Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N3MDH callsign genealogy
Currently held by HEISE, MARK D
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 N3MDH's current licensee, walking backwards.
- HEISE, MARK DPAgranted 2015-07-10cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held N3MDH.
- SARRAF III, SAMUEL HPAgranted 2023-04-26