Confidence: Medium · Source: FCC ULS · As of 2026-09-15
KJ4YTD callsign genealogy
Currently held by Crosby, Matthew 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 KJ4YTD's current licensee, walking backwards.
- Crosby, Matthew LFLgranted 2010-07-07cancelled 2010-10-13
Successor callsigns
Callsigns held now by people who previously held KJ4YTD.
- Crosby, Matthew LFLgranted 2022-03-29