Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4ZU callsign genealogy
Currently held by Shaeffer, James R
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 AF4ZU's current licensee, walking backwards.
- SHAEFFER, JAMES RTNgranted 1999-06-15cancelled 2000-06-28
Successor callsigns
Callsigns held now by people who previously held AF4ZU.
- Shaeffer, James RKYgranted 2020-07-14