Confidence: Medium · Source: FCC ULS · As of 2026-09-15
KF5TZM callsign genealogy
Currently held by ARMSTRONG, BILLY R
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 KF5TZM'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 KF5TZM.
- ARMSTRONG, BILLY ROKgranted 2014-05-13cancelled 2026-05-14