Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W6TUW callsign genealogy
Currently held by Santa Cruz ACS Club
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 W6TUW's current licensee, walking backwards.
- KI6PIUcancelledSanta Cruz ACS ClubCAgranted 2008-03-25cancelled 2008-04-22
Successor callsigns
Callsigns held now by people who previously held W6TUW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6TUW, oldest first.
- HARBAUGH, DAVID E CA1995-06-12 → cancelled 2007-06-13
- Santa Cruz ACS Club CA2018-02-05 active