Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD7CTR callsign genealogy
Currently held by Olson, Jeffrey A
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 KD7CTR's current licensee, walking backwards.
- Olson, Jeffrey AORgranted 2016-10-14cancelled 2016-11-08
Successor callsigns
Callsigns held now by people who previously held KD7CTR.
- HEWITT, JEFFREY MWAgranted 2018-07-24
All historical holders
Every license row we've seen with the callsign KD7CTR, oldest first.
- HEWITT, JEFFREY M WA2008-09-05 → cancelled 2010-06-10
- Olson, Jeffrey A OR2016-11-08 active