Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4JRK callsign genealogy
Currently held by CADMAN, RUTH I
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 W4JRK's current licensee, walking backwards.
- Kramer, Jon RFLgranted 2010-07-30cancelled 2010-09-28
Successor callsigns
Callsigns held now by people who previously held W4JRK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4JRK, oldest first.
- CADMAN, RUTH I FL1998-02-06 → cancelled 2010-02-09
- Kramer, Jon R FL2020-07-23 active