Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4SDS callsign genealogy
Currently held by Crumby, Paul C
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 KJ4SDS's current licensee, walking backwards.
- Crumby, Paul CTNgranted 2016-12-16cancelled 2017-05-16
Successor callsigns
Callsigns held now by people who previously held KJ4SDS.
- CRUMBY, BOBBY JTNgranted 2024-01-23
All historical holders
Every license row we've seen with the callsign KJ4SDS, oldest first.
- CRUMBY JR, BOBBY J TN2010-02-12 → cancelled 2014-03-21
- Crumby, Paul C TN2017-05-16 active