Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N7NDH callsign genealogy
Currently held by DUPLEX, WILLIAM C
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 N7NDH's current licensee, walking backwards.
- HAMACK, ANDREW WWAgranted 2014-10-29cancelled 2018-02-06
Successor callsigns
Callsigns held now by people who previously held N7NDH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7NDH, oldest first.
- DUPLEX, WILLIAM C WA1989-07-03 → cancelled 2001-07-04
- HAMACK, ANDREW W WA2018-02-06 active