Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9KCM callsign genealogy
Currently held by Heller, Jerome
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 K9KCM's current licensee, walking backwards.
- Wolfson, Roger DWAgranted 2015-07-31cancelled 2020-09-05
Successor callsigns
Callsigns held now by people who previously held K9KCM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9KCM, oldest first.
- HELLER, CALVIN S IL1991-05-07 → cancelled 2003-05-08
- Heller, Jerome WI2019-05-23 → cancelled 2020-04-14
- Wolfson, Roger D WA2020-09-05 active