Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9TMW callsign genealogy
Currently held by JOHNSTON, DONALD L
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 K9TMW's current licensee, walking backwards.
- Weskamp, MarcosCAgranted 2013-08-22cancelled 2017-08-08
Successor callsigns
Callsigns held now by people who previously held K9TMW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9TMW, oldest first.
- JOHNSTON, DONALD L IL1996-12-13 → cancelled 2008-07-25
- Weskamp, Marcos CA2017-08-08 active