Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1SZK callsign genealogy
Currently held by MARSHALL, FRED L
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 K1SZK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K1SZK.
No current licensee on record previously held this callsign.