Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4GRV callsign genealogy
Currently held by MARTHA, MICHAEL K
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 W4GRV's current licensee, walking backwards.
- MARTHA, MICHAEL KTNgranted 2001-10-10cancelled 2002-06-18
Successor callsigns
Callsigns held now by people who previously held W4GRV.
No current licensee on record previously held this callsign.