Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K7MJO callsign genealogy
Currently held by O Connell, Michael 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 K7MJO's current licensee, walking backwards.
- O Connell, Michael JWAgranted 2007-03-29cancelled 2007-06-08
Successor callsigns
Callsigns held now by people who previously held K7MJO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7MJO, oldest first.
- OPPENHEIMER, MARTIN J AZ1997-10-15 → cancelled 1999-07-26
- O Connell, Michael J WA2017-03-14 active