Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB7JK callsign genealogy
Currently held by Knudsen, John W
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 AB7JK's current licensee, walking backwards.
- Knudsen, John WWAgranted 2017-09-19cancelled 2017-12-19
Successor callsigns
Callsigns held now by people who previously held AB7JK.
- MEDLEY, K DavidFLgranted 2014-03-04cancelled 2014-08-07
All historical holders
Every license row we've seen with the callsign AB7JK, oldest first.
- MEDLEY, KIM D FL2004-03-10 → cancelled 2014-03-04
- Knudsen, John W WA2017-12-19 active