Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9JAC callsign genealogy
Currently held by RESPASS, TOBIAS
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 KB9JAC's current licensee, walking backwards.
- Jacobs, Michael KINgranted 2007-12-14cancelled 2008-01-04
Successor callsigns
Callsigns held now by people who previously held KB9JAC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9JAC, oldest first.
- RESPASS, TOBIAS IL1994-07-15 → cancelled 2006-07-18
- Jacobs, Michael K IN2017-12-28 active