Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1TMM callsign genealogy
Currently held by MC DONALD, THOMAS M
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 K1TMM's current licensee, walking backwards.
- MC DONALD, THOMAS MCTgranted 2001-07-25cancelled 2006-10-17
Successor callsigns
Callsigns held now by people who previously held K1TMM.
- HERRICK, BRUCE DMEgranted 2021-08-17