Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3DLH callsign genealogy
Currently held by HARBAUGH, DAVID L
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 W3DLH's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W3DLH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3DLH, oldest first.
- Horst, Donald L PA2008-04-25 → cancelled 2020-04-28
- HARBAUGH, DAVID L MD2023-06-22 active