Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K3JMJ callsign genealogy
Currently held by Niemand, Jacob R
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 K3JMJ's current licensee, walking backwards.
- Troelsch Jr, Steven BPAgranted 2021-12-16cancelled 2022-01-05
Successor callsigns
Callsigns held now by people who previously held K3JMJ.
- NIEMAND, JACOB RMNgranted 2026-07-03
All historical holders
Every license row we've seen with the callsign K3JMJ, oldest first.
- Niemand, Jacob R MN2007-06-12 → cancelled 2016-08-05
- Troelsch Jr, Steven B PA2022-01-05 active