Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4TJM callsign genealogy
Currently held by MONROE, THOMAS 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 K4TJM's current licensee, walking backwards.
- Martin, Timothy JALgranted 2008-02-13cancelled 2010-12-21
Successor callsigns
Callsigns held now by people who previously held K4TJM.
- MONROE, THOMAS JNEgranted 2008-03-01cancelled 2011-08-16
All historical holders
Every license row we've seen with the callsign K4TJM, oldest first.
- MONROE, THOMAS J FL1999-07-01 → cancelled 2008-03-01
- Martin, Timothy J AL2020-11-18 active