Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SF callsign genealogy
Currently held by JOHNSON, HARRY H
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 W1SF's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W1SF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1SF, oldest first.
- JOHNSON, HARRY H CT1996-06-05 → cancelled 1999-07-25
- Forman, Stuart A MA2023-11-17 active