Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3JDH callsign genealogy
Currently held by Markowski, 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 KB3JDH's current licensee, walking backwards.
- Holloway, J DavidPAgranted 2007-10-04cancelled 2007-10-23
Successor callsigns
Callsigns held now by people who previously held KB3JDH.
All historical holders
Every license row we've seen with the callsign KB3JDH, oldest first.
- Markowski, Michael J PA2003-01-27 → cancelled 2003-03-19
- Holloway, J David PA2007-10-23 → cancelled 2009-03-27