Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA4JSM callsign genealogy
Currently held by MARLOW, JOSEPH 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 KA4JSM's current licensee, walking backwards.
- MARLOW, JOSEPH SNCgranted 2019-03-11cancelled 2019-04-05
Successor callsigns
Callsigns held now by people who previously held KA4JSM.
No current licensee on record previously held this callsign.