Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4PHS callsign genealogy
Currently held by SCHWAB, CHRISTOPHER 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 KD4PHS's current licensee, walking backwards.
- KN4FPMcancelledPlainview High School Amateur ClubALgranted 2017-08-30cancelled 2017-09-19
Successor callsigns
Callsigns held now by people who previously held KD4PHS.
- SCHWAB, CHRISTOPHER JFLgranted 2018-12-19
All historical holders
Every license row we've seen with the callsign KD4PHS, oldest first.
- Plainview High School Amateur Club AL2017-09-19 active
- SCHWAB, CHRISTOPHER J— → cancelled 1998-11-09