Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1O callsign genealogy
Currently held by Locke, Jeffery K
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 AB1O's current licensee, walking backwards.
- Locke, Jeffery KNHgranted 2011-10-20cancelled 2011-12-06
Successor callsigns
Callsigns held now by people who previously held AB1O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB1O, oldest first.
- OLMSTED SR, RICHARD W NH2001-08-22 → cancelled 2009-11-04
- Locke, Jeffery K NH2022-04-05 active