Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7RDR callsign genealogy
Currently held by BUTLER, BUD L
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 K7RDR's current licensee, walking backwards.
- Renfro, DianaIDgranted 2021-03-11cancelled 2021-08-31
Successor callsigns
Callsigns held now by people who previously held K7RDR.
- Zercie, Jeffrey WCTgranted 2022-09-02
All historical holders
Every license row we've seen with the callsign K7RDR, oldest first.
- BUTLER, BUD L UT2000-08-11 → cancelled 2012-08-14
- Zercie, Jeffrey W AK2012-08-31 → cancelled 2012-10-19
- Renfro, Diana ID2021-08-31 active