Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NM4H callsign genealogy
Currently held by HARRELL, MICHAEL W
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 NM4H's current licensee, walking backwards.
- Williams, John DPAgranted 2020-03-19cancelled 2022-12-31
Successor callsigns
Callsigns held now by people who previously held NM4H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NM4H, oldest first.
- HARRELL, MICHAEL W TN2019-02-07 → cancelled 2020-12-12
- Williams, John TN2022-12-31 active