Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TSD callsign genealogy
Currently held by CATHCART, BRIAN J
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 W4TSD's current licensee, walking backwards.
- CATHCART, BRIAN JFLgranted 2014-05-17cancelled 2017-05-19
Successor callsigns
Callsigns held now by people who previously held W4TSD.
No current licensee on record previously held this callsign.