Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4GSO callsign genealogy
Currently held by COLLAZO, JOSE 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 N4GSO's current licensee, walking backwards.
- O HEARN, GERALD SFLgranted 1999-07-21cancelled 2009-06-09
Successor callsigns
Callsigns held now by people who previously held N4GSO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4GSO, oldest first.
- COLLAZO, JOSE R FL1997-02-20 → cancelled 2009-02-21
- O HEARN, GERALD S NC2019-06-14 active