Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7SDP callsign genealogy
Currently held by Jackson, John 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 W7SDP's current licensee, walking backwards.
- Jackson, John JORgranted 2002-07-17cancelled 2012-02-28
Successor callsigns
Callsigns held now by people who previously held W7SDP.
No current licensee on record previously held this callsign.