Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3TRF callsign genealogy
Currently held by Frisch, Tim
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 W3TRF's current licensee, walking backwards.
- Frisch, TimMDgranted 2020-02-24cancelled 2020-04-28
Successor callsigns
Callsigns held now by people who previously held W3TRF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3TRF, oldest first.
- Kammerman, Philip E MD2007-04-09 → cancelled 2019-06-25
- Frisch, Tim MD2020-04-28 active