Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SDW callsign genealogy
Currently held by SPERL, FRANK J
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 K4SDW's current licensee, walking backwards.
- West, Stanley DSCgranted 2007-04-19cancelled 2010-04-30
Successor callsigns
Callsigns held now by people who previously held K4SDW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SDW, oldest first.
- SPERL, FRANK J FL1997-10-16 → cancelled 2008-08-13
- West, Stanley D SC2020-02-04 active