Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9SBK callsign genealogy
Currently held by SANDERS, JAMES T
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 W9SBK's current licensee, walking backwards.
- Krenkel, Robert WWIgranted 2023-10-06cancelled 2023-11-25
Successor callsigns
Callsigns held now by people who previously held W9SBK.
- Krenkel, Robert WWIgranted 2024-03-29
All historical holders
Every license row we've seen with the callsign W9SBK, oldest first.
- SANDERS, JAMES T IL1988-10-04 → cancelled 2000-10-05
- Krenkel, Robert W WI2023-11-25 → cancelled 2024-03-29