Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1CTM callsign genealogy
Currently held by Diehl Sr, Robert H
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 N1CTM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N1CTM.
No current licensee on record previously held this callsign.