Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1MTK callsign genealogy
Currently held by PICKERING, KENNETH 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 K1MTK's current licensee, walking backwards.
- Koszewski, Martin TMAgranted 2015-03-20cancelled 2015-04-07
Successor callsigns
Callsigns held now by people who previously held K1MTK.
- Koszewski, Martin TMAgranted 2026-09-11
All historical holders
Every license row we've seen with the callsign K1MTK, oldest first.
- PICKERING, KENNETH S MA1988-04-26 → cancelled 2000-04-27
- Koszewski, Martin T MA2015-04-07 → cancelled 2016-11-04