Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6CSO callsign genealogy
Currently held by WALLISCHECK, JAMES E
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 K6CSO's current licensee, walking backwards.
- CSONGRADI, JOHN JCAgranted 2012-03-08cancelled 2012-04-27
Successor callsigns
Callsigns held now by people who previously held K6CSO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6CSO, oldest first.
- WALLISCHECK, JAMES E CA1995-03-28 → cancelled 2007-03-29
- CSONGRADI, JOHN J CA2022-02-16 active