Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1ZHU callsign genealogy
Currently held by Baldrate, Karl
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 W1ZHU's current licensee, walking backwards.
- Baldrate, KarlMAgranted 2012-09-21cancelled 2012-10-19
Successor callsigns
Callsigns held now by people who previously held W1ZHU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1ZHU, oldest first.
- BALDRATE, JOSEPH MA2004-07-14 → cancelled 2011-12-04
- Baldrate, Karl MA2022-10-12 active