Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JXO callsign genealogy
Currently held by Grupp, Eardan L
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 K4JXO's current licensee, walking backwards.
- Grupp, Eardan LGAgranted 2009-03-02cancelled 2012-03-20
Successor callsigns
Callsigns held now by people who previously held K4JXO.
- Grupp, Eardan LFLgranted 2017-07-15