Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB0SY callsign genealogy
Currently held by Hamilton, John A
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 AB0SY's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held AB0SY.
- Hamilton, John ASDgranted 2007-12-27cancelled 2012-04-13