Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9TPH callsign genealogy
Currently held by Hamm JR, Thomas P
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 N9TPH's current licensee, walking backwards.
- Hamm Jr, Thomas PWIgranted 2011-05-02cancelled 2011-07-09
Successor callsigns
Callsigns held now by people who previously held N9TPH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9TPH, oldest first.
- GRANDAHL, RAYMOND S WI1995-02-08 → cancelled 2005-05-19
- Hamm JR, Thomas P WI2021-06-25 active