Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN4BTF callsign genealogy
Currently held by Krahm, David J
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 KN4BTF's current licensee, walking backwards.
- Krahm, David JFLgranted 2012-03-30cancelled 2017-03-15
Successor callsigns
Callsigns held now by people who previously held KN4BTF.
- Krahm, David JFLgranted 2023-01-25