Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4SW callsign genealogy
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 KM4SW's current licensee, walking backwards.
- KM4IDUcancelledCarolina Side WindersSCgranted 2015-02-24cancelled 2015-03-31
Successor callsigns
Callsigns held now by people who previously held KM4SW.
- PATTERSON, FREDERICK KNYgranted 1998-09-03cancelled 2010-09-04
All historical holders
Every license row we've seen with the callsign KM4SW, oldest first.
- Carolina Sidewinders of The Lowcountry SC2015-03-31 active
- —— → cancelled 1998-09-03