Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9AMO callsign genealogy
Currently held by Clark, Randall 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 W9AMO's current licensee, walking backwards.
- Clark, Randall KILgranted 2022-12-30cancelled 2023-01-18
Successor callsigns
Callsigns held now by people who previously held W9AMO.
- Olsen, Aart MILgranted 2020-05-16
All historical holders
Every license row we've seen with the callsign W9AMO, oldest first.
- Olsen, Aart M IL2019-07-23 → cancelled 2020-05-16
- Clark, Randall K IL2023-01-18 active