Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0JUM callsign genealogy
Currently held by Frederick, Ryan 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 KD0JUM's current licensee, walking backwards.
- Frederick, Ryan MCOgranted 2001-08-02cancelled 2009-12-29
Successor callsigns
Callsigns held now by people who previously held KD0JUM.
- Frederick, RyanWAgranted 2019-10-19cancelled 2022-07-19