Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W0TBD callsign genealogy
Currently held by Harlow, Joshua G
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 W0TBD's current licensee, walking backwards.
- Harlow, Joshua GCOgranted 2009-06-02cancelled 2017-02-04
Successor callsigns
Callsigns held now by people who previously held W0TBD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0TBD, oldest first.
- SWANSON, WARNER R MN1988-03-15 → cancelled 2000-03-16
- Harlow, Joshua G CO2017-02-04 active