Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7CAT callsign genealogy
Currently held by DETTMER, MICHAEL L
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 W7CAT's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W7CAT.
- AI7BactiveTHREE RIVERS CONTEST CLUBORgranted 2018-09-11
All historical holders
Every license row we've seen with the callsign W7CAT, oldest first.
- DETTMER, MICHAEL L WY2020-11-04 active
- WRUBLE, ROBERT S— → cancelled 1998-11-24