Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9TZZ callsign genealogy
Currently held by WATTERSON, JEFFREY S
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 K9TZZ's current licensee, walking backwards.
- WATTERSON, JEFFREY SILgranted 2013-01-26cancelled 2014-05-09
Successor callsigns
Callsigns held now by people who previously held K9TZZ.
- Watterson, Jeffrey SILgranted 2016-12-13
All historical holders
Every license row we've seen with the callsign K9TZZ, oldest first.
- RADIO AMATEUR TECHNICAL SOCIETY IL1996-10-08 → cancelled 2008-10-09
- WATTERSON, JEFFREY S IL2014-05-09 → cancelled 2016-12-13