Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA9TDX callsign genealogy
Currently held by JACOBSON, FRANK S
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 KA9TDX's current licensee, walking backwards.
- Jacobson, Frank SWAgranted 2018-11-08cancelled 2018-12-04
Successor callsigns
Callsigns held now by people who previously held KA9TDX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA9TDX, oldest first.
- JACOBSON, FRANK S WA1993-02-09 → cancelled 2005-02-10
- Jacobson, Frank S FL2018-12-04 active