Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9OLO callsign genealogy
Currently held by Gjelsten, Glenn 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 W9OLO's current licensee, walking backwards.
- Olfsson, Thomas JILgranted 2016-08-18cancelled 2016-09-17
Successor callsigns
Callsigns held now by people who previously held W9OLO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9OLO, oldest first.
- Gjelsten, Glenn R FL2002-02-28 → cancelled 2014-03-01
- Olofsson, Thomas J IL2016-09-17 active