Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD5K callsign genealogy
Currently held by PETTYJOHN, MICHAEL R
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 AD5K's current licensee, walking backwards.
- Tschirhart, JamesWAgranted 2026-06-05cancelled 2026-08-04
Successor callsigns
Callsigns held now by people who previously held AD5K.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD5K, oldest first.
- PETTYJOHN, MICHAEL R TX2014-04-30 → cancelled 2026-07-16
- Tschirhart, James WA2026-08-04 active