Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3TJM callsign genealogy
Currently held by JOHNSTON, HOWARD 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 K3TJM's current licensee, walking backwards.
- Johnston, John PSCgranted 2014-11-26cancelled 2017-02-11
Successor callsigns
Callsigns held now by people who previously held K3TJM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3TJM, oldest first.
- JOHNSTON, HOWARD J PA1996-08-08 → cancelled 2008-08-09
- Johnston, John P SC2017-02-11 active