Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K8RTM callsign genealogy
Currently held by HEINTZELMAN, ROBERT 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 K8RTM's current licensee, walking backwards.
- Moore, John HMIgranted 2017-05-19cancelled 2017-06-13
Successor callsigns
Callsigns held now by people who previously held K8RTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8RTM, oldest first.
- HEINTZELMAN, ROBERT L MI1994-07-08 → cancelled 2006-07-11
- Moore, John H MI2017-06-13 active