Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0TBT callsign genealogy
Currently held by Schaller, Karl P
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 K0TBT's current licensee, walking backwards.
- Schaller, Karl PMNgranted 2001-08-28cancelled 2002-04-23
Successor callsigns
Callsigns held now by people who previously held K0TBT.
No current licensee on record previously held this callsign.