Confidence: Medium · Source: FCC ULS · As of 2026-10-24
WA4JSD callsign genealogy
Currently held by WILHELM JR, MARTIN 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 WA4JSD's current licensee, walking backwards.
- GRISHAM, SHIRLEY JKYgranted 2026-09-05cancelled 2026-09-26
Successor callsigns
Callsigns held now by people who previously held WA4JSD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4JSD, oldest first.
- WILHELM JR, MARTIN A CO1988-02-16 → cancelled 2000-02-17
- GRISHAM, SHIRLEY J KY2026-09-26 active