Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1APM callsign genealogy
Currently held by Harper, Michael S
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 W1APM's current licensee, walking backwards.
- Harper, Michael SVAgranted 2016-12-16cancelled 2017-02-11
Successor callsigns
Callsigns held now by people who previously held W1APM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1APM, oldest first.
- Motta Jr, Arthur P MA2003-01-07 → cancelled 2015-01-08
- Harper, Michael S TX2017-02-11 active