Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N7KK callsign genealogy
Currently held by Koller, Karl
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 N7KK's current licensee, walking backwards.
- Tschannen, John MWAgranted 2015-07-24cancelled 2019-03-16
Successor callsigns
Callsigns held now by people who previously held N7KK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7KK, oldest first.
- Koller, Karl AZ2006-11-28 → cancelled 2019-02-26
- Tschannen, John M WA2019-03-16 active