Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1SGW callsign genealogy
Currently held by Tharp, Calvin 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 K1SGW's current licensee, walking backwards.
- Tharp, Calvin JMIgranted 2016-08-29cancelled 2017-04-28
Successor callsigns
Callsigns held now by people who previously held K1SGW.
No current licensee on record previously held this callsign.