Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1A callsign genealogy
Currently held by Christeson, Michael
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 AB1A's current licensee, walking backwards.
- Christeson, MichaelPAgranted 2016-11-21cancelled 2018-05-15
Successor callsigns
Callsigns held now by people who previously held AB1A.
- FERRY, RICHARD DMAgranted 2026-02-07
All historical holders
Every license row we've seen with the callsign AB1A, oldest first.
- FERRY, RICHARD D MA2008-10-23 → cancelled 2016-04-26
- Christeson, Michael PA2018-05-15 active