Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD9DX callsign genealogy
Currently held by PREBLE, JON R
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 AD9DX's current licensee, walking backwards.
- PREBLE, JON RINgranted 2011-02-23cancelled 2012-07-17
Successor callsigns
Callsigns held now by people who previously held AD9DX.
- Sanborn III, Lyman Scott HCAgranted 2007-02-13cancelled 2014-02-28
All historical holders
Every license row we've seen with the callsign AD9DX, oldest first.
- Sanborn III, Lyman Scott H CA2004-08-27 → cancelled 2007-02-13
- PREBLE, JON R IN2022-06-28 active