Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA4SF callsign genealogy
Currently held by Phelps, Robert W
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 AA4SF's current licensee, walking backwards.
- KR4BEGcancelled199 Contest ClubSCgranted 2025-02-07cancelled 2025-02-28
Successor callsigns
Callsigns held now by people who previously held AA4SF.
- AA4Vactive199 Contest ClubSCgranted 2025-09-16
All historical holders
Every license row we've seen with the callsign AA4SF, oldest first.
- Phelps, Robert W VA2008-09-03 → cancelled 2020-11-21
- 199 Contest Club SC2025-02-28 → cancelled 2025-09-16