Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC7SQ callsign genealogy
Currently held by Defrees, Mark R
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 AC7SQ's current licensee, walking backwards.
- Defrees, Mark RORgranted 1992-07-21cancelled 2002-04-24
Successor callsigns
Callsigns held now by people who previously held AC7SQ.
No current licensee on record previously held this callsign.