Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KS1USA callsign genealogy
Currently held by Probst, Fred S
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 KS1USA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KS1USA.
No current licensee on record previously held this callsign.