Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3JU callsign genealogy
Currently held by UNDERWOOD, JOSEPH H
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 W3JU's current licensee, walking backwards.
- UNDERWOOD, JOSEPH HNYgranted 1994-04-26cancelled 2000-07-26
Successor callsigns
Callsigns held now by people who previously held W3JU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3JU, oldest first.
- MAYER, ROBERT PA1987-09-01 → cancelled 1999-09-02
- UNDERWOOD, JOSEPH H NY2020-07-01 active