Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4EMF callsign genealogy
Currently held by Jacobs, Jay S
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 K4EMF's current licensee, walking backwards.
- Jacobs, Jay SGAgranted 2019-04-17cancelled 2019-05-07
Successor callsigns
Callsigns held now by people who previously held K4EMF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4EMF, oldest first.
- Frederick, Edward M TN2005-06-25 → cancelled 2017-06-27
- Jacobs, Jay S GA2019-05-07 active