Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W5YDX callsign genealogy
Currently held by KOLLER, ALEXANDER
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 W5YDX's current licensee, walking backwards.
- Koller, AlexanderTXgranted 1999-11-23cancelled 2007-04-10
Successor callsigns
Callsigns held now by people who previously held W5YDX.
No current licensee on record previously held this callsign.