Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JO callsign genealogy
Currently held by Valentine, Ellicott
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 K4JO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4JO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JO, oldest first.
- Valentine, Ellicott NC1997-01-23 → cancelled 2006-10-18
- HERRICK, WAYNE C NC2018-09-20 active