Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0SYH callsign genealogy
Currently held by Irwin, David 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 KD0SYH's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KD0SYH.
- Irwin, David CCOgranted 2012-10-27cancelled 2024-11-30