Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA1FSX callsign genealogy
Currently held by KNAPP, KARL H
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 KA1FSX's current licensee, walking backwards.
- KNAPP, KARL HPAgranted 2013-11-27cancelled 2017-06-20
Successor callsigns
Callsigns held now by people who previously held KA1FSX.
- KNAPP, KARL HPAgranted 2013-11-27cancelled 2017-06-20