Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N7DLO callsign genealogy
Currently held by Osborne, Donald 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 N7DLO's current licensee, walking backwards.
- Osborne, Donald LAZgranted 2011-05-13cancelled 2019-08-27
Successor callsigns
Callsigns held now by people who previously held N7DLO.
- HORSTMAN, GERALD RWAgranted 2016-03-18
All historical holders
Every license row we've seen with the callsign N7DLO, oldest first.
- HORSTMAN, GERALD R WA2007-10-03 → cancelled 2016-03-18
- Osborne, Donald L AZ2019-08-27 active