Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3PSU callsign genealogy
Currently held by Frederick, Michael C
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 KB3PSU's current licensee, walking backwards.
- Frederick, Michael CPAgranted 2014-05-19cancelled 2014-06-06
Successor callsigns
Callsigns held now by people who previously held KB3PSU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB3PSU, oldest first.
- Mohamed, Ammar H PA2001-03-20 → cancelled 2013-03-21
- Frederick, Michael C PA2024-05-18 active