Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KJ4FBY callsign genealogy
Currently held by Marquardt Jr, Richard J
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 KJ4FBY's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KJ4FBY.
- MARQUARDT JR, RICHARD JVAgranted 2018-06-29