Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JO callsign genealogy
Currently held by OLSON, JAMES E
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 W4JO's current licensee, walking backwards.
- KJ6RGMcancelledW4JO RADIO CLUBCAgranted 2011-09-21cancelled 2011-10-15
Successor callsigns
Callsigns held now by people who previously held W4JO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4JO, oldest first.
- OLSON, JAMES E GA2006-09-08 → cancelled 2010-07-08
- W4JO RADIO CLUB CA2021-09-21 active