Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB5RSM callsign genealogy
Currently held by FIELDER, JAMES W
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 KB5RSM's current licensee, walking backwards.
- McMahan, Robert STXgranted 2018-10-09cancelled 2018-10-30
Successor callsigns
Callsigns held now by people who previously held KB5RSM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB5RSM, oldest first.
- FIELDER, JAMES W TX1992-04-21 → cancelled 2004-04-22
- McMahan, Robert S TX2018-10-30 active