Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4UPJ callsign genealogy
Currently held by Schetrompf, Mark 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 W4UPJ's current licensee, walking backwards.
- Schetrompf, Mark AIDgranted 2014-06-13cancelled 2018-06-01
Successor callsigns
Callsigns held now by people who previously held W4UPJ.
No current licensee on record previously held this callsign.