Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SDR callsign genealogy
Currently held by REED, RUSSELL F
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 K4SDR's current licensee, walking backwards.
- BECKER, DEAN RFLgranted 2018-05-14cancelled 2019-10-25
Successor callsigns
Callsigns held now by people who previously held K4SDR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SDR, oldest first.
- REED, RUSSELL F WA2007-07-11 → cancelled 2019-10-08
- BECKER, DEAN R FL2019-10-25 active