Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4BTB callsign genealogy
Currently held by SPENCE, LEWIS C
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 KF4BTB's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KF4BTB.
No current licensee on record previously held this callsign.