Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4GDO callsign genealogy
Currently held by HARPER, SYDNEY S
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 N4GDO's current licensee, walking backwards.
- HARPER, SYDNEY SALgranted 1998-05-29cancelled 2002-11-05
Successor callsigns
Callsigns held now by people who previously held N4GDO.
- RUHL, RICHARD SFLgranted 2010-07-17cancelled 2017-08-25
All historical holders
Every license row we've seen with the callsign N4GDO, oldest first.
- RUHL, RICHARD S AL1999-06-30 → cancelled 2000-10-13
- HARPER, SYDNEY S AL2024-05-02 active