Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF5O callsign genealogy
Currently held by Martin, Cyril V
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 AF5O's current licensee, walking backwards.
- Vaughan, Christopher BTXgranted 2009-01-27cancelled 2011-05-13
Successor callsigns
Callsigns held now by people who previously held AF5O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AF5O, oldest first.
- COX, LINDA F OK1988-09-27 → cancelled 2000-09-28
- Martin, Cyril V TX2001-03-20 → cancelled 2009-04-24
- Vaughan, Christopher B TX2023-04-18 active