Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD7SBL callsign genealogy
Currently held by MACDONALD, ROBERT 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 KD7SBL's current licensee, walking backwards.
- Macdonald, Robert JORgranted 2015-01-23cancelled 2015-04-10
Successor callsigns
Callsigns held now by people who previously held KD7SBL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD7SBL, oldest first.
- MACDONALD, ROBERT J TN2002-07-09 → cancelled 2014-07-10
- Macdonald, Robert J OR2025-04-29 active