Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4HQ callsign genealogy
Currently held by SIGMON, CARL D
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 KO4HQ's current licensee, walking backwards.
- N4PFJno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KO4HQ.
- SIGMON, CARL DNCgranted 2002-06-22cancelled 2003-05-17