Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7GSF callsign genealogy
Currently held by Martell, John B
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 K7GSF's current licensee, walking backwards.
- Martell, John BAZgranted 2011-05-23cancelled 2011-06-18
Successor callsigns
Callsigns held now by people who previously held K7GSF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7GSF, oldest first.
- STARK, JOSEPH J WA1996-02-05 → cancelled 2008-02-06
- Martell, John B OH2021-11-02 active