Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4TZI callsign genealogy
Currently held by ROBERSON, FREDERICK 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 KF4TZI'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 KF4TZI.
- W4MRFactiveROTTEN RADIO AMATEUR RADIO CLUBKYgranted 2017-07-25