Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4RG callsign genealogy
Currently held by GRUBB, ROBERT E
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 KF4RG's current licensee, walking backwards.
- GRUBB, ROBERT ETNgranted 2009-07-02cancelled 2015-11-28
Successor callsigns
Callsigns held now by people who previously held KF4RG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4RG, oldest first.
- DONATO, SAM J FL1997-07-29 → cancelled 2009-07-30
- GRUBB, ROBERT E TN2015-11-28 active