Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NJ0K callsign genealogy
Currently held by HEIER, RONALD A
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 NJ0K's current licensee, walking backwards.
- Roehrs, HolgerFLgranted 2016-10-14cancelled 2017-02-14
Successor callsigns
Callsigns held now by people who previously held NJ0K.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NJ0K, oldest first.
- HEIER, RONALD A CA2004-12-10 → cancelled 2017-01-27
- Roehrs, Holger MA2017-02-14 active