Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9MDX callsign genealogy
Currently held by ROBISON, LARRY J
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 W9MDX's current licensee, walking backwards.
- COX, THOMAS MILgranted 2024-08-21cancelled 2024-09-10
Successor callsigns
Callsigns held now by people who previously held W9MDX.
- ROBISON, LARRY JOHgranted 2021-01-19
- Dean, Matt TNVgranted 2019-07-12cancelled 2019-12-17
- ROBISON, LARRY JOHgranted 2014-07-11cancelled 2020-03-07
- ROBISON, LARRY JOHgranted 2003-11-14cancelled 2004-05-22
- ROBISON, LARRY JOHgranted 2000-06-30cancelled 2000-11-21
All historical holders
Every license row we've seen with the callsign W9MDX, oldest first.
- ROBISON, LARRY J OH1992-02-11 → cancelled 2000-06-30
- ROBISON, LARRY J OH2000-11-21 → cancelled 2003-11-14
- ROBISON, LARRY J OH2013-04-12 → cancelled 2014-07-11
- Dean, Matthew T NV2019-06-11 → cancelled 2019-07-12
- ROBISON, LARRY J OH2020-03-07 → cancelled 2021-01-19
- COX, THOMAS M IL2024-09-10 active