Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N3GSK callsign genealogy
Currently held by GRIMM, PHILIP F
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 N3GSK's current licensee, walking backwards.
- Grimm, Philip FILgranted 2005-06-30cancelled 2005-07-23
Successor callsigns
Callsigns held now by people who previously held N3GSK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N3GSK, oldest first.
- GRIMM, PHILIP F MD1988-12-27 → cancelled 2000-12-28
- Grimm, Philip F IL2005-07-23 → cancelled 2017-07-25