30 → cancelled 2003-05-01
- VINOGRAD, PATRICK A OR2016-06-28 active