Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SPU callsign genealogy
Currently held by Unruh, Samuel 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 K0SPU's current licensee, walking backwards.
- Unruh, Samuel PNDgranted 2019-03-07cancelled 2019-03-30
Successor callsigns
Callsigns held now by people who previously held K0SPU.
No current licensee on record previously held this callsign.