Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3BTR callsign genealogy
Currently held by ARNOLD SR, JOHN J
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 K3BTR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K3BTR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3BTR, oldest first.
- ARNOLD SR, JOHN J PA1988-09-27 → cancelled 2000-09-28
- Thompson, Bret R MD2016-11-04 active