Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3SDZ callsign genealogy
Currently held by Schuler, Michael A
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 KB3SDZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KB3SDZ.
- Schuler, Michael APAgranted 2010-05-15cancelled 2010-10-09
All historical holders
Every license row we've seen with the callsign KB3SDZ, oldest first.
- Schuler, Michael A PA2008-12-29 → cancelled 2010-05-15
- Schuler, Michael A PA2022-07-13 active