Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NA5O callsign genealogy
Currently held by WALKER, JAMES D
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 NA5O's current licensee, walking backwards.
- WALKER, JAMES DOKgranted 2006-10-30cancelled 2014-03-28
Successor callsigns
Callsigns held now by people who previously held NA5O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NA5O, oldest first.
- WHARTON, WILLIAM H LA1997-03-04 → cancelled 2009-03-05
- Oklahoma Contesting Group OK2009-03-24 → cancelled 2012-03-07
- WALKER, JAMES D OK2024-07-24 active