Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4UPO callsign genealogy
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 N4UPO'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 N4UPO.
- OLIVER, THOMAS MPAgranted 1997-01-16cancelled 2003-01-25