Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0SDR callsign genealogy
Currently held by Langenhuysen, Robert G
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 W0SDR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W0SDR.
No current licensee on record previously held this callsign.