Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8SDA callsign genealogy
Currently held by CALDWELL, DAVID 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 W8SDA's current licensee, walking backwards.
- CALDWELL, JOHN POHgranted 2012-04-02cancelled 2019-08-09
Successor callsigns
Callsigns held now by people who previously held W8SDA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8SDA, oldest first.
- CALDWELL, DAVID A OH1996-04-04 → cancelled 2008-04-05
- CALDWELL, JOHN P OH2019-08-09 active