Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SDA callsign genealogy
Currently held by JANGULA, JOHN M
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 N4SDA's current licensee, walking backwards.
- Arendall, Stanley DALgranted 2013-02-21cancelled 2016-02-23
Successor callsigns
Callsigns held now by people who previously held N4SDA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SDA, oldest first.
- JANGULA, JOHN M CA1988-04-12 → cancelled 2000-04-13
- Arendall, Stanley D AL2016-02-23 active