Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0JAC callsign genealogy
Currently held by Botsford, Jack M
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 W0JAC's current licensee, walking backwards.
- Frederiksen, Jack EMDgranted 2024-08-20cancelled 2024-09-13
Successor callsigns
Callsigns held now by people who previously held W0JAC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0JAC, oldest first.
- Botsford, Jack M SD2009-05-01 → cancelled 2021-07-28
- Frederiksen, Jack E MD2024-09-13 active