Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7SDI callsign genealogy
Currently held by SILLS, WILLIAM A
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 K7SDI's current licensee, walking backwards.
- SILLS, WILLIAM ANVgranted 1999-03-16cancelled 2004-01-03
Successor callsigns
Callsigns held now by people who previously held K7SDI.
- SILLS, WILLIAM AORgranted 2020-09-22